CVE-2026-23230 - smb: client: split cached_fid bitfields to avoid shared-byte RMW races

CVE-2026-23230 - smb: client: split cached_fid bitfields to avoid shared-byte RMW races

https://cvefeed.io/rssfeed/latest.atom / Wed, 02/18/2026 - 20:02
CVE ID : CVE-2026-23230
Published : Feb. 18, 2026, 4:22 p.m. | 2 hours ago
Description : In the Linux kernel, the following vulnerability has been resolved: smb: client: split cached_fid bitfields to avoid shared-byte RMW races is_open, has_lease and on_list are stored in the same bitfield byte in struct cached_fid but are updated in different code paths that may run concurrently. Bitfield assignments generate byte read–modify–write operations (e.g. `orb $mask, addr` on x86_64), so updating one flag can restore 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 bits To avoid this class of races, convert these flags to separate bool fields.
Severity: 0.0 | NA
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