CVE-2026-43036net: use skb_header_pointer() for TCPv4 GSO frag_off check
- 5.5MediumCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: net: use skb_header_pointer() for TCPv4 GSO frag_off check Syzbot reported a KMSAN uninit-value warning in gso_features_check() called from netif_skb_features() [1]. gso_features_check() reads iph->frag_off to decide whether to clear mangleid_features. Accessing the IPv4 header via ip_hdr()/inner_ip_hdr() can rely on skb header offsets that are not always safe for direct dereference on packets injected from PF_PACKET paths. Use skb_header_pointer() for the TCPv4 frag_off check so the header read is robust whether data is already linear or needs copying. [1] https://syzkaller.appspot.com/bug?extid=1543a7d954d9c6d00407
Timeline
ID reserved
By Linux
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected cbc53e08a793b073e79f42ca33f1f3568703540d – < 362bacb37d88a178bfaefc4484623eae44425a70
- affected cbc53e08a793b073e79f42ca33f1f3568703540d – < 5057502630fbc8ce468ff617ff59af275960b537
- affected cbc53e08a793b073e79f42ca33f1f3568703540d – < f7a6cd508e9e825a2c69fa9e13d41ee156852f25
- affected cbc53e08a793b073e79f42ca33f1f3568703540d – < cc91202fc20a44aab4c206f12a2bfe05da936051
- affected cbc53e08a793b073e79f42ca33f1f3568703540d – < d970341cfa5594614c7a6634886c7688b4f5cafd
- affected cbc53e08a793b073e79f42ca33f1f3568703540d – < ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0
- affected 4.7
- unaffected < 4.7
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.81 – ≤ 6.12.*
- unaffected 6.18.22 – ≤ 6.18.*
- unaffected 6.19.12 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/362bacb37d88a178bfaefc4484623eae44425a70 (opens in a new tab)
- https://git.kernel.org/stable/c/5057502630fbc8ce468ff617ff59af275960b537 (opens in a new tab)
- https://git.kernel.org/stable/c/f7a6cd508e9e825a2c69fa9e13d41ee156852f25 (opens in a new tab)
- https://git.kernel.org/stable/c/cc91202fc20a44aab4c206f12a2bfe05da936051 (opens in a new tab)
- https://git.kernel.org/stable/c/d970341cfa5594614c7a6634886c7688b4f5cafd (opens in a new tab)
- https://git.kernel.org/stable/c/ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-26635 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43036)Record last updated .