VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98846: Linux kernel · sctp: check RCV_SHUTDOWN after the sendmsg connect wait

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e701345d886e831fb593a0870d69c8c5de6fc938 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e701345d886e831fb593a0870d69c8c5de6fc938, e8f972b1759d26bbefe4c524caae1ed7c8a593bd, 222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 668c9beb9020d5834ee9e43c208190a07d2b1928, < e701345d886e831fb593a0870d69c8c5de6fc938	Fixed in e701345d886e831fb593a0870d69c8c5de6fc938
LinuxLinux	Affected ≥ 668c9beb9020d5834ee9e43c208190a07d2b1928, < e8f972b1759d26bbefe4c524caae1ed7c8a593bd	Fixed in e8f972b1759d26bbefe4c524caae1ed7c8a593bd
LinuxLinux	Affected ≥ 668c9beb9020d5834ee9e43c208190a07d2b1928, < 222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669	Fixed in 222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669
LinuxLinux	Affected ≥ 668c9beb9020d5834ee9e43c208190a07d2b1928, < 4f1da630d13de0370e2f6361f961f1c8b384af1c	Fixed in 4f1da630d13de0370e2f6361f961f1c8b384af1c
LinuxLinux	Affected ≥ 668c9beb9020d5834ee9e43c208190a07d2b1928, < 1bef1944ef15a40797305bf916827b04df6307ca	Fixed in 1bef1944ef15a40797305bf916827b04df6307ca
LinuxLinux	Affected =4.16	Fixed in–

Description

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.

References

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