Out-of-bounds Write Affecting kpatch-patch-4_18_0-553_72_1 package, versions <0:1-9.el8_10


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
0.53% (42nd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL8-KPATCHPATCH4180553721-17728112
  • published30 Jun 2026
  • disclosed18 May 2026

Introduced: 18 May 2026

CVE-2026-46331  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kpatch-patch-4_18_0-553_72_1 to version 0:1-9.el8_10 or higher.
This issue was patched in RHSA-2026:33220.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kpatch-patch-4_18_0-553_72_1 package and not the kpatch-patch-4_18_0-553_72_1 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

net/sched: fix pedit partial COW leading to page cache corruption

tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd.

Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.

CVSS Base Scores

version 3.1