In the Linux kernel, the following vulnerability has been resolved: rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access For kernels built with CONFIG_PREEMPT_RCU=y, the following scenario can result in a NULL-pointer dereference: CPU1 CPU2 rcu_preempt_deferred_qs_irqrestore rcu_print_task_exp_stall if (special.b.blocked) READ_ONCE(rnp->exp_tasks) != NULL raw_spin_lock_rcu_node np = rcu_next_node_entry(t, rnp) if (&t->rcu_node_entry == rnp->exp_tasks) WRITE_ONCE(rnp->exp_tasks, np) .... raw_spin_unlock_irqrestore_rcu_node raw_spin_lock_irqsave_rcu_node t = list_entry(rnp->exp_tasks->prev, struct task_struct, rcu_node_entry) (if rnp->exp_tasks is NULL, this will dereference a NULL pointer) The problem is that CPU2 accesses the rcu_node structure's->exp_tasks field without holding the rcu_node structure's ->lock and CPU2 did not observe CPU1's change to rcu_node structure's ->exp_tasks in time. Therefore, if CPU1 sets rcu_node structure's->exp_tasks pointer to NULL, then CPU2 might dereference that NULL pointer. This commit therefore holds the rcu_node structure's ->lock while accessing that structure's->exp_tasks field. [ paulmck: Apply Frederic Weisbecker feedback. ]

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access For kernels built with CONFIG_PREEMPT_RCU=y,     the following scenario can result in a NULL-pointer dereference: CPU1 CPU2     rcu_preempt_deferred_qs_irqrestore rcu_print_task_exp_stall if (special.b.blocked)     READ_ONCE(rnp->exp_tasks) != NULL raw_spin_lock_rcu_node np = rcu_next_node_entry(t, rnp) if     (&t->rcu_node_entry == rnp->exp_tasks) WRITE_ONCE(rnp->exp_tasks, np) ....
    raw_spin_unlock_irqrestore_rcu_node raw_spin_lock_irqsave_rcu_node t = list_entry(rnp->exp_tasks->prev,     struct task_struct, rcu_node_entry) (if rnp->exp_tasks is NULL, this will dereference a NULL pointer) The     problem is that CPU2 accesses the rcu_node structure's->exp_tasks field without holding the rcu_node     structure's ->lock and CPU2 did not observe CPU1's change to rcu_node structure's ->exp_tasks in time.
    Therefore, if CPU1 sets rcu_node structure's->exp_tasks pointer to NULL, then CPU2 might dereference that     NULL pointer. This commit therefore holds the rcu_node structure's ->lock while accessing that     structure's->exp_tasks field. [ paulmck: Apply Frederic Weisbecker feedback. ] (CVE-2023-53419)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of kernel installed on the remote host is prior to 5.15.117-72.142. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2023-021 advisory.

    In the Linux kernel through 6.2.7, fs/ntfs3/inode.c has an invalid kfree because it does not validate MFT     flags before replaying logs. (CVE-2022-48425)

    In the Linux kernel, the following vulnerability has been resolved:

    binder: fix UAF of alloc->vma in race with munmap() (CVE-2022-50240)

    In the Linux kernel, the following vulnerability has been resolved:

    binder: fix UAF of alloc->vma in race with munmap() (CVE-2022-50338)

    There is a potential deadlock in the eBPF subsystem in the Linux kernel.

    The default sysctl configuration kernel.unprivileged_bpf_disabled on Amazon Linux does not allow     unprivileged users to use eBPF. (CVE-2023-0160)

    A flaw was found in the Linux kernel's networking subsystem within the RPL protocol's handling. This issue     results from the improper handling of user-supplied data, which can lead to an assertion failure. This     flaw allows an unauthenticated, remote attacker to create a denial of service condition on the system.
    (CVE-2023-2156)

    A heap out-of-bounds write vulnerability in the Linux Kernel ipvlan network driver can be exploited to     achieve local privilege escalation.

    The out-of-bounds write is caused by missing skb->cb  initialization in the ipvlan network driver. The     vulnerability is reachable if CONFIG_IPVLAN is enabled.

    We recommend upgrading past commit 90cbed5247439a966b645b34eb0a2e037836ea8e. (CVE-2023-3090)

    A flaw in the Linux Kernel found in the GFS2 file system. On corrupted gfs2 file systems the evict code     can try to reference the journal descriptor structure, jdesc, after it has been freed and set to NULL. It     can lead to null pointer dereference when gfs2_trans_begin being called and then fail     ingfs2_evict_inode(). (CVE-2023-3212)

    An out of bounds (OOB) memory access flaw was found in the Linux kernel in relay_file_read_start_pos in     kernel/relay.c in the relayfs. This flaw could allow a local attacker to crash the system or leak kernel     internal information. (CVE-2023-3268)

    An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in     lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an     offset. (CVE-2023-34256)

    A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux     Kernel. In this flaw an attacker with local user access may lead to a system crash or a leak of internal     kernel information. (CVE-2023-3567)

    An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7.
    It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets.
    This may result in denial of service or privilege escalation. (CVE-2023-35788)

    In the Linux kernel, the following vulnerability has been resolved:

    serial: 8250: Reinit port->pm on port specific driver unbind (CVE-2023-53176)

    In the Linux kernel, the following vulnerability has been resolved:

    ACPICA: Avoid undefined behavior: applying zero offset to null pointer (CVE-2023-53182)

    In the Linux kernel, the following vulnerability has been resolved:

    fs/ntfs3: Add length check in indx_get_root (CVE-2023-53194)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: fix i_disksize exceeding i_size problem in paritally written case (CVE-2023-53270)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: add bounds checking in get_max_inline_xattr_value_size() (CVE-2023-53285)

    In the Linux kernel, the following vulnerability has been resolved:

    fs/ntfs3: Fix null-ptr-deref on inode->i_op in ntfs_lookup() (CVE-2023-53294)

    In the Linux kernel, the following vulnerability has been resolved:

    md/raid10: fix leak of 'r10bio->remaining' for recovery (CVE-2023-53299)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: fix WARNING in mb_find_extent (CVE-2023-53317)

    In the Linux kernel, the following vulnerability has been resolved:

    rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access (CVE-2023-53419)

    In the Linux kernel, the following vulnerability has been resolved:

    net: add vlan_get_protocol_and_depth() helper (CVE-2023-53433)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: remove a BUG_ON in ext4_mb_release_group_pa() (CVE-2023-53450)

    In the Linux kernel, the following vulnerability has been resolved:

    x86/MCE/AMD: Use an u64 for bank_map (CVE-2023-53474)

    In the Linux kernel, the following vulnerability has been resolved:

    lib: cpu_rmap: Avoid use after free on rmap->obj array entries (CVE-2023-53484)

    In the Linux kernel, the following vulnerability has been resolved:

    virtio_net: Fix error unwinding of XDP initialization (CVE-2023-53499)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: allow ext4_get_group_info() to fail (CVE-2023-53503)

    In the Linux kernel, the following vulnerability has been resolved:

    nbd: fix incomplete validation of ioctl arg (CVE-2023-53513)

    A use-after-free flaw was found in the __ext4_remount in fs/ext4/super.c in ext4 in the Linux kernel. This     flaw allows a local user to cause an information leak problem while freeing the old quota file names     before a potential failure, leading to a use-after-free. (CVE-2024-0775)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

The version of kernel installed on the remote host is prior to 5.10.184-174.730. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.10-2023-034 advisory.

    A flaw was found in the Linux kernel Traffic Control (TC) subsystem. Using a specific networking     configuration (redirecting egress packets to ingress using TC action mirred) a local unprivileged user     could trigger a CPU soft lockup (ABBA deadlock) when the transport protocol in use (TCP or SCTP) does a     retransmission, resulting in a denial of service condition. (CVE-2022-4269)

    In the Linux kernel, the following vulnerability has been resolved:

    btrfs: unset reloc control if transaction commit fails in prepare_to_relocate() (CVE-2022-50067)

    There is a potential deadlock in the eBPF subsystem in the Linux kernel.

