Critical 9.8Published Apr 24, 2026

CVE-2026-31609smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()

Updated under an hour ago (Oct 27, 2026, 2:50 PM 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: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush() smbd_send_batch_flush() already calls smbd_free_send_io(), so we should not call it again after smbd_post_send() moved it to the batch list.

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): CWE-415
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: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from cca0526ef2344cab6944d7f441fc24e152da031b before a9940dcbe5cb92482c04efc7341039ddf7dbf607; 37b5c06956183b65e6808b509cf637632016cdf7 builds before 22b7c1c619d808aec4cad3dc42103345e370d107; from 21538121efe6c8c5b51c742fa02cbe820bc48714 before f9a162c2bbcd0ac85bd07c5b37cf20286048b65c; 21538121efe6c8c5b51c742fa02cbe820bc48714 builds before 27b7c3e916218b5eb2ee350211140e961bfc49be; from 6.18.11 before 6.18.24; from 6.19.1 before 6.19.14	CNA record
linux linux_kernel linux:linux_kernel	before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1	NVD

References

References

https://git.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607	patch
https://git.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107	patch
https://git.kernel.org/stable/c/f9a162c2bbcd0ac85bd07c5b37cf20286048b65c	patch
https://git.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be	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.