by Kastro
Paper/Archive/CVE-2026-64597

CVE-2026-64597

Linux Linux — smb: client: fix double-free in SMB2_close() replay

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
35
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 29.6.296 × 205.9No 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 double-free in SMB2_close() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_close_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 – < 037511726228aaf165c7067ff2bfc88eaecdf1f3037511726228aaf165c7067ff2bfc88eaecdf1f3CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 0aa97edf7c347c0f54e7e60c4740574b8120c66a0aa97edf7c347c0f54e7e60c4740574b8120c66aCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < d15d83125007f673aec4323e1bbbaaffbe87ea13d15d83125007f673aec4323e1bbbaaffbe87ea13CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < b18ed621dbfceecea5539848cddcb9272c9a61e1b18ed621dbfceecea5539848cddcb9272c9a61e1CNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < f96e1cdcb63ed3321142ff2fcdf784e32cda8feef96e1cdcb63ed3321142ff2fcdf784e32cda8feeCNA
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/037511726228aaf165c7067ff2bfc88eaecdf1f3refgit.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66arefgit.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13refgit.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1refgit.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee