CVE-2026-31609 | In the Linux kernel, the following vulnerability has been re… | CVSS 9.8 CRITICAL

Description

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.

Metadata

CVE ID: CVE-2026-31609
State: PUBLISHED
Assigner: Linux
Reserved: 2026-03-09 15:48 UTC
Published: 2026-04-24 14:42 UTC
Last updated: 2026-06-14 17:42 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	cca0526ef2344cab6944d7f441fc24e152da031b < a9940dcbe5cb92482c04efc7341039ddf7dbf607, 37b5c06956183b65e6808b509cf637632016cdf7 < 22b7c1c619d808aec4cad3dc42103345e370d107, 21538121efe6c8c5b51c742fa02cbe820bc48714 < f9a162c2bbcd0ac85bd07c5b37cf20286048b65c, 21538121efe6c8c5b51c742fa02cbe820bc48714 < 27b7c3e916218b5eb2ee350211140e961bfc49be …
Linux	Linux	—	7.0, 0 < 7.0, 6.18.24 ≤ 6.18., 6.19.14 ≤ 6.19. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (4)