CVE-2026-43339 (GCVE-0-2026-43339)
Vulnerability from cvelistv5
Published
2026-05-08 13:31
Modified
2026-08-05 12:27
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
Version: f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "eec49a33611f20336b357b3953df44f1a02049e8",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            },
            {
              "lessThan": "bacc7f31085c9820922f00bc7d79756ffa13123a",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            },
            {
              "lessThan": "7bfafa1b0cd582983ebec6bb20f0a435528fe567",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            },
            {
              "lessThan": "7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            },
            {
              "lessThan": "25357b670afb5b517096da783abaa5cc4bf8359e",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            },
            {
              "lessThan": "3cd4efb5df72843dfac892d0b3c7a4a8bd926b65",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            },
            {
              "lessThan": "2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            },
            {
              "lessThan": "fd63f185979b047fb22a0dfc6bd94d0cab6a6a70",
              "status": "affected",
              "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/addrconf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "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",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "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": "5.10.253",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.81",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.12",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through local network administration actions such as rtnetlink/sysctl-driven IPv6 address configuration and interface down/up transitions, not by remote packets.\nAC:L - A local attacker who can administer a network namespace can create the retained permanent-address state and repeatedly drive link-up restoration while inducing allocation pressure; there is no victim-controlled race required.\nPR:L - The operations require CAP_NET_ADMIN, but they are checked in the target network namespace and are reachable to an unprivileged local user via user+network namespaces on systems where those are enabled.\nUI:N - No victim user action is needed once the attacker can issue the local namespace/network configuration operations.\nS:U - The impact is within the kernel security authority; this is standard local kernel memory-safety impact rather than a cross-scope boundary such as guest-to-host escape.\nC:H - The bug dereferences a freed inet6_ifaddr and can read freed or reallocated kernel heap contents in the warning path; per the requested UAF guidance, confidentiality is High.\nI:H - Although the immediate dereference is in logging, it is a kernel heap use-after-free and the requested kernel guidance treats UAFs as potentially exploitable through heap reuse/spraying for high integrity impact.\nA:H - The freed object access can trigger a kernel fault, UAF detector report, or crash, and the local trigger can be repeated."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:27:20.671Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eec49a33611f20336b357b3953df44f1a02049e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/bacc7f31085c9820922f00bc7d79756ffa13123a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7bfafa1b0cd582983ebec6bb20f0a435528fe567"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e"
        },
        {
          "url": "https://git.kernel.org/stable/c/25357b670afb5b517096da783abaa5cc4bf8359e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cd4efb5df72843dfac892d0b3c7a4a8bd926b65"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd63f185979b047fb22a0dfc6bd94d0cab6a6a70"
        }
      ],
      "title": "ipv6: prevent possible UaF in addrconf_permanent_addr()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43339",
    "datePublished": "2026-05-08T13:31:24.315Z",
    "dateReserved": "2026-05-01T14:12:56.003Z",
    "dateUpdated": "2026-08-05T12:27:20.671Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.