by Kastro
Paper/Archive/CVE-2026-31609

CVE-2026-31609

Linux Linux — smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 39.6.396 × 207.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Linuxcca0526ef2344cab6944d7f441fc24e152da031b – < a9940dcbe5cb92482c04efc7341039ddf7dbf607a9940dcbe5cb92482c04efc7341039ddf7dbf607CNA
Linux37b5c06956183b65e6808b509cf637632016cdf7 – < 22b7c1c619d808aec4cad3dc42103345e370d10722b7c1c619d808aec4cad3dc42103345e370d107CNA
Linux21538121efe6c8c5b51c742fa02cbe820bc48714 – < f9a162c2bbcd0ac85bd07c5b37cf20286048b65cf9a162c2bbcd0ac85bd07c5b37cf20286048b65cCNA
Linux21538121efe6c8c5b51c742fa02cbe820bc48714 – < 27b7c3e916218b5eb2ee350211140e961bfc49be27b7c3e916218b5eb2ee350211140e961bfc49beCNA
Linux6.18.11 – < 6.18.246.18.24CNA
Linux6.19.1 – < 6.19.146.19.14CNA
Linux7.07.0.1CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgit.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607refgit.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107refgit.kernel.org/stable/c/f9a162c2bbcd0ac85bd07c5b37cf20286048b65crefgit.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be