CVE-2026-23230
8.8 HIGHIn the Linux kernel, the following vulnerability has been resolved: smb: client: split cached_fid bitfields to avoid shared-byte RMW rac...
Published: 2026-02-18 · Last updated: 2026-06-02
Severity and scoring
- CVSS
- 8.8 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-23230
- [Patch]https://git.kernel.org/stable/c/3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a
- [Patch]https://git.kernel.org/stable/c/4386f6af8aaedd0c5ad6f659b40cadcc8f423828
- [Patch]https://git.kernel.org/stable/c/4cfa4c37dcbcfd70866e856200ed8a2894cac578
- [Patch]https://git.kernel.org/stable/c/569fecc56bfe4df66f05734d67daef887746656b
- [Patch]https://git.kernel.org/stable/c/c4b9edd55987384a1f201d3d07ff71e448d79c1b
- [Patch]https://git.kernel.org/stable/c/ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241
- [Other]https://cert-portal.siemens.com/productcert/html/ssa-253495.html
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