CVE-2022-50241
NFSD: fix use-after-free on source server when doing inter-server copy
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix use-after-free on source server when doing inter-server copy Use-after-free occurred when the laundromat tried to free expired cpntf_state entry on the s2s_cp_stateids list after inter-server copy completed. The sc_cp_list that the expired copy state was inserted on was already freed. When COPY completes, the Linux client normally sends LOCKU(lock_state x), FREE_STATEID(lock_state x) and CLOSE(open_state y) to the source server. The nfs4_put_stid call from nfsd4_free_stateid cleans up the copy state from the s2s_cp_stateids list before freeing the lock state's stid. However, sometimes the CLOSE was sent before the FREE_STATEID request. When this happens, the nfsd4_close_open_stateid call from nfsd4_close frees all lock states on its st_locks list without cleaning up the copy state on the sc_cp_list list. When the time the FREE_STATEID arrives the server returns BAD_STATEID since the lock state was freed. This causes the use-after-free error to occur when the laundromat tries to free the expired cpntf_state. This patch adds a call to nfs4_free_cpntf_statelist in nfsd4_close_open_stateid to clean up the copy state before calling free_ol_stateid_reaplist to free the lock state's stid on the reaplist.
Timeline
ID reserved
By Linux
Published
- 13 months later
· 13 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 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.37% · top 69% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Weakness
Affected products
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < bbacfcde5fff25ac22597e8373a065c647da6738
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 83b94969751a691347606dbe6b1865efcfa5a643
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 6ea71246b7a02af675d733e72d14bd0d591d5f4a
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 35aa0fb8c3033a3d78603356e96fc18c5b9cceb2
- affected 624322f1adc58acd0b69f77a6ddc764207e97241 – < 019805fea91599b22dfa62ffb29c022f35abeb06
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.150 – ≤ 5.10.*
- unaffected 5.15.75 – ≤ 5.15.*
- unaffected 5.19.17 – ≤ 5.19.*
- unaffected 6.0.3 – ≤ 6.0.*
- unaffected 6.1 – ≤ *
References (5)
- https://git.kernel.org/stable/c/bbacfcde5fff25ac22597e8373a065c647da6738 (opens in a new tab)
- https://git.kernel.org/stable/c/83b94969751a691347606dbe6b1865efcfa5a643 (opens in a new tab)
- https://git.kernel.org/stable/c/6ea71246b7a02af675d733e72d14bd0d591d5f4a (opens in a new tab)
- https://git.kernel.org/stable/c/35aa0fb8c3033a3d78603356e96fc18c5b9cceb2 (opens in a new tab)
- https://git.kernel.org/stable/c/019805fea91599b22dfa62ffb29c022f35abeb06 (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)
- 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://trackcve.app/cve/CVE-2022-50241)Record last updated .