The kernel packages contain the Linux kernel, the core of any Linux operating system.

This update fixes the following security issues :

  - IPv6 fragment identification value generation could     allow a remote attacker to disrupt a target system's     networking, preventing legitimate users from accessing     its services. (CVE-2011-2699, Important)

  - A signedness issue was found in the Linux kernel's CIFS     (Common Internet File System) implementation. A     malicious CIFS server could send a specially crafted     response to a directory read request that would result     in a denial of service or privilege escalation on a     system that has a CIFS share mounted. (CVE-2011-3191,     Important)

  - A flaw was found in the way the Linux kernel handled     fragmented IPv6 UDP datagrams over the bridge with UDP     Fragmentation Offload (UFO) functionality on. A remote     attacker could use this flaw to cause a denial of     service. (CVE-2011-4326, Important)

  - The way IPv4 and IPv6 protocol sequence numbers and     fragment IDs were generated could allow a     man-in-the-middle attacker to inject packets and     possibly hijack connections. Protocol sequence numbers     and fragment IDs are now more random. (CVE-2011-3188,     Moderate)

  - A buffer overflow flaw was found in the Linux kernel's     FUSE (Filesystem in Userspace) implementation. A local     user in the fuse group who has access to mount a FUSE     file system could use this flaw to cause a denial of     service. (CVE-2011-3353, Moderate)

  - A flaw was found in the b43 driver in the Linux kernel.
    If a system had an active wireless interface that uses     the b43 driver, an attacker able to send a specially     crafted frame to that interface could cause a denial of     service. (CVE-2011-3359, Moderate)

  - A flaw was found in the way CIFS shares with DFS     referrals at their root were handled. An attacker on the     local network who is able to deploy a malicious CIFS     server could create a CIFS network share that, when     mounted, would cause the client system to crash.
    (CVE-2011-3363, Moderate)

  - A flaw was found in the way the Linux kernel handled     VLAN 0 frames with the priority tag set. When using     certain network drivers, an attacker on the local     network could use this flaw to cause a denial of     service. (CVE-2011-3593, Moderate)

  - A flaw in the way memory containing security-related     data was handled in tpm_read() could allow a local,     unprivileged user to read the results of a previously     run TPM command. (CVE-2011-1162, Low)

  - A heap overflow flaw was found in the Linux kernel's EFI     GUID Partition Table (GPT) implementation. A local     attacker could use this flaw to cause a denial of     service by mounting a disk that contains specially     crafted partition tables. (CVE-2011-1577, Low)

  - The I/O statistics from the taskstats subsystem could be     read without any restrictions. A local, unprivileged     user could use this flaw to gather confidential     information, such as the length of a password used in a     process. (CVE-2011-2494, Low)

  - It was found that the perf tool, a part of the Linux     kernel's Performance Events implementation, could load     its configuration file from the current working     directory. If a local user with access to the perf tool     were tricked into running perf in a directory that     contains a specially crafted configuration file, it     could cause perf to overwrite arbitrary files and     directories accessible to that user. (CVE-2011-2905,     Low)

This update also fixes various bugs.

IPv6 fragment identification value generation could allow a remote attacker to disrupt a target system's networking, preventing legitimate users from accessing its services. (CVE-2011-2699 , Important)

A signedness issue was found in the Linux kernel's CIFS (Common Internet File System) implementation. A malicious CIFS server could send a specially crafted response to a directory read request that would result in a denial of service or privilege escalation on a system that has a CIFS share mounted. (CVE-2011-3191 , Important)

A flaw was found in the way the Linux kernel handled fragmented IPv6 UDP datagrams over the bridge with UDP Fragmentation Offload (UFO) functionality on. A remote attacker could use this flaw to cause a denial of service. (CVE-2011-4326 , Important)

The way IPv4 and IPv6 protocol sequence numbers and fragment IDs were generated could allow a man-in-the-middle attacker to inject packets and possibly hijack connections. Protocol sequence numbers and fragment IDs are now more random. (CVE-2011-3188 , Moderate)

A buffer overflow flaw was found in the Linux kernel's FUSE (Filesystem in Userspace) implementation. A local user in the fuse group who has access to mount a FUSE file system could use this flaw to cause a denial of service. (CVE-2011-3353 , Moderate)

