udp: fix potential use-after-free in tunnel segmentation
Summary
| CVE | CVE-2026-74705 |
|---|
| State | PUBLISHED |
|---|
| Assigner | Linux |
|---|
| Source Priority | CVE Program / NVD first with legacy fallback |
|---|
| Published | 2026-08-22 16:16:45 UTC |
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| Updated | 2026-08-22 16:16:45 UTC |
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| 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the saved UDP header pointer is no longer valid.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. |
|---|
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 6a733a38b983d8c2e222f13968209010cf44de87 git |
Not specified |
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 19d89b13a43640b2da2f277ee462d919d988cb6f git |
Not specified |
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 b3df61bb745eb5201eac22679a2839d4ccbf3442 git |
Not specified |
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 1ae134c012e10384cdac420b5cc6e0615cde0b55 git |
Not specified |
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 5161e67c561c4f28a5d9335a6e859b02511de92b git |
Not specified |
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 64d322c288577793eedd352b96ef75234ed380fe git |
Not specified |
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 588d4a6795d99d080f74ef0b5f391ea8c453ae5d git |
Not specified |
| CNA |
Linux |
Linux |
affected dbef491ebe7f3a4fb1b9111878b86a426fd540b7 d0f86fb36eb260abd10007b62c9dcc1028e03e61 git |
Not specified |
| CNA |
Linux |
Linux |
affected 4.6 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 4.6 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.10.265 5.10.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.15.216 5.15.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.183 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.152 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.104 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.45 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.1.9 7.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.