Description
In the Linux kernel, the following vulnerability has been resolved:
nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()
Lei Lu recently reported that nfsd4_setclientid_confirm() did not check the return value from get_client_locked(). a SETCLIENTID_CONFIRM could race with a confirmed client expiring and fail to get a reference. That could later lead to a UAF.
Fix this by getting a reference early in the case where there is an extant confirmed client. If that fails then treat it as if there were no confirmed client found at all.
In the case where the unconfirmed client is expiring, just fail and return the result from get_client_locked().
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < 3f252a73e81aa01660cb426735eab932e6182e8d; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < d35ac850410966010e92f401f4e21868a9ea4d8b; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < f3aac6cf390d8b80e1d82975faf4ac61175519c0; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < 22f45cedf281e6171817c8a3432c44d788c550e1; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < d71abd1ae4e0413707cd42b10c24a11d1aa71772; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < 74ad36ed60df561a303a19ecef400c7096b20306; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < 36e83eda90e0e4ac52f259f775b40b2841f8a0a3; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < 571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1; >= d20c11d86d8f821a64eac7d6c8f296f06d935f4f, < 908e4ead7f757504d8b345452730636e298cbf68 |
| Linux | Linux | 3.17 |
| Siemens | SIMATIC CN 4100 | < V5.0 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
References
- https://git.kernel.org/stable/c/22f45cedf281e6171817c8a3432c44d788c550e1Patch
- https://git.kernel.org/stable/c/36e83eda90e0e4ac52f259f775b40b2841f8a0a3Patch
- https://git.kernel.org/stable/c/3f252a73e81aa01660cb426735eab932e6182e8dPatch
- https://git.kernel.org/stable/c/571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1Patch
- https://git.kernel.org/stable/c/74ad36ed60df561a303a19ecef400c7096b20306Patch
- https://git.kernel.org/stable/c/908e4ead7f757504d8b345452730636e298cbf68Patch
- https://git.kernel.org/stable/c/d35ac850410966010e92f401f4e21868a9ea4d8bPatch
- https://git.kernel.org/stable/c/d71abd1ae4e0413707cd42b10c24a11d1aa71772Patch
- https://git.kernel.org/stable/c/f3aac6cf390d8b80e1d82975faf4ac61175519c0Patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
Timeline
- Published
- Sep 4, 2025
- Last modified
- Oct 19, 2026
- NVD status
- Modified