CVE-2026-31608
smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
Description
In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list() smb_direct_flush_send_list() already calls smb_direct_free_sendmsg(), so we should not call it again after post_sendmsg() moved it to the batch list.
INFO
Published Date :
April 24, 2026, 3:16 p.m.
Last Modified :
April 29, 2026, 8:03 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to a version with the fix.
- Avoid double-free in smb_direct_free_sendmsg.
- Remove redundant call after smb_direct_flush_send_list().
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-31608.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31608 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31608
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31608 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-31608 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 29, 2026
Action Type Old Value New Value Added CWE CWE-415 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.14 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 7.0 up to (excluding) 7.0.1 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 6.18.24 Added Reference Type kernel.org: https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 27, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/84ff995ae826aa6bbcc6c7b9ea569ff67c021d72 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 24, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list() smb_direct_flush_send_list() already calls smb_direct_free_sendmsg(), so we should not call it again after post_sendmsg() moved it to the batch list. Added Reference https://git.kernel.org/stable/c/2ba03f46132b0d1a7bafb86e1ef61951a2254023 Added Reference https://git.kernel.org/stable/c/6968c91fab05b8fc4d6700e0cf34472bb422df25 Added Reference https://git.kernel.org/stable/c/830de6eeb9db4cb7e758201fb99328ef4ca4b032