CVE-2026-43362smb: client: fix in-place encryption corruption in SMB2_write()
- 8.1HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 82% 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 in-place encryption corruption in SMB2_write() SMB2_write() places write payload in iov[1..n] as part of rq_iov. smb3_init_transform_rq() pointer-shares rq_iov, so crypt_message() encrypts iov[1] in-place, replacing the original plaintext with ciphertext. On a replayable error, the retry sends the same iov[1] which now contains ciphertext instead of the original data, resulting in corruption. The corruption is most likely to be observed when connections are unstable, as reconnects trigger write retries that re-send the already-encrypted data. This affects SFU mknod, MF symlinks, etc. On kernels before 6.10 (prior to the netfs conversion), sync writes also used this path and were similarly affected. The async write path wasn't unaffected as it uses rq_iter which gets deep-copied. Fix by moving the write payload into rq_iter via iov_iter_kvec(), so smb3_init_transform_rq() deep-copies it before encryption.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 5 months later
· 5 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 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 82% 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 8.1.
Affected products
- affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 – < 438e77435aee2894d5edf90be5c87004a57f6258
- affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 – < 52327268224fb9ccc7ecfbbdfdfff54b6e93c518
- affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 – < 92e64f1852f455f57d0850989e57c30d7fac7d95
- affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 – < aea5e37388a080361110ab5790f57ae0af383650
- affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 – < d78840a6a38d312dc1a51a65317bb67e46f0b929
- affected 4.11
- unaffected < 4.11
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References5
- https://git.kernel.org/stable/c/438e77435aee2894d5edf90be5c87004a57f6258 (opens in a new tab)
- https://git.kernel.org/stable/c/52327268224fb9ccc7ecfbbdfdfff54b6e93c518 (opens in a new tab)
- https://git.kernel.org/stable/c/92e64f1852f455f57d0850989e57c30d7fac7d95 (opens in a new tab)
- https://git.kernel.org/stable/c/aea5e37388a080361110ab5790f57ae0af383650 (opens in a new tab)
- https://git.kernel.org/stable/c/d78840a6a38d312dc1a51a65317bb67e46f0b929 (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-2026-28668 (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-2026-43362)Record last updated .