CVE-2026-43362: smb: client: fix in-place encryption corruption in SMB2_write()

DescriptionCVE.org

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.

• Linux · LinuxVersions not stated
• Linux · Linux4.11

Exploitation

Unlikely (under 1%). EPSS under 1%, or no score yet.

CISA KEV

Not listed

Public check

No public nuclei template

Weakness

Improper Synchronization · Race Conditions

Vendor

Linux

Published

May 2026

Band

Unlikely (under 1%), May 2026

• NVD entrynvd.nist.gov
• CVE recordcve.org
• Weakness CWE-662cwe.mitre.org
• git.kernel.org/stable/c/438e77435aee2894d5edf90be5c87004a57f6258git.kernel.org
• git.kernel.org/stable/c/52327268224fb9ccc7ecfbbdfdfff54b6e93c518git.kernel.org
• git.kernel.org/stable/c/92e64f1852f455f57d0850989e57c30d7fac7d95git.kernel.org
• git.kernel.org/stable/c/aea5e37388a080361110ab5790f57ae0af383650git.kernel.org
• git.kernel.org/stable/c/d78840a6a38d312dc1a51a65317bb67e46f0b929git.kernel.org