CVE-2026-43362

A flaw was found in the Linux kernel's Server Message Block (SMB) client. This vulnerability allows a remote attacker to cause data corruption. When an SMB client attempts to write data over an unstable connection, the in-place encryption process can lead to already encrypted data being re-sent during write retries. This results in the original plaintext being replaced by ciphertext, causing data integrity issues.

Red Hat acknowledges the upstream Linux kernel correction for «smb» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the cifs module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.