CVE-2026-43239 (GCVE-0-2026-43239)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-08-05 12:26
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: prevent races in ->query_interfaces() It was possible for two query interface works to be concurrently trying to update the interfaces. Prevent this by checking and updating iface_last_update under iface_lock.
References
Impacted products
Vendor Product Version
Linux Linux Version: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec
Version: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec
Version: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec
Version: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec
Version: aa45dadd34e44fcd6a9df4b395bee5b5633b4cec
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
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            }
          ]
        },
        {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "5.19",
                  "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\nsmb: client: prevent races in -\u003equery_interfaces()\n\nIt was possible for two query interface works to be concurrently trying\nto update the interfaces.\n\nPrevent this by checking and updating iface_last_update under\niface_lock."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable SMB client code processes FSCTL_QUERY_NETWORK_INTERFACE_INFO responses supplied by a remote SMB server over the network.\nAC:L - The required SMB3/multichannel capability and response timing can be controlled by a malicious server, and concurrent interface queries can be induced through normal mounted-session refresh/reconnect behavior.\nPR:N - The attacker needs no privileges on the victim system; a malicious or compromised SMB server can supply the responses once the client connects.\nUI:R - Exploitation requires the victim system or user to mount/connect to the SMB share, which is user interaction under the provided guidance.\nS:U - The impact is within the client kernel that contains the vulnerable SMB client component, without crossing a separate security authority such as a VM boundary.\nC:H - The race can corrupt the kernel-maintained cifs_server_iface linked list/refcount state, and kernel heap/list corruption is defensibly treated as potentially exposing arbitrary kernel memory.\nI:H - The same kernel list corruption can plausibly be leveraged beyond a simple fault into kernel memory corruption or code execution, so integrity impact is high under the required higher-severity rule.\nA:H - Even without full exploitation, the race can corrupt interface-list state and trigger kernel oops/panic or hang in the SMB client path."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:49.440Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489"
        }
      ],
      "title": "smb: client: prevent races in -\u003equery_interfaces()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43239",
    "datePublished": "2026-05-06T11:28:33.623Z",
    "dateReserved": "2026-05-01T14:12:55.995Z",
    "dateUpdated": "2026-08-05T12:26:49.440Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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