CVE-2022-50241 (GCVE-0-2022-50241)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:01 – Updated: 2025-12-23 13:27
VLAI?
Title
NFSD: fix use-after-free on source server when doing inter-server copy
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < bbacfcde5fff25ac22597e8373a065c647da6738 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 83b94969751a691347606dbe6b1865efcfa5a643 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 6ea71246b7a02af675d733e72d14bd0d591d5f4a (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 35aa0fb8c3033a3d78603356e96fc18c5b9cceb2 (git)
Affected: 624322f1adc58acd0b69f77a6ddc764207e97241 , < 019805fea91599b22dfa62ffb29c022f35abeb06 (git)
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    Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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              "status": "unaffected",
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: fix use-after-free on source server when doing inter-server copy\n\nUse-after-free occurred when the laundromat tried to free expired\ncpntf_state entry on the s2s_cp_stateids list after inter-server\ncopy completed. The sc_cp_list that the expired copy state was\ninserted on was already freed.\n\nWhen COPY completes, the Linux client normally sends LOCKU(lock_state x),\nFREE_STATEID(lock_state x) and CLOSE(open_state y) to the source server.\nThe nfs4_put_stid call from nfsd4_free_stateid cleans up the copy state\nfrom the s2s_cp_stateids list before freeing the lock state\u0027s stid.\n\nHowever, sometimes the CLOSE was sent before the FREE_STATEID request.\nWhen this happens, the nfsd4_close_open_stateid call from nfsd4_close\nfrees all lock states on its st_locks list without cleaning up the copy\nstate on the sc_cp_list list. When the time the FREE_STATEID arrives the\nserver returns BAD_STATEID since the lock state was freed. This causes\nthe use-after-free error to occur when the laundromat tries to free\nthe expired cpntf_state.\n\nThis patch adds a call to nfs4_free_cpntf_statelist in\nnfsd4_close_open_stateid to clean up the copy state before calling\nfree_ol_stateid_reaplist to free the lock state\u0027s stid on the reaplist."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:27:19.462Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bbacfcde5fff25ac22597e8373a065c647da6738"
        },
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          "url": "https://git.kernel.org/stable/c/83b94969751a691347606dbe6b1865efcfa5a643"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ea71246b7a02af675d733e72d14bd0d591d5f4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/35aa0fb8c3033a3d78603356e96fc18c5b9cceb2"
        },
        {
          "url": "https://git.kernel.org/stable/c/019805fea91599b22dfa62ffb29c022f35abeb06"
        }
      ],
      "title": "NFSD: fix use-after-free on source server when doing inter-server copy",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50241",
    "datePublished": "2025-09-15T14:01:47.539Z",
    "dateReserved": "2025-09-15T13:58:00.971Z",
    "dateUpdated": "2025-12-23T13:27:19.462Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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