CVE-2026-43339 (GCVE-0-2026-43339)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-05-08 13:31
VLAI?
Title
ipv6: prevent possible UaF in addrconf_permanent_addr()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent possible UaF in addrconf_permanent_addr() The mentioned helper try to warn the user about an exceptional condition, but the message is delivered too late, accessing the ipv6 after its possible deletion. Reorder the statement to avoid the possible UaF; while at it, place the warning outside the idev->lock as it needs no protection.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < eec49a33611f20336b357b3953df44f1a02049e8 (git)
Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < bacc7f31085c9820922f00bc7d79756ffa13123a (git)
Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < 7bfafa1b0cd582983ebec6bb20f0a435528fe567 (git)
Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < 7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e (git)
Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < 25357b670afb5b517096da783abaa5cc4bf8359e (git)
Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < 3cd4efb5df72843dfac892d0b3c7a4a8bd926b65 (git)
Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < 2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1 (git)
Affected: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac , < fd63f185979b047fb22a0dfc6bd94d0cab6a6a70 (git)
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    Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "4.6"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
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            },
            {
              "lessThanOrEqual": "6.6.*",
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              "version": "6.6.134",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
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            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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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\nipv6: prevent possible UaF in addrconf_permanent_addr()\n\nThe mentioned helper try to warn the user about an exceptional\ncondition, but the message is delivered too late, accessing the ipv6\nafter its possible deletion.\n\nReorder the statement to avoid the possible UaF; while at it, place the\nwarning outside the idev-\u003elock as it needs no protection."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T13:31:24.315Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/eec49a33611f20336b357b3953df44f1a02049e8"
        },
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          "url": "https://git.kernel.org/stable/c/fd63f185979b047fb22a0dfc6bd94d0cab6a6a70"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43339",
    "datePublished": "2026-05-08T13:31:24.315Z",
    "dateReserved": "2026-05-01T14:12:56.003Z",
    "dateUpdated": "2026-05-08T13:31:24.315Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43339",
      "date": "2026-05-09",
      "epss": "0.00024",
      "percentile": "0.07036"
    },
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  }
}


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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

Author Source Type Date Other

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.