Medium [CVE-2023-3773] Kernel: xfrm: out-of-bounds read of xfrma_mtimer_thresh nlattr
This medium-severity Red Hat Linux advisory covers CVE-2023-3773 affecting Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-125.
Affected Red Hat products: Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2023:6583.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
- kernel-0:5.14.0-362.8.1.el9_3
- RHSA-2023:6583
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:5.14.0-362.8.1.el9_3, RHSA-2023:6583. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
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