CVE-2026-43362

HIGH EPSS 12.1%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
8.1 CVSS 3.1
High
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.1
Exploitability
2.8
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
12.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥4.11  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/438e77435aee2894d5edf90be5c87004a57f6258
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52327268224fb9ccc7ecfbbdfdfff54b6e93c518
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92e64f1852f455f57d0850989e57c30d7fac7d95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aea5e37388a080361110ab5790f57ae0af383650
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d78840a6a38d312dc1a51a65317bb67e46f0b929
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/438e77435aee2894d5edf90be5c87004a57f6258
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52327268224fb9ccc7ecfbbdfdfff54b6e93c518
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92e64f1852f455f57d0850989e57c30d7fac7d95
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aea5e37388a080361110ab5790f57ae0af383650
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d78840a6a38d312dc1a51a65317bb67e46f0b929
    Patch