Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking Affecting kernel-rt-64k-debug-devel-matched package, versions *


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.01% (2nd percentile)

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  • Snyk IDSNYK-RHEL9-KERNELRT64KDEBUGDEVELMATCHED-16580710
  • published9 May 2026
  • disclosed8 May 2026

Introduced: 8 May 2026

NewCVE-2026-43362  (opens in a new tab)
CWE-649  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:9 kernel-rt-64k-debug-devel-matched.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-64k-debug-devel-matched package and not the kernel-rt-64k-debug-devel-matched package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1