Critical 9.8Published Jul 25, 2026

CVE-2026-64387smb: client: fix query directory replay double-free

Updated under an hour ago (Oct 26, 2026, 8:10 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_directory_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-415
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	433042a91f9373241307725b52de573933ffedbf builds before 3409aedf3c81a810243da94164f6621c9d205c98; from 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 1665f25b1dea30bf2d02e16245d203a944c9d994; 4f1fffa2376922f3d1d506e49c0fd445b023a28e builds before 00b0fa425941438b664950a8ee65dfba2def4336; from 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 3317a5d015fca976475aa71df224056777316fde; from 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 9647492b5e41954be59d5157eddbcd4cdc1656f7; from 6.6.32 before 6.6.145	CNA record
linux linux_kernel linux:linux_kernel	from 6.6.32 before 6.6.145; from 6.8.1 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4; 6.8; 6.8; 6.8; 6.8; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/3409aedf3c81a810243da94164f6621c9d205c98	patch
https://git.kernel.org/stable/c/1665f25b1dea30bf2d02e16245d203a944c9d994	patch
https://git.kernel.org/stable/c/00b0fa425941438b664950a8ee65dfba2def4336	patch
https://git.kernel.org/stable/c/3317a5d015fca976475aa71df224056777316fde	patch
https://git.kernel.org/stable/c/9647492b5e41954be59d5157eddbcd4cdc1656f7	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.