Tracker / CVE-2026-23230
CVE-2026-23230
High 8.8
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.
Affected products and versions
| linux | linux_kernel · 6.1 → 6.1.164 |
|---|---|
| linux | linux_kernel · 6.13 → 6.18.11 |
| linux | linux_kernel · 6.19 → 6.19.1 |
| linux | linux_kernel · 6.2 → 6.6.125 |
| linux | linux_kernel · 6.7 → 6.12.72 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.