sctp: validate cookie AUTH state before use
In the Linux kernel, the following vulnerability has been resolved: sctp: validate cookie AUTH state before use When cookie authentication is disabled, COOKIE_ECHO restores fixed-size AUTH fields directly from peer-controlled cookie bytes. A forged RANDOM length, HMAC list, or CHUNKS list can then reach association consumers with lengths or identifiers that were never validated against the local backing arrays. A forged RANDOM length can cause out-of-bounds reads during key-vector construction. A forged HMAC identifier also caused a 32-byte write past a zero-length AUTH chunk, providing a primitive for a local privilege escalation chain. Validate the cookie's RANDOM, HMACS, and CHUNKS parameters at the cookie trust boundary before copying them into the association. Reject invalid types, malformed lengths, unsupported HMAC identifiers, HMAC lists without SHA1, and forbidden chunk ids.
CVE-2026-74752
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-2026-74752
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": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "4a4410de8dc6903d859c9e1731fc6dcee28bd072",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "7f17984cfa697613800eb693e183b06884129bd3",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "88619b117be1daf633ce32210570ce35a0bd1c98",
"versionType": "git"
},
{
"status": "affected",
"version": "1f485649f52929d9937b346a920a522a7363e202",
"lessThan": "3dbb44d88b1e94dd31fe43588af7437b34b44d56",
"versionType": "git"
}
],
"programFiles": [
"include/net/sctp/auth.h",
"net/sctp/auth.c",
"net/sctp/sm_make_chunk.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.24"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.24",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/sctp/auth.h",
"net/sctp/auth.c",
"net/sctp/sm_make_chunk.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74752
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #46600 · Revision 1
- Added to Heist Feed
- Publisher date