Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-64383

smb: client: fix double-free in SMB2_flush() replay
Back to all
CVE

CVE-2026-64383

smb: client: fix double-free in SMB2_flush() replay

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix double-free in SMB2_flush() replay

SMB2_flush() keeps its response buffer bookkeeping across replay

attempts. If a replayable flush response is received and the retry then

fails before cifssendrecv() stores a replacement response, flush_exit

will free the stale response pointer a second time.

Reinitialize respbuftype and rspiov at the top of the replay loop so

cleanup only acts on response state produced by the current attempt.

This fixes a double-free without changing replay handling for successful

requests.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/013a9a3da46c5dabcf18f65ea6a47874ba12a15d, https://git.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adaf, https://git.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a, https://git.kernel.org/stable/c/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb, https://git.kernel.org/stable/c/878757163eea684750107a31ea134c103863515d, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64383.json, https://nvd.nist.gov/vuln/detail/CVE-2026-64383, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00457%
EPSS Percentile
0.38809%
Introduced Version
433042a91f9373241307725b52de573933ffedbf,4f1fffa2376922f3d1d506e49c0fd445b023a28e,6.6.32,0,6.7.0,6.8.0,6.13.0
Fix Available
6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb,4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a,6.6.145,6.12.96,6.18.39,7.1.4,6.12.100-1~deb12u1,6.12.96-1,7.0.0-1012.12~24.04.1,7.0.0-1011.11~24.04.1,7.0.0-31.31~24.04.1,7.0.0-1018.18~24.04.1,7.0.0-31.31.1~24.04.1,0:6.12.0-206.104.3.3.el9uek,0:6.12.0-206.104.3.3.el10uek,1:6.18.39-79.141.amzn2023,1:1.0-0.amzn2023,1:6.12.100-125.179.amzn2023

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading