by Kastro
Paper/Archive/CVE-2026-64387

CVE-2026-64387

Linux Linux — smb: client: fix query directory replay double-free

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 39.6.396 × 207.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Linux433042a91f9373241307725b52de573933ffedbf – < 3409aedf3c81a810243da94164f6621c9d205c983409aedf3c81a810243da94164f6621c9d205c98CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 1665f25b1dea30bf2d02e16245d203a944c9d9941665f25b1dea30bf2d02e16245d203a944c9d994CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 00b0fa425941438b664950a8ee65dfba2def433600b0fa425941438b664950a8ee65dfba2def4336CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 3317a5d015fca976475aa71df224056777316fde3317a5d015fca976475aa71df224056777316fdeCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 9647492b5e41954be59d5157eddbcd4cdc1656f79647492b5e41954be59d5157eddbcd4cdc1656f7CNA
Linux6.6.32 – < 6.6.1456.6.145CNA
Linux6.86.6.145CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgit.kernel.org/stable/c/3409aedf3c81a810243da94164f6621c9d205c98refgit.kernel.org/stable/c/1665f25b1dea30bf2d02e16245d203a944c9d994refgit.kernel.org/stable/c/00b0fa425941438b664950a8ee65dfba2def4336refgit.kernel.org/stable/c/3317a5d015fca976475aa71df224056777316fderefgit.kernel.org/stable/c/9647492b5e41954be59d5157eddbcd4cdc1656f7