by Kastro
Paper/Archive/CVE-2026-64386

CVE-2026-64386

Linux Linux — smb: client: fix query_info() 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_info() replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_info_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 – < 100fb7c455fa86d248b8bd7bb9de757c192870b4100fb7c455fa86d248b8bd7bb9de757c192870b4CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 3c81dda84799f76b42aec598564316e2964440db3c81dda84799f76b42aec598564316e2964440dbCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < f1add4acb656f5a82806a1ab0e63fed3d8b1bfcaf1add4acb656f5a82806a1ab0e63fed3d8b1bfcaCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 89234773e8348918111aa15f6922b58cf384336489234773e8348918111aa15f6922b58cf3843364CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 2a88561d66eb855813cf004a0abe648bbb17de5e2a88561d66eb855813cf004a0abe648bbb17de5eCNA
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/100fb7c455fa86d248b8bd7bb9de757c192870b4refgit.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440dbrefgit.kernel.org/stable/c/f1add4acb656f5a82806a1ab0e63fed3d8b1bfcarefgit.kernel.org/stable/c/89234773e8348918111aa15f6922b58cf3843364refgit.kernel.org/stable/c/2a88561d66eb855813cf004a0abe648bbb17de5e