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CVE-2026-68300

CRITICALCVSS 9.8/10EPSS 0.53%

Last modified

CVE-2026-68300 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.53%

42.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= bbd0d59809f923ea2b540cbd781b32110e249f6e, < a129792b3aef15002746c13522781d92ed3522c3; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 5a022ac51ad83b4ce6c898f4b9eefc65bd26b247; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 6caf0e8590c0bf05a76b0d387726adf3a6f3725c; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < ec2e157fc9678a9bc411305a25aec3fd337d7efb; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 28c5fdce9dd955d2baf5e28987819b6d7cfaf646; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 18957373920caf5cdaf5cf32e5d1d7a99ca7700a; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 83f5031f2a6a49d696eb4cc0898345d12f9c6451; >= bbd0d59809f923ea2b540cbd781b32110e249f6e, < 8e04823c120b376ef7dab14b60ebf6823aa16c14
LinuxLinux2.6.24

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-68300?
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.
How severe is CVE-2026-68300?
CVE-2026-68300 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.
How do I fix CVE-2026-68300?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST