UBUNTU-CVE-2023-46813

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    UBUNTU-CVE-2023-46813

    Published: 27 Oct 2023Last Modified: 9 Sept 2026
    Upstream:
    CVE-2023-46813
    Aliases:
    USN-6533-1
    USN-6624-1
    USN-6626-1

    Summary:

    Details: An issue was discovered in the Linux kernel before 6.5.9, exploitable by local users with userspace access to MMIO registers. Incorrect access checking in the #VC handler and instruction emulation of the SEV-ES emulation of MMIO accesses could lead to arbitrary write access to kernel memory (and thus privilege escalation). This depends on a race condition through which userspace can replace an instruction before the #VC handler reads it.

    References: https://ubuntu.com/security/CVE-2023-46813, https://git.kernel.org/linus/63e44bc52047f182601e7817da969a105aa1f721, https://git.kernel.org/linus/b9cb9c45583b911e0db71d09caa6b56469eb2bdf, https://git.kernel.org/linus/a37cd2a59d0cb270b1bba568fd3a3b8668b9d3ba, https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.9, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b9cb9c45583b911e0db71d09caa6b56469eb2bdf, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=63e44bc52047f182601e7817da969a105aa1f721, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a37cd2a59d0cb270b1bba568fd3a3b8668b9d3ba, https://ubuntu.com/security/notices/USN-6533-1, https://ubuntu.com/security/notices/USN-6624-1, https://ubuntu.com/security/notices/USN-6626-1, https://ubuntu.com/security/notices/USN-6628-1, https://ubuntu.com/security/notices/USN-6626-2, https://ubuntu.com/security/notices/USN-6628-2, https://ubuntu.com/security/notices/USN-6626-3, https://ubuntu.com/security/notices/USN-6652-1, https://www.cve.org/CVERecord?id=CVE-2023-46813

    Affected packages

    Package

    Name: linux-hwe-edge

    Purl: pkg:deb/ubuntu/linux-hwe-edge?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.8.0-28.30~16.04.1
    4.8.0-30.32~16.04.1
    4.8.0-32.34~16.04.1
    4.8.0-34.36~16.04.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2023-46813 | CVE-DB