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High severity8.1NVD Advisory· Published May 8, 2026· Updated May 15, 2026

CVE-2026-43362

CVE-2026-43362

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.

Affected products

74

Patches

Vulnerability mechanics

References

5

News mentions

0

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