- 9.8CriticalCVSS base score
- 0.51%Exploitation in 30 daysEPSS · top 56% 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: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() skb_tunnel_check_pmtu() can change skb->head. Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF. Use instead ip_hdr(skb) as done in drivers/net/bareudp.c and drivers/net/geneve.c. Found by Sashiko.
Timeline
ID reserved
By Linux
Published
- 3 months later
· 3 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.51% · top 56% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 6b8bfce9d2f774d2c2243e0248e03efb99bba6c0
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 9257f56ac47ef1976bcd056cf986a9988eeec67a
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 8d435d68d71fb875876b722f4136caf74f2f48bd
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < dc3bfa050f873371e745bdf478b1f5b738e5733d
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 609e63312c29aad18026a1d3222e123d4b6b0feb
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 5303925e360527243b46a440a04667826bbc72b7
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < a493efd4336cf19122ae0e4cbb3d31b32d70deea
- affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 7d9ef0cb271555d8cf39fefe6c981e1493b25ecf
- affected 5.9
- unaffected < 5.9
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.93 – ≤ 6.12.*
- unaffected 6.18.35 – ≤ 6.18.*
- unaffected 7.0.12 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0 (opens in a new tab)
- https://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67a (opens in a new tab)
- https://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bd (opens in a new tab)
- https://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733d (opens in a new tab)
- https://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0feb (opens in a new tab)
- https://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7 (opens in a new tab)
- https://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deea (opens in a new tab)
- https://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecf (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-2026-45566 (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-2026-63993)Record last updated .