CVE-2026-64385smb: client: fix double-free in SMB2_ioctl() replay
- 9.8CriticalCVSS base score
- 0.46%Exploitation in 30 daysEPSS · top 60% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_ioctl() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_ioctl_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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.46% · top 60% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 433042a91f9373241307725b52de573933ffedbf – < 0be4bc64882edaefaaee8d1e27d083643eb778e6
- affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 96fcfc8ae7359346156e492ca610e830d2649ad6
- affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 276c8efbc49f9303ac76d0d4deab7128581b0f3b
- affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e – < fc65ffb4ef1bf540da16b17c225ae51091e07d72
- affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e – < f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9
- affected 6.6.32 – < 6.6.145
- affected 6.8
- unaffected < 6.8
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/0be4bc64882edaefaaee8d1e27d083643eb778e6 (opens in a new tab)
- https://git.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6 (opens in a new tab)
- https://git.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3b (opens in a new tab)
- https://git.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72 (opens in a new tab)
- https://git.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48929 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64385)Record last updated .