An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and confidentiality threat.

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

  - An out-of-bounds (OOB) memory write flaw was found in the NFSD in the Linux kernel. Missing sanity may     lead to a write beyond bmval[bmlen-1] in nfsd4_decode_bitmap4 in fs/nfsd/nfs4xdr.c. In this flaw, a local     attacker with user privilege may gain access to out-of-bounds memory, leading to a system integrity and     confidentiality threat. (CVE-2021-4090)

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

An update of the linux package has been released.

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5362-1 advisory.

    Nick Gregory discovered that the Linux kernel incorrectly handled network offload functionality. A local     attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2022-25636)

    Enrico Barberis, Pietro Frigo, Marius Muench, Herbert Bos, and Cristiano Giuffrida discovered that     hardware mitigations added by ARM to their processors to address Spectre-BTI were insufficient. A local     attacker could potentially use this to expose sensitive information. (CVE-2022-23960)

    It was discovered that the BPF verifier in the Linux kernel did not properly restrict pointer types in     certain situations. A local attacker could use this to cause a denial of service (system crash) or     possibly execute arbitrary code. (CVE-2022-23222)

    Max Kellermann discovered that the Linux kernel incorrectly handled Unix pipes. A local attacker could     potentially use this to modify any file that could be opened for reading. (CVE-2022-0847)

    Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly     restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain     administrative privileges. (CVE-2022-0492)

    William Liu and Jamie Hill-Daniel discovered that the file system context functionality in the Linux     kernel contained an integer underflow vulnerability, leading to an out-of-bounds write. A local attacker     could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2022-0185)

    Enrico Barberis, Pietro Frigo, Marius Muench, Herbert Bos, and Cristiano Giuffrida discovered that     hardware mitigations added by Intel to their processors to address Spectre-BTI were insufficient. A local     attacker could potentially use this to expose sensitive information. (CVE-2022-0001)

    Jann Horn discovered a race condition in the Unix domain socket implementation in the Linux kernel that     could result in a read-after-free. A local attacker could use this to cause a denial of service (system     crash) or possibly execute arbitrary code. (CVE-2021-4083)

    It was discovered that the NFS server implementation in the Linux kernel contained an out-of-bounds write     vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2021-4090)

    Kirill Tkhai discovered that the XFS file system implementation in the Linux kernel did not calculate size     correctly when pre-allocating space in some situations. A local attacker could use this to expose     sensitive information. (CVE-2021-4155)

    It was discovered that the AMD Radeon GPU driver in the Linux kernel did not properly validate writes in     the debugfs file system. A privileged attacker could use this to cause a denial of service (system crash)     or possibly execute arbitrary code. (CVE-2021-42327)

    Sushma Venkatesh Reddy discovered that the Intel i915 graphics driver in the Linux kernel did not perform     a GPU TLB flush in some situations. A local attacker could use this to cause a denial of service or     possibly execute arbitrary code. (CVE-2022-0330)

    Samuel Page discovered that the Transparent Inter-Process Communication (TIPC) protocol implementation in     the Linux kernel contained a stack-based buffer overflow. A remote attacker could use this to cause a     denial of service (system crash) for systems that have a TIPC bearer configured. (CVE-2022-0435)

    It was discovered that the KVM implementation for s390 systems in the Linux kernel did not properly     prevent memory operations on PVM guests that were in non-protected mode. A local attacker could use this     to obtain unauthorized memory write access. (CVE-2022-0516)

    It was discovered that the ICMPv6 implementation in the Linux kernel did not properly deallocate memory in     certain situations. A remote attacker could possibly use this to cause a denial of service (memory     exhaustion). (CVE-2022-0742)

    It was discovered that the VMware Virtual GPU driver in the Linux kernel did not properly handle certain     failure conditions, leading to a stale entry in the file descriptor table. A local attacker could use this     to expose sensitive information or possibly gain administrative privileges. (CVE-2022-22942)

Tenable has extracted the preceding description block directly from the Ubuntu 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 remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5265-1 advisory.

    Jeremy Cline discovered a use-after-free in the nouveau graphics driver of the Linux kernel during device     removal. A privileged or physically proximate attacker could use this to cause a denial of service (system     crash). (CVE-2020-27820)

    It was discovered that the Bluetooth subsystem in the Linux kernel contained a use-after-free     vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2021-3640)

    Likang Luo discovered that a race condition existed in the Bluetooth subsystem of the Linux kernel,     leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service     (system crash) or possibly execute arbitrary code. (CVE-2021-3752)

    It was discovered that the SCTP protocol implementation in the Linux kernel did not properly verify VTAGs     in some situations. A remote attacker could possibly use this to cause a denial of service (connection     disassociation). (CVE-2021-3772)

    It was discovered that the eBPF implementation in the Linux kernel contained a race condition around read-     only maps. A privileged attacker could use this to modify read-only maps. (CVE-2021-4001)

    It was discovered that the NFS server implementation in the Linux kernel contained an out-of-bounds write     vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2021-4090)

    Felix Wilhelm discovered that the KVM implementation in the Linux kernel did not properly handle exit     events from AMD Secure Encrypted Virtualization-Encrypted State (SEV-ES) guest VMs. An attacker in a guest     VM could use this to cause a denial of service (host kernel crash) or possibly execute arbitrary code in     the host kernel. (CVE-2021-4093)

    Lin Ma discovered that the NFC Controller Interface (NCI) implementation in the Linux kernel contained a     race condition, leading to a use-after-free vulnerability. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-4202)

    It was discovered that the AMD Radeon GPU driver in the Linux kernel did not properly validate writes in     the debugfs file system. A privileged attacker could use this to cause a denial of service (system crash)     or possibly execute arbitrary code. (CVE-2021-42327)

    Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel did not properly perform bounds     checking in some situations. A local attacker could use this to cause a denial of service (system crash)     or possibly execute arbitrary code. (CVE-2021-42739)

Tenable has extracted the preceding description block directly from the Ubuntu 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 remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5217-1 advisory.

    It was discovered that the NFS server implementation in the Linux kernel contained an out-of-bounds write     vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2021-4090)

    It was discovered that the eBPF implementation in the Linux kernel did not properly validate the memory     size of certain ring buffer operation arguments. A local attacker could use this to cause a denial of     service (system crash) or possibly execute arbitrary code. (CVE-2021-4204)

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

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	Severity
248039	Linux Distros Unpatched Vulnerability : CVE-2021-4090	Nessus	Misc.	high
204097	Photon OS 4.0: Linux PHSA-2024-4.0-0655	Nessus	PhotonOS Local Security Checks	high
159395	Ubuntu 20.04 LTS : Linux kernel (Intel IOTG) vulnerabilities (USN-5362-1)	Nessus	Ubuntu Local Security Checks	high
157351	Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-5265-1)	Nessus	Ubuntu Local Security Checks	high
156612	Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-5217-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2021-4090

high

Tenable Plugins

high

high

high

high

high