sctp: auth: verify auth requirement when auth_chunk is NULL
In the Linux kernel, the following vulnerability has been resolved: sctp: auth: verify auth requirement when auth_chunk is NULL sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when: 1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this. 2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL. Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally.
CVE-2026-68300
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-2026-68300
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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "a129792b3aef15002746c13522781d92ed3522c3",
"versionType": "git"
},
{
"status": "affected",
"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "5a022ac51ad83b4ce6c898f4b9eefc65bd26b247",
"versionType": "git"
},
{
"status": "affected",
"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "6caf0e8590c0bf05a76b0d387726adf3a6f3725c",
"versionType": "git"
},
{
"status": "affected",
"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "ec2e157fc9678a9bc411305a25aec3fd337d7efb",
"versionType": "git"
},
{
"status": "affected",
"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "28c5fdce9dd955d2baf5e28987819b6d7cfaf646",
"versionType": "git"
},
{
"status": "affected",
"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "18957373920caf5cdaf5cf32e5d1d7a99ca7700a",
"versionType": "git"
},
{
"status": "affected",
"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "83f5031f2a6a49d696eb4cc0898345d12f9c6451",
"versionType": "git"
},
{
"status": "affected",
"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
"lessThan": "8e04823c120b376ef7dab14b60ebf6823aa16c14",
"versionType": "git"
}
],
"programFiles": [
"net/sctp/sm_statefuns.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": "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": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sctp/sm_statefuns.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68300
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #41692 · Revision 1
- Added to Heist Feed
- Publisher date