A flaw was found in the b43 driver in the Linux kernel. If a system had an active wireless interface that uses the b43 driver, an attacker able to send a specially crafted frame to that interface could cause a denial of service. (CVE-2011-3359 , Moderate)

A flaw was found in the way CIFS shares with DFS referrals at their root were handled. An attacker on the local network who is able to deploy a malicious CIFS server could create a CIFS network share that, when mounted, would cause the client system to crash. (CVE-2011-3363 , Moderate)

A flaw was found in the way the Linux kernel handled VLAN 0 frames with the priority tag set. When using certain network drivers, an attacker on the local network could use this flaw to cause a denial of service. (CVE-2011-3593 , Moderate)

A flaw in the way memory containing security-related data was handled in tpm_read() could allow a local, unprivileged user to read the results of a previously run TPM command. (CVE-2011-1162 , Low)

A heap overflow flaw was found in the Linux kernel's EFI GUID Partition Table (GPT) implementation. A local attacker could use this flaw to cause a denial of service by mounting a disk that contains specially crafted partition tables. (CVE-2011-1577 , Low)

The I/O statistics from the taskstats subsystem could be read without any restrictions. A local, unprivileged user could use this flaw to gather confidential information, such as the length of a password used in a process. (CVE-2011-2494 , Low)

It was found that the perf tool, a part of the Linux kernel's Performance Events implementation, could load its configuration file from the current working directory. If a local user with access to the perf tool were tricked into running perf in a directory that contains a specially crafted configuration file, it could cause perf to overwrite arbitrary files and directories accessible to that user.
(CVE-2011-2905 , Low)

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2011-2033 advisory.

  - The tpm_read function in the Linux kernel 2.6 does not properly clear memory, which might allow local     users to read the results of the previous TPM command. (CVE-2011-1162)

  - Heap-based buffer overflow in the is_gpt_valid function in fs/partitions/efi.c in the Linux kernel 2.6.38     and earlier allows physically proximate attackers to cause a denial of service (OOPS) or possibly have     unspecified other impact via a crafted size of the EFI GUID partition-table header on removable media.
    (CVE-2011-1577)

  - kernel/taskstats.c in the Linux kernel before 3.1 allows local users to obtain sensitive I/O statistics by     sending taskstats commands to a netlink socket, as demonstrated by discovering the length of another     user's password. (CVE-2011-2494)

  - The IPv6 implementation in the Linux kernel before 3.1 does not generate Fragment Identification values     separately for each destination, which makes it easier for remote attackers to cause a denial of service     (disrupted networking) by predicting these values and sending crafted packets. (CVE-2011-2699)

  - The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to     generate sequence numbers and Fragment Identification values, which makes it easier for remote attackers     to cause a denial of service (disrupted networking) or hijack network sessions by predicting these values     and sending crafted packets. (CVE-2011-3188)

  - Integer signedness error in the CIFSFindNext function in fs/cifs/cifssmb.c in the Linux kernel before 3.1     allows remote CIFS servers to cause a denial of service (memory corruption) or possibly have unspecified     other impact via a large length value in a response to a read request for a directory. (CVE-2011-3191)

  - Buffer overflow in the fuse_notify_inval_entry function in fs/fuse/dev.c in the Linux kernel before 3.1     allows local users to cause a denial of service (BUG_ON and system crash) by leveraging the ability to     mount a FUSE filesystem. (CVE-2011-3353)

  - A certain Red Hat patch to the vlan_hwaccel_do_receive function in net/8021q/vlan_core.c in the Linux     kernel 2.6.32 on Red Hat Enterprise Linux (RHEL) 6 allows remote attackers to cause a denial of service     (system crash) via priority-tagged VLAN frames. (CVE-2011-3593)

  - The udp6_ufo_fragment function in net/ipv6/udp.c in the Linux kernel before 2.6.39, when a certain UDP     Fragmentation Offload (UFO) configuration is enabled, allows remote attackers to cause a denial of service     (system crash) by sending fragmented IPv6 UDP packets to a bridge device. (CVE-2011-4326)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Ryan Sweat discovered that the kernel incorrectly handled certain VLAN packets. On some systems, a remote attacker could send specially crafted traffic to crash the system, leading to a denial of service.
(CVE-2011-1576)

Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not correctly check the origin of mount points. A local attacker could exploit this to trick the system into unmounting arbitrary mount points, leading to a denial of service. (CVE-2011-1833)

Vasiliy Kulikov discovered that taskstats did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2494)

Vasiliy Kulikov discovered that /proc/PID/io did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2495)

Dan Rosenberg discovered that the Bluetooth stack incorrectly handled certain L2CAP requests. If a system was using Bluetooth, a remote attacker could send specially crafted traffic to crash the system or gain root privileges. (CVE-2011-2497)

It was discovered that the EXT4 filesystem contained multiple off-by-one flaws. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2695)

Fernando Gont discovered that the IPv6 stack used predictable fragment identification numbers. A remote attacker could exploit this to exhaust network resources, leading to a denial of service.
(CVE-2011-2699)

Christian Ohm discovered that the perf command looks for configuration files in the current directory. If a privileged user were tricked into running perf in a directory containing a malicious configuration file, an attacker could run arbitrary commands and possibly gain privileges.
(CVE-2011-2905)

Time Warns discovered that long symlinks were incorrectly handled on Be filesystems. A local attacker could exploit this with a malformed Be filesystem and crash the system, leading to a denial of service.
(CVE-2011-2928)

Dan Kaminsky discovered that the kernel incorrectly handled random sequence number generation. An attacker could use this flaw to possibly predict sequence numbers and inject packets. (CVE-2011-3188)

Darren Lavender discovered that the CIFS client incorrectly handled certain large values. A remote attacker with a malicious server could exploit this to crash the system or possibly execute arbitrary code as the root user. (CVE-2011-3191)

Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user who can mount a FUSE file system could cause a denial of service.
(CVE-2011-3353)

Gideon Naim discovered a flaw in the Linux kernel's handling VLAN 0 frames. An attacker on the local network could exploit this flaw to cause a denial of service. (CVE-2011-3593).

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2011-1465 advisory.

  - The tpm_read function in the Linux kernel 2.6 does not properly clear memory, which might allow local     users to read the results of the previous TPM command. (CVE-2011-1162)

  - Heap-based buffer overflow in the is_gpt_valid function in fs/partitions/efi.c in the Linux kernel 2.6.38     and earlier allows physically proximate attackers to cause a denial of service (OOPS) or possibly have     unspecified other impact via a crafted size of the EFI GUID partition-table header on removable media.
    (CVE-2011-1577)

  - kernel/taskstats.c in the Linux kernel before 3.1 allows local users to obtain sensitive I/O statistics by     sending taskstats commands to a netlink socket, as demonstrated by discovering the length of another     user's password. (CVE-2011-2494)

  - The IPv6 implementation in the Linux kernel before 3.1 does not generate Fragment Identification values     separately for each destination, which makes it easier for remote attackers to cause a denial of service     (disrupted networking) by predicting these values and sending crafted packets. (CVE-2011-2699)

  - Untrusted search path vulnerability in the perf_config function in tools/perf/util/config.c in perf, as     distributed in the Linux kernel before 3.1, allows local users to overwrite arbitrary files via a crafted     config file in the current working directory. (CVE-2011-2905)

  - The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to     generate sequence numbers and Fragment Identification values, which makes it easier for remote attackers     to cause a denial of service (disrupted networking) or hijack network sessions by predicting these values     and sending crafted packets. (CVE-2011-3188)

  - Integer signedness error in the CIFSFindNext function in fs/cifs/cifssmb.c in the Linux kernel before 3.1     allows remote CIFS servers to cause a denial of service (memory corruption) or possibly have unspecified     other impact via a large length value in a response to a read request for a directory. (CVE-2011-3191)

  - Buffer overflow in the fuse_notify_inval_entry function in fs/fuse/dev.c in the Linux kernel before 3.1     allows local users to cause a denial of service (BUG_ON and system crash) by leveraging the ability to     mount a FUSE filesystem. (CVE-2011-3353)

  - The dma_rx function in drivers/net/wireless/b43/dma.c in the Linux kernel before 2.6.39 does not properly     allocate receive buffers, which allows remote attackers to cause a denial of service (system crash) via a     crafted frame. (CVE-2011-3359)

