udp: fix potential use-after-free in tunnel segmentation
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head, the saved UDP header pointer is no longer valid.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.
CVE-2026-74705
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74705
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "6a733a38b983d8c2e222f13968209010cf44de87",
"versionType": "git"
},
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "19d89b13a43640b2da2f277ee462d919d988cb6f",
"versionType": "git"
},
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "b3df61bb745eb5201eac22679a2839d4ccbf3442",
"versionType": "git"
},
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "1ae134c012e10384cdac420b5cc6e0615cde0b55",
"versionType": "git"
},
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "5161e67c561c4f28a5d9335a6e859b02511de92b",
"versionType": "git"
},
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "64d322c288577793eedd352b96ef75234ed380fe",
"versionType": "git"
},
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "588d4a6795d99d080f74ef0b5f391ea8c453ae5d",
"versionType": "git"
},
{
"status": "affected",
"version": "dbef491ebe7f3a4fb1b9111878b86a426fd540b7",
"lessThan": "d0f86fb36eb260abd10007b62c9dcc1028e03e61",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/udp_offload.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/udp_offload.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74705
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #34277 · Revision 1
- Added to Heist Feed
- Publisher date