CVE-2025-21795NFSD: fix hang in nfsd4_shutdown_callback
- 7.5HighCVSS base score
- 0.67%Exploitation in 30 daysEPSS · top 48% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix hang in nfsd4_shutdown_callback If nfs4_client is in courtesy state then there is no point to send the callback. This causes nfsd4_shutdown_callback to hang since cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP notifies NFSD that the connection was dropped. This patch modifies nfsd4_run_cb_work to skip the RPC call if nfs4_client is in courtesy state.
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.67% · top 48% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 67ef9e5fd737eab2495f2586df7e9ea30caa1b77 – < abed68027ea3ab893ac85cc46a00e2e64a324239
- affected 26540b8940a2e21582afa61a6fb8af87310bac72 – < efa8a261c575f816c7e79a87aeb3ef8a0bd6b221
- affected 66af25799940b26efd41ea6e648f75c41a48a2c2 – < 38d345f612503b850c2973e5a879f88e441b34d7
- affected 66af25799940b26efd41ea6e648f75c41a48a2c2 – < 23ad7797c74cd8f7f90617f1e59a8703e2b43908
- affected 66af25799940b26efd41ea6e648f75c41a48a2c2 – < cedfbb92cf97a6bff3d25633001d9c44442ee854
- affected 66af25799940b26efd41ea6e648f75c41a48a2c2 – < e88d2451cd42e025465d6b51fd716a47b0b3800d
- affected 66af25799940b26efd41ea6e648f75c41a48a2c2 – < 036ac2778f7b28885814c6fbc07e156ad1624d03
- affected 5.10.220 – < 5.10.235
- affected 5.15.154 – < 5.15.179
- affected 5.19
- unaffected < 5.19
- unaffected 5.10.235 – ≤ 5.10.*
- unaffected 5.15.179 – ≤ 5.15.*
- unaffected 6.1.129 – ≤ 6.1.*
- unaffected 6.6.79 – ≤ 6.6.*
- unaffected 6.12.16 – ≤ 6.12.*
- unaffected 6.13.4 – ≤ 6.13.*
- unaffected 6.14 – ≤ *
References
References14
- https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239 (opens in a new tab)
- https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221 (opens in a new tab)
- https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7 (opens in a new tab)
- https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908 (opens in a new tab)
- https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854 (opens in a new tab)
- https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d (opens in a new tab)
- https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-5127 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-21795)Record last updated .