CVE-2026-45983
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: never defer requests during idmap lookup During v4 request compound arg decoding, some ops (e.g. SETATTR) can trigger idmap lookup upcalls. When those upcall responses get delayed beyond the allowed time limit, cache_check() will mark the request for deferral and cause it to be dropped. This prevents nfs4svc_encode_compoundres from being executed, and thus the session slot flag NFSD4_SLOT_INUSE never gets cleared. Subsequent client requests will fail with NFSERR_JUKEBOX, given that the slot will be marked as in-use, making the SEQUENCE op fail. Fix this by making sure that the RQ_USEDEFERRAL flag is always clear during nfs4svc_decode_compoundargs(), since no v4 request should ever be deferred.
How to fix
- linux linux_kernel5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4 or later
- git.kernel.org/stable/c/063a6f22478ef929625000a2caf54667725c1dfd
- git.kernel.org/stable/c/243f71ed873ff3feeb6f9b5cb145d63f7188b4c4
- git.kernel.org/stable/c/3a72c7dedc99b321e0f267e4e999e5baf07c4593
- git.kernel.org/stable/c/8dff54fe88c0dcd4c55bff9fc2fa6ca968290826
- git.kernel.org/stable/c/99e17b20fddac19a228d213e00f6b9e1c10daff9
- git.kernel.org/stable/c/b9abb760db20504240a7147f27934d900cd80b23
- git.kernel.org/stable/c/d75ec4504a4340b033b15cad0303988b3089dd93
- git.kernel.org/stable/c/f9c206cdc4266caad6a9a7f46341420a10f03ccb
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.30 ≤ v < 5.10.252, 5.11 ≤ v < 5.15.202, 5.16 ≤ v < 6.1.165, 6.2 ≤ v < 6.6.128, 6.7 ≤ v < 6.12.75, 6.13 ≤ v < 6.18.14, 6.19 ≤ v < 6.19.4 | 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.