Answer in brief
CVE-2026-23230 records a High severity (CVSS 8.8) vulnerability in smb: client: split cached_fid bitfields to avoid shared-byte RMW races. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <569fecc56bfe4df66f05734d67daef887746656b || >=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <4386f6af8aaedd0c5ad6f659b40cadcc8f423828 || >=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a || >=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <c4b9edd55987384a1f201d3d07ff71e448d79c1b || >=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <4cfa4c37dcbcfd70866e856200ed8a2894cac578 || >=ebe98f1447bbccf8228335c62d86af02a0ed23f7 <ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241 | 569fecc56bfe4df66f05734d67daef887746656b, 4386f6af8aaedd0c5ad6f659b40cadcc8f423828, 3eaa22d688311c708b73f3c68bc6d0c8e3f0f77a, c4b9edd55987384a1f201d3d07ff71e448d79c1b, 4cfa4c37dcbcfd70866e856200ed8a2894cac578, ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241 |
| Linux/Linuxgeneric | 6.1 | Not reported |
| Siemens/RUGGEDCOM RST2428Pgeneric | >=0 <V4.0 | V4.0 |
Published upstream
Feb 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
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.
Quoted source text, attributed separately from HOL analysis.