CVE-2026-98846sctp: check RCV_SHUTDOWN after the sendmsg connect wait
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: sctp: check RCV_SHUTDOWN after the sendmsg connect wait sctp_wait_for_connect() drops the socket lock while it sleeps. An out-of-the-blue ABORT can then be processed from the socket backlog and unlink the association. If a concurrent shutdown(fd, SHUT_RD) sets RCV_SHUTDOWN, the waiter breaks with err == 0 before checking asoc->base.dead. Its final sctp_association_put() can then free the association, leaving sctp_sendmsg_to_asoc() to continue with a dangling pointer. Check RCV_SHUTDOWN along with the wait error in sctp_sendmsg_to_asoc() before using the association again. The check only accesses the socket, so it needs no additional association reference. Return the existing -ESRCH so that sctp_sendmsg() skips freeing a new association that may already have been destroyed. Keep sctp_wait_for_connect() unchanged to preserve its behavior for the connect() caller.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from 668c9beb9020d5834ee9e43c208190a07d2b1928 before e8f972b1759d26bbefe4c524caae1ed7c8a593bd; from 668c9beb9020d5834ee9e43c208190a07d2b1928 before e701345d886e831fb593a0870d69c8c5de6fc938; 668c9beb9020d5834ee9e43c208190a07d2b1928 builds before 222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669; 668c9beb9020d5834ee9e43c208190a07d2b1928 builds before 4f1da630d13de0370e2f6361f961f1c8b384af1c | CNA record |
References
- https://git.kernel.org/stable/c/e8f972b1759d26bbefe4c524caae1ed7c8a593bd
- https://git.kernel.org/stable/c/e701345d886e831fb593a0870d69c8c5de6fc938
- https://git.kernel.org/stable/c/222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669
- https://git.kernel.org/stable/c/4f1da630d13de0370e2f6361f961f1c8b384af1c
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.