CVE-2026-23230

Description

In the Linux kernel, the following vulnerability has been resolved:smb: client: split cached_fid bitfields to avoid shared-byte RMW racesis_open, has_lease and on_list are stored in the same bitfield byte instruct cached_fid but are updated in different code paths that may runconcurrently. Bitfield assignments generate byte readmodifywriteoperations (e.g. orb $mask, addr on x86_64), so updating one flag canrestore stale values of the others.A possible interleaving is: CPU1: load old byte (has_lease=1, on_list=1) CPU2: clear both flags (store 0) CPU1: RMW store (old | IS_OPEN) -> reintroduces cleared bitsTo avoid this class of races, convert these flags to separate boolfields.

Risk Information

Base Score

8.4

MODERATE

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score

Exploitation Probability

0.032

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234