QID 356537

Date Published: 2023-11-08

QID 356537: Amazon Linux Security Advisory for kernel-livepatch : ALAS2023LIVEPATCH-2023-012

A use-after-free vulnerability in the linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation. if tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter().
If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. we recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc. (
( CVE-2023-3609) a use-after-free vulnerability in the linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. if tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter().
If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. we recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f. (
( CVE-2023-3776)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALASLIVEPATCH-2023-012 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 356537

    CVE-2023-3776 | CVE-2023-3609 |
    Software Advisories
    Advisory ID Software Component Link
    ALASLIVEPATCH-2023-012 amazon linux 2023 URL Logo alas.aws.amazon.com/AL2023/ALASLIVEPATCH-2023-012.html
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