    The default sysctl configuration kernel.unprivileged_bpf_disabled on Amazon Linux does not allow     unprivileged users to use eBPF. (CVE-2023-0160)

    A flaw was found in the Linux kernel's networking subsystem within the RPL protocol's handling. This issue     results from the improper handling of user-supplied data, which can lead to an assertion failure. This     flaw allows an unauthenticated, remote attacker to create a denial of service condition on the system.
    (CVE-2023-2156)

    A heap out-of-bounds write vulnerability in the Linux Kernel ipvlan network driver can be exploited to     achieve local privilege escalation.

    The out-of-bounds write is caused by missing skb->cb  initialization in the ipvlan network driver. The     vulnerability is reachable if CONFIG_IPVLAN is enabled.

    We recommend upgrading past commit 90cbed5247439a966b645b34eb0a2e037836ea8e. (CVE-2023-3090)

    A use after free vulnerability was found in prepare_to_relocate in fs/btrfs/relocation.c in btrfs in the     Linux Kernel. This possible flaw can be triggered by calling btrfs_ioctl_balance() before calling     btrfs_ioctl_defrag(). (CVE-2023-3111)

    A use-after-free flaw was found in r592_remove in drivers/memstick/host/r592.c in media access in the     Linux Kernel. This flaw allows a local attacker to crash the system at device disconnect, possibly leading     to a kernel information leak. (CVE-2023-3141)

    A flaw in the Linux Kernel found in the GFS2 file system. On corrupted gfs2 file systems the evict code     can try to reference the journal descriptor structure, jdesc, after it has been freed and set to NULL. It     can lead to null pointer dereference when gfs2_trans_begin being called and then fail     ingfs2_evict_inode(). (CVE-2023-3212)

    An out of bounds (OOB) memory access flaw was found in the Linux kernel in relay_file_read_start_pos in     kernel/relay.c in the relayfs. This flaw could allow a local attacker to crash the system or leak kernel     internal information. (CVE-2023-3268)

    An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in     lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an     offset. (CVE-2023-34256)

    A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux     Kernel. In this flaw an attacker with local user access may lead to a system crash or a leak of internal     kernel information. (CVE-2023-3567)

    An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7.
    It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets.
    This may result in denial of service or privilege escalation. (CVE-2023-35788)

    In the Linux kernel, the following vulnerability has been resolved:

    serial: 8250: Reinit port->pm on port specific driver unbind (CVE-2023-53176)

    In the Linux kernel, the following vulnerability has been resolved:

    ACPICA: Avoid undefined behavior: applying zero offset to null pointer (CVE-2023-53182)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: add bounds checking in get_max_inline_xattr_value_size() (CVE-2023-53285)

    In the Linux kernel, the following vulnerability has been resolved:

    md/raid10: fix leak of 'r10bio->remaining' for recovery (CVE-2023-53299)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: fix WARNING in mb_find_extent (CVE-2023-53317)

    In the Linux kernel, the following vulnerability has been resolved:

    nilfs2: do not write dirty data after degenerating to read-only (CVE-2023-53337)

    In the Linux kernel, the following vulnerability has been resolved:

    rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access (CVE-2023-53419)

    In the Linux kernel, the following vulnerability has been resolved:

    net: add vlan_get_protocol_and_depth() helper (CVE-2023-53433)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: remove a BUG_ON in ext4_mb_release_group_pa() (CVE-2023-53450)

    In the Linux kernel, the following vulnerability has been resolved:

    x86/MCE/AMD: Use an u64 for bank_map (CVE-2023-53474)

    In the Linux kernel, the following vulnerability has been resolved:

    lib: cpu_rmap: Avoid use after free on rmap->obj array entries (CVE-2023-53484)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: allow ext4_get_group_info() to fail (CVE-2023-53503)

    A use-after-free flaw was found in the __ext4_remount in fs/ext4/super.c in ext4 in the Linux kernel. This     flaw allows a local user to cause an information leak problem while freeing the old quota file names     before a potential failure, leading to a use-after-free. (CVE-2024-0775)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-228 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    binder: fix UAF of alloc->vma in race with munmap() (CVE-2022-50240)

    In the Linux kernel, the following vulnerability has been resolved:

    binder: fix UAF of alloc->vma in race with munmap() (CVE-2022-50338)

    A flaw was found in the Linux kernel's networking subsystem within the RPL protocol's handling. This issue     results from the improper handling of user-supplied data, which can lead to an assertion failure. This     flaw allows an unauthenticated, remote attacker to create a denial of service condition on the system.
    (CVE-2023-2156)

    A heap out-of-bounds write vulnerability in the Linux Kernel ipvlan network driver can be exploited to     achieve local privilege escalation.

    The out-of-bounds write is caused by missing skb->cb  initialization in the ipvlan network driver. The     vulnerability is reachable if CONFIG_IPVLAN is enabled.

    We recommend upgrading past commit 90cbed5247439a966b645b34eb0a2e037836ea8e. (CVE-2023-3090)

    A use-after-free flaw was found in vcs_read in drivers/tty/vt/vc_screen.c in vc_screen in the Linux     Kernel. In this flaw an attacker with local user access may lead to a system crash or a leak of internal     kernel information. (CVE-2023-3567)

    An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7.
    It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets.
    This may result in denial of service or privilege escalation. (CVE-2023-35788)

    In the Linux kernel, the following vulnerability has been resolved:

    serial: 8250: Reinit port->pm on port specific driver unbind (CVE-2023-53176)

    In the Linux kernel, the following vulnerability has been resolved:

    mm: fix zswap writeback race condition (CVE-2023-53178)

    In the Linux kernel, the following vulnerability has been resolved:

    ACPICA: Avoid undefined behavior: applying zero offset to null pointer (CVE-2023-53182)

    In the Linux kernel, the following vulnerability has been resolved:

    irqchip/gicv3: Workaround for NVIDIA erratum T241-FABRIC-4 (CVE-2023-53383)

    In the Linux kernel, the following vulnerability has been resolved:

    rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access (CVE-2023-53419)

    In the Linux kernel, the following vulnerability has been resolved:

    net: add vlan_get_protocol_and_depth() helper (CVE-2023-53433)

    In the Linux kernel, the following vulnerability has been resolved:

    net: skb_partial_csum_set() fix against transport header magic value (CVE-2023-53439)

    In the Linux kernel, the following vulnerability has been resolved:

    ACPI: processor: Check for null return of devm_kzalloc() in fch_misc_setup() (CVE-2023-53483)

    In the Linux kernel, the following vulnerability has been resolved:

    lib: cpu_rmap: Avoid use after free on rmap->obj array entries (CVE-2023-53484)

    In the Linux kernel, the following vulnerability has been resolved:

    virtio_net: Fix error unwinding of XDP initialization (CVE-2023-53499)

    In the Linux kernel, the following vulnerability has been resolved:

    ext4: allow ext4_get_group_info() to fail (CVE-2023-53503)

    In the Linux kernel, the following vulnerability has been resolved:

    nbd: fix incomplete validation of ioctl arg (CVE-2023-53513)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

An update of the linux package has been released.

ID	Name	Product	Family	Severity
265515	Linux Distros Unpatched Vulnerability : CVE-2023-53419	Nessus	Misc.	medium
177781	Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2023-021 (ALASKERNEL-5.15-2023-021)	Nessus	Amazon Linux Local Security Checks	high
177770	Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2023-034 (ALASKERNEL-5.10-2023-034)	Nessus	Amazon Linux Local Security Checks	high
177674	Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2023-228)	Nessus	Amazon Linux Local Security Checks	high
153035	Photon OS 4.0: Linux PHSA-2021-4.0-0095	Nessus	PhotonOS Local Security Checks	high

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