  - The setup_cifs_sb function in fs/cifs/connect.c in the Linux kernel before 2.6.39 does not properly handle     DFS referrals, which allows remote CIFS servers to cause a denial of service (system crash) by placing a     referral at the root of a share. (CVE-2011-3363)

  - A certain Red Hat patch to the vlan_hwaccel_do_receive function in net/8021q/vlan_core.c in the Linux     kernel 2.6.32 on Red Hat Enterprise Linux (RHEL) 6 allows remote attackers to cause a denial of service     (system crash) via priority-tagged VLAN frames. (CVE-2011-3593)

  - The udp6_ufo_fragment function in net/ipv6/udp.c in the Linux kernel before 2.6.39, when a certain UDP     Fragmentation Offload (UFO) configuration is enabled, allows remote attackers to cause a denial of service     (system crash) by sending fragmented IPv6 UDP packets to a bridge device. (CVE-2011-4326)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Ryan Sweat discovered that the kernel incorrectly handled certain VLAN packets. On some systems, a remote attacker could send specially crafted traffic to crash the system, leading to a denial of service.
(CVE-2011-1576)

Timo Warns discovered that the EFI GUID partition table was not correctly parsed. A physically local attacker that could insert mountable devices could exploit this to crash the system or possibly gain root privileges. (CVE-2011-1776)

Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not correctly check the origin of mount points. A local attacker could exploit this to trick the system into unmounting arbitrary mount points, leading to a denial of service. (CVE-2011-1833)

Dan Rosenberg discovered that the IPv4 diagnostic routines did not correctly validate certain requests. A local attacker could exploit this to consume CPU resources, leading to a denial of service.
(CVE-2011-2213)

Dan Rosenberg discovered that the Bluetooth stack incorrectly handled certain L2CAP requests. If a system was using Bluetooth, a remote attacker could send specially crafted traffic to crash the system or gain root privileges. (CVE-2011-2497)

Fernando Gont discovered that the IPv6 stack used predictable fragment identification numbers. A remote attacker could exploit this to exhaust network resources, leading to a denial of service.
(CVE-2011-2699)

Mauro Carvalho Chehab discovered that the si4713 radio driver did not correctly check the length of memory copies. If this hardware was available, a local attacker could exploit this to crash the system or gain root privileges. (CVE-2011-2700)

Herbert Xu discovered that certain fields were incorrectly handled when Generic Receive Offload (CVE-2011-2723)

The performance counter subsystem did not correctly handle certain counters. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2918)

Time Warns discovered that long symlinks were incorrectly handled on Be filesystems. A local attacker could exploit this with a malformed Be filesystem and crash the system, leading to a denial of service.
(CVE-2011-2928)

Darren Lavender discovered that the CIFS client incorrectly handled certain large values. A remote attacker with a malicious server could exploit this to crash the system or possibly execute arbitrary code as the root user. (CVE-2011-3191)

Gideon Naim discovered a flaw in the Linux kernel's handling VLAN 0 frames. An attacker on the local network could exploit this flaw to cause a denial of service. (CVE-2011-3593).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Ryan Sweat discovered that the kernel incorrectly handled certain VLAN packets. On some systems, a remote attacker could send specially crafted traffic to crash the system, leading to a denial of service.
(CVE-2011-1576)

Vasiliy Kulikov and Dan Rosenberg discovered that ecryptfs did not correctly check the origin of mount points. A local attacker could exploit this to trick the system into unmounting arbitrary mount points, leading to a denial of service. (CVE-2011-1833)

Vasiliy Kulikov discovered that taskstats did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2494)

Vasiliy Kulikov discovered that /proc/PID/io did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2495)

Dan Rosenberg discovered that the Bluetooth stack incorrectly handled certain L2CAP requests. If a system was using Bluetooth, a remote attacker could send specially crafted traffic to crash the system or gain root privileges. (CVE-2011-2497)

It was discovered that the EXT4 filesystem contained multiple off-by-one flaws. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2695)

Fernando Gont discovered that the IPv6 stack used predictable fragment identification numbers. A remote attacker could exploit this to exhaust network resources, leading to a denial of service.
(CVE-2011-2699)

Christian Ohm discovered that the perf command looks for configuration files in the current directory. If a privileged user were tricked into running perf in a directory containing a malicious configuration file, an attacker could run arbitrary commands and possibly gain privileges.
(CVE-2011-2905)

Time Warns discovered that long symlinks were incorrectly handled on Be filesystems. A local attacker could exploit this with a malformed Be filesystem and crash the system, leading to a denial of service.
(CVE-2011-2928)

Dan Kaminsky discovered that the kernel incorrectly handled random sequence number generation. An attacker could use this flaw to possibly predict sequence numbers and inject packets. (CVE-2011-3188)

Darren Lavender discovered that the CIFS client incorrectly handled certain large values. A remote attacker with a malicious server could exploit this to crash the system or possibly execute arbitrary code as the root user. (CVE-2011-3191)

Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user who can mount a FUSE file system could cause a denial of service.
(CVE-2011-3353)

Gideon Naim discovered a flaw in the Linux kernel's handling VLAN 0 frames. An attacker on the local network could exploit this flaw to cause a denial of service. (CVE-2011-3593).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2011:1465 advisory.

  - kernel: tpm: infoleak (CVE-2011-1162)

  - kernel: corrupted GUID partition tables can cause kernel oops (CVE-2011-1577)

  - kernel: taskstats io infoleak (CVE-2011-2494)

  - kernel: ipv6: make fragment identifications less predictable (CVE-2011-2699)

  - kernel: perf tools: may parse user-controlled configuration file (CVE-2011-2905)

  - kernel: net: improve sequence number generation (CVE-2011-3188)

  - kernel: cifs: signedness issue in CIFSFindNext() (CVE-2011-3191)

  - kernel: fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message (CVE-2011-3353)

  - kernel: b43: allocate receive buffers big enough for max frame len + offset (CVE-2011-3359)

  - kernel: cifs: always do is_path_accessible check in cifs_mount (CVE-2011-3363)

  - kernel: vlan: fix panic when handling priority tagged frames (CVE-2011-3593)

  - kernel: wrong headroom check in udp6_ufo_fragment() (CVE-2011-4326)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
83611	SUSE SLES11 Security Update : kernel (SUSE-SU-2014:0287-1)	Nessus	SuSE Local Security Checks	5/20/2015	1/19/2021	high
61179	Scientific Linux Security Update : kernel on SL6.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	8/1/2012	1/14/2021	critical
69585	Amazon Linux AMI : kernel (ALAS-2011-26)	Nessus	Amazon Linux Local Security Checks	9/4/2013	8/3/2020	critical
68424	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2011-2033)	Nessus	Oracle Linux Local Security Checks	7/12/2013	9/8/2021	critical
56644	Ubuntu 10.10 : linux-mvl-dove vulnerabilities (USN-1245-1)	Nessus	Ubuntu Local Security Checks	10/26/2011	3/9/2013	critical
68393	Oracle Linux 6 : kernel (ELSA-2011-1465)	Nessus	Oracle Linux Local Security Checks	7/12/2013	9/8/2021	critical
56466	Ubuntu 10.10 : linux vulnerabilities (USN-1227-1)	Nessus	Ubuntu Local Security Checks	10/12/2011	9/19/2019	critical
56638	Ubuntu 10.04 LTS : linux-ec2 vulnerabilities (USN-1239-1)	Nessus	Ubuntu Local Security Checks	10/26/2011	9/19/2019	critical
56927	RHEL 6 : kernel (RHSA-2011:1465)	Nessus	Red Hat Local Security Checks	11/23/2011	4/24/2024	critical
56344	Ubuntu 10.04 LTS : linux-lts-backport-maverick vulnerabilities (USN-1219-1)	Nessus	Ubuntu Local Security Checks	9/30/2011	9/19/2019	critical
56639	Ubuntu 10.04 LTS : linux-mvl-dove vulnerabilities (USN-1240-1)	Nessus	Ubuntu Local Security Checks	10/26/2011	3/9/2013	critical
56747	Ubuntu 10.04 LTS : linux vulnerabilities (USN-1253-1)	Nessus	Ubuntu Local Security Checks	11/9/2011	9/19/2019	critical

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