CVE-2026-98031 (GCVE-0-2026-98031)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nexthop: Initialize extack in remove_nh_grp_entry() remove_nh_grp_entry() prints the extack message when a listener fails to replace the reduced nexthop group. However, extack is not initialized and listeners are not required to set a message when returning an error. Neither netdevsim nor mlxsw do so when an allocation fails, resulting in the dereference of an uninitialized stack pointer. Fix by zero-initializing extack, as was done in commit 6347c5314cee ("nexthop: initialize extack in nh_res_bucket_migrate()").
References
Impacted products
Vendor Product Version
Linux Linux Version: 833a1065eeb14437a9a0dfa9dad06ea09894e0b5
Version: 833a1065eeb14437a9a0dfa9dad06ea09894e0b5
Version: 833a1065eeb14437a9a0dfa9dad06ea09894e0b5
Version: 833a1065eeb14437a9a0dfa9dad06ea09894e0b5
Version: 833a1065eeb14437a9a0dfa9dad06ea09894e0b5
Version: 833a1065eeb14437a9a0dfa9dad06ea09894e0b5
Version: 833a1065eeb14437a9a0dfa9dad06ea09894e0b5
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/nexthop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "35d9ec61466109ef0c2de87067338d929f629527",
              "status": "affected",
              "version": "833a1065eeb14437a9a0dfa9dad06ea09894e0b5",
              "versionType": "git"
            },
            {
              "lessThan": "704319510af2179cf03955747d714ab291075c25",
              "status": "affected",
              "version": "833a1065eeb14437a9a0dfa9dad06ea09894e0b5",
              "versionType": "git"
            },
            {
              "lessThan": "17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a",
              "status": "affected",
              "version": "833a1065eeb14437a9a0dfa9dad06ea09894e0b5",
              "versionType": "git"
            },
            {
              "lessThan": "030c878eaedf0449e2b5401a0a0146d0afcc645e",
              "status": "affected",
              "version": "833a1065eeb14437a9a0dfa9dad06ea09894e0b5",
              "versionType": "git"
            