CVE-2026-23230High· 8.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.3%
8.8 → 6.3
high → medium
Last analysed / modified upstream
6.3 → 8.8
medium → high
0.3% → 0.3%
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.
Linux >= ebe98f1447bbccf8228335c62d86af02a0ed23f7 < 569fecc56bfe4df66f05734d67daef887746656bLinux >= ebe98f1447bbccf8228335c62d86af02a0ed23f7 < 4386f6af8aaedd0c5ad6f659b40cadcc8f423828Linux >= ebe98f1447bbccf8228335c62d86af02a0ed23f7 < 3eaa22d688311c708b73f3c68bc6d0c8e3f0f77aLinux >= ebe98f1447bbccf8228335c62d86af02a0ed23f7 < c4b9edd55987384a1f201d3d07ff71e448d79c1bLinux >= ebe98f1447bbccf8228335c62d86af02a0ed23f7 < 4cfa4c37dcbcfd70866e856200ed8a2894cac578Linux >= ebe98f1447bbccf8228335c62d86af02a0ed23f7 < ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241Linux 6.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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