CVE-2026-31609
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-31609
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-31609.html
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/f9a162c2bbcd0ac85bd07c5b37cf20286048b65c
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.19.14-1 |
| debian | sid | fixed | 6.19.14-1 |
| debian | trixie | fixed | 0 |
| linux-kernel | affected | 6.18.24 |
References
- https://git.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107
- https://git.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be
- https://git.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607
- https://git.kernel.org/stable/c/f9a162c2bbcd0ac85bd07c5b37cf20286048b65c
- https://www.suse.com/security/cve/CVE-2026-31609.html
- https://security-tracker.debian.org/tracker/CVE-2026-31609
CWEs
CWE-415
Verify integrity in audit chain (admin only). AS-IS.