QID 355761

Date Published: 2023-08-09

QID 355761: Amazon Linux Security Advisory for kernel : ALAS-2023-1792

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) an out-of-bounds write vulnerability in the linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. the qfq_change_agg() function in net/sched/sch_qfq.c allows an out-of-bounds write because lmax is updated according to packet sizes without bounds checks. we recommend upgrading past commit 3e337087c3b5805fe0b8a46ba622a962880b5d64. (
( CVE-2023-3611) 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: ALAS-2023-1792 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 355761

    CVE-2023-3609 | CVE-2023-3611 | CVE-2023-3776 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS-2023-1792 amazon linux URL Logo alas.aws.amazon.com/ALAS-2023-1792.html
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