Critical 9.8Published Apr 24, 2026

CVE-2026-31536smb: server: let send_done handle a completion without IB_SEND_SIGNALED

Updated under an hour ago (Oct 28, 2026, 2:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: smb: server: let send_done handle a completion without IB_SEND_SIGNALED With smbdirect_send_batch processing we likely have requests without IB_SEND_SIGNALED, which will be destroyed in the final request that has IB_SEND_SIGNALED set. If the connection is broken all requests are signaled even without explicit IB_SEND_SIGNALED.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 0626e6641f6b467447c81dd7678a69c66f7746cf before 24082642654f3e5149913946e89c00a297a8868f; from 0626e6641f6b467447c81dd7678a69c66f7746cf before e38b415c024bc3b6321bf8650dbf3f4aab8e74b3; 0626e6641f6b467447c81dd7678a69c66f7746cf builds before 9da82dc73cb03e85d716a2609364572367a5ff47	CNA record
linux linux_kernel linux:linux_kernel	from 5.15 before 6.18.11; from 6.19 before 6.19.1	NVD

References

References

https://git.kernel.org/stable/c/24082642654f3e5149913946e89c00a297a8868f	patch
https://git.kernel.org/stable/c/e38b415c024bc3b6321bf8650dbf3f4aab8e74b3	patch
https://git.kernel.org/stable/c/9da82dc73cb03e85d716a2609364572367a5ff47	patch

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.