CVE-2022-49418 (GCVE-0-2022-49418)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:12 – Updated: 2026-05-11 18:59
VLAI
Title
NFSv4: Fix free of uninitialized nfs4_label on referral lookup.
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSv4: Fix free of uninitialized nfs4_label on referral lookup. Send along the already-allocated fattr along with nfs4_fs_locations, and drop the memcpy of fattr. We end up growing two more allocations, but this fixes up a crash as: PID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: "ls" #0 [ffffc90000857920] panic at ffffffff81b9bfde #1 [ffffc900008579c0] do_trap at ffffffff81023a9b #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78 #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45 #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs] #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f #7 [ffffc90000857c60] walk_component at ffffffff813a86c4 #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553 #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9558a007dbc383d48e7f5a123d0b5ff656c71068 , < 6015292653d95ba9f72906e2b65e536aa5807d64 (git)
Affected: 9558a007dbc383d48e7f5a123d0b5ff656c71068 , < c3ed222745d9ad7b69299b349a64ba533c64a34f (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 5.18.3 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/nfs4namespace.c",
            "fs/nfs/nfs4proc.c",
            "fs/nfs/nfs4state.c",
            "fs/nfs/nfs4xdr.c",
            "include/linux/nfs_xdr.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6015292653d95ba9f72906e2b65e536aa5807d64",
              "status": "affected",
              "version": "9558a007dbc383d48e7f5a123d0b5ff656c71068",
              "versionType": "git"
            },
            {
              "lessThan": "c3ed222745d9ad7b69299b349a64ba533c64a34f",
              "status": "affected",
              "version": "9558a007dbc383d48e7f5a123d0b5ff656c71068",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/nfs4namespace.c",
            "fs/nfs/nfs4proc.c",
            "fs/nfs/nfs4state.c",
            "fs/nfs/nfs4xdr.c",
            "include/linux/nfs_xdr.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.3",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: Fix free of uninitialized nfs4_label on referral lookup.\n\nSend along the already-allocated fattr along with nfs4_fs_locations, and\ndrop the memcpy of fattr.  We end up growing two more allocations, but this\nfixes up a crash as:\n\nPID: 790    TASK: ffff88811b43c000  CPU: 0   COMMAND: \"ls\"\n #0 [ffffc90000857920] panic at ffffffff81b9bfde\n #1 [ffffc900008579c0] do_trap at ffffffff81023a9b\n #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78\n #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45\n #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de\n #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs]\n #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f\n #7 [ffffc90000857c60] walk_component at ffffffff813a86c4\n #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553\n #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T18:59:25.982Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6015292653d95ba9f72906e2b65e536aa5807d64"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3ed222745d9ad7b69299b349a64ba533c64a34f"
        }
      ],
      "title": "NFSv4: Fix free of uninitialized nfs4_label on referral lookup.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49418",
    "datePublished": "2025-02-26T02:12:43.359Z",
    "dateReserved": "2025-02-26T02:08:31.568Z",
    "dateUpdated": "2026-05-11T18:59:25.982Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-49418",
      "date": "2026-06-26",
      "epss": "0.0021",
      "percentile": "0.11153"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49418\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:18.260\",\"lastModified\":\"2025-09-22T20:01:56.010\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nNFSv4: Fix free of uninitialized nfs4_label on referral lookup.\\n\\nSend along the already-allocated fattr along with nfs4_fs_locations, and\\ndrop the memcpy of fattr.  We end up growing two more allocations, but this\\nfixes up a crash as:\\n\\nPID: 790    TASK: ffff88811b43c000  CPU: 0   COMMAND: \\\"ls\\\"\\n #0 [ffffc90000857920] panic at ffffffff81b9bfde\\n #1 [ffffc900008579c0] do_trap at ffffffff81023a9b\\n #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78\\n #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45\\n #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de\\n #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs]\\n #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f\\n #7 [ffffc90000857c60] walk_component at ffffffff813a86c4\\n #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553\\n #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFSv4: Se corrige el error nfs4_label no inicializado en la b\u00fasqueda de referencias. Se env\u00eda el fattr ya asignado junto con nfs4_fs_locations y se elimina el memcpy de fattr. Terminamos aumentando dos asignaciones m\u00e1s, pero esto soluciona un fallo como: PID: 790 TAREA: ffff88811b43c000 CPU: 0 COMANDO: \\\"ls\\\" #0 [ffffc90000857920] panic en ffffffff81b9bfde #1 [ffffc900008579c0] do_trap en ffffffff81023a9b #2 [ffffc90000857a10] do_error_trap en ffffffff81023b78 #3 [ffffc90000857a58] exc_stack_segment en ffffffff81be1f45 #4 [ffffc90000857a80] asm_exc_stack_segment en ffffffff81c009de #5 [ffffc90000857b08] nfs_lookup en ffffffffa0302322 [nfs] #6 [ffffc90000857b70] __lookup_slow en ffffffff813a4a5f #7 [ffffc90000857c60] walk_component en ffffffff813a86c4 #8 [ffffc90000857cb8] path_lookupat en ffffffff813a9553 #9 [ffffc90000857cf0] filename_lookup en ffffffff813ab86b\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.18.3\",\"matchCriteriaId\":\"98CD047E-3CA9-4A90-93B0-040784FAD016\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6015292653d95ba9f72906e2b65e536aa5807d64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c3ed222745d9ad7b69299b349a64ba533c64a34f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.