CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
- 10.0CriticalCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% 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: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 55 days later
· 55 days 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 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% 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 10.0.
Affected products
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 6a733a38b983d8c2e222f13968209010cf44de87
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 19d89b13a43640b2da2f277ee462d919d988cb6f
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < b3df61bb745eb5201eac22679a2839d4ccbf3442
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 1ae134c012e10384cdac420b5cc6e0615cde0b55
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 5161e67c561c4f28a5d9335a6e859b02511de92b
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 64d322c288577793eedd352b96ef75234ed380fe
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < 588d4a6795d99d080f74ef0b5f391ea8c453ae5d
- affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 – < d0f86fb36eb260abd10007b62c9dcc1028e03e61
- affected 4.6
- unaffected < 4.6
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.152 – ≤ 6.6.*
- unaffected 6.12.104 – ≤ 6.12.*
- unaffected 6.18.45 – ≤ 6.18.*
- unaffected 7.1.9 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87 (opens in a new tab)
- https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f (opens in a new tab)
- https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442 (opens in a new tab)
- https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55 (opens in a new tab)
- https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b (opens in a new tab)
- https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe (opens in a new tab)
- https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d (opens in a new tab)
- https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61 (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-2026-64392 (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-2026-74705)Record last updated .