CVE-2026-68300
In the Linux kernel, the following vulnerability has been resolved:
sctp: auth: verify auth requirement when auth_chunk is NULL
sctpauthchunk_verify() returns true unconditionally when
chunk->auth_chunk is NULL, silently skipping authentication.
This is incorrect when:
- skbclone() failed in the BH receive path, leaving authchunk
NULL. In sctpendpointbh_rcv() asoc is NULL for new
connections, so the early sctpauthrecv_cid() check cannot
catch this.
- No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never
called and auth_chunk remains NULL.
Fix by checking sctpauthrecvcid() when authchunk is NULL:
if authentication is required, return false to drop the chunk;
otherwise continue normally.
Package Versions Affected
Automatically patch vulnerabilities without upgrading
CVSS Version
Related Resources
References
https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a, https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646, https://git.kernel.org/stable/c/5a022ac51ad83b4ce6c898f4b9eefc65bd26b247, https://git.kernel.org/stable/c/6caf0e8590c0bf05a76b0d387726adf3a6f3725c, https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451, https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14, https://git.kernel.org/stable/c/a129792b3aef15002746c13522781d92ed3522c3, https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68300.json, https://nvd.nist.gov/vuln/detail/CVE-2026-68300, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git