smb: client: fix in-place encryption corruption in SMB2_write()

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Summary

CVECVE-2026-43362
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:47 UTC
Updated2026-05-11 08:16:11 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

EPSS: 0.000100000 probability, percentile 0.012390000 (date 2026-05-10)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 438e77435aee2894d5edf90be5c87004a57f6258 git Not specified
CNA Linux Linux affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 52327268224fb9ccc7ecfbbdfdfff54b6e93c518 git Not specified
CNA Linux Linux affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 92e64f1852f455f57d0850989e57c30d7fac7d95 git Not specified
CNA Linux Linux affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 aea5e37388a080361110ab5790f57ae0af383650 git Not specified
CNA Linux Linux affected 026e93dc0a3eefb0be060bcb9ecd8d7a7fd5c398 d78840a6a38d312dc1a51a65317bb67e46f0b929 git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aea5e37388a080361110ab5790f57ae0af383650 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/52327268224fb9ccc7ecfbbdfdfff54b6e93c518 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/438e77435aee2894d5edf90be5c87004a57f6258 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/92e64f1852f455f57d0850989e57c30d7fac7d95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d78840a6a38d312dc1a51a65317bb67e46f0b929 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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