What is CVE-2026-46331?
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.
Timeline
- 2026-06-16Published to the U.S. National Vulnerability Database (NVD)
- 2026-06-27First covered in a defend.network daily briefing
- 2026-09-02NVD record last updated
Affected product
Linux Kernel
Remediation Steps
- Apply the latest Linux kernel security patch addressing the pedit COW out-of-bounds write vulnerability
- Verify all systems running affected kernel versions are identified and prioritized
- Test patches in staging environment before production deployment
- Monitor systems for signs of privilege escalation attempts
References
- https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b
- https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512
- https://git.kernel.org/stable/c/544d857b42a1734b923040e13aa61a6fd4746cf2
- https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a
- https://nvd.nist.gov/vuln/detail/CVE-2026-46331
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 5 of June 2026 (June 29 – July 5)
- Vulnerability Priority Report – Week 4 of June 2026 (June 22 – 28)
- Signal backup keys targeted; Linux kernel RCE; AWS Q credential theft (2026-06-27)
Browse all tracked CVEs in the defend.network CVE database →