CVE-2026-64381smb: client: Fix next buffer leak in receive_encrypted_standard()
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% 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 next buffer leak in receive_encrypted_standard() receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked. Move the MAX_COMPOUND check before allocating next_buffer.
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 |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 94e4f672db029414b9888b5137a7559f1febf2d8
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 68fc0b6cc03ca58060c0f36454e169f5fe258974
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 07e0ab81df1790afa35732a4e8e07ff831b29008
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 9136a08dc29328edd9867f2545e73906ac9df93b
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 67097772df7791c53d608f04bd31c676ccf79b83
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 297243e365fc9fe2f8e9b7dd535a65d922cd108b
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 927d4805aea0a287d36dd4f826ee24d69a2afee3
- affected b24df3e30cbf48255db866720fb71f14bf9d2f39 – < 1c6267a1d5cf4c73b656f8181b310cbbb3e4767b
- affected 4.19
- unaffected < 4.19
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- 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
References8
- https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8 (opens in a new tab)
- https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974 (opens in a new tab)
- https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008 (opens in a new tab)
- https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b (opens in a new tab)
- https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83 (opens in a new tab)
- https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b (opens in a new tab)
- https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3 (opens in a new tab)
- https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b (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-2026-48925 (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-2026-64381)Record last updated .