ghsa-5q55-gh5r-h286
Vulnerability from github
Published
2024-10-21 21:30
Modified
2024-10-24 21:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

nfsd: fix possible badness in FREE_STATEID

When multiple FREE_STATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-free or counter refcount underflow errors.

In nfsd4_free_stateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4_put_stid(), that allows another FREE_STATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zeroed counter.

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{
   affected: [],
   aliases: [
      "CVE-2024-50043",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-416",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-10-21T20:15:17Z",
      severity: "HIGH",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix possible badness in FREE_STATEID\n\nWhen multiple FREE_STATEIDs are sent for the same delegation stateid,\nit can lead to a possible either use-after-free or counter refcount\nunderflow errors.\n\nIn nfsd4_free_stateid() under the client lock we find a delegation\nstateid, however the code drops the lock before calling nfs4_put_stid(),\nthat allows another FREE_STATE to find the stateid again. The first one\nwill proceed to then free the stateid which leads to either\nuse-after-free or decrementing already zeroed counter.",
   id: "GHSA-5q55-gh5r-h286",
   modified: "2024-10-24T21:31:03Z",
   published: "2024-10-21T21:30:53Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-50043",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/7ca9e472ce5c67daa3188a348ece8c02a0765039",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/c88c150a467fcb670a1608e2272beeee3e86df6e",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
         type: "CVSS_V3",
      },
   ],
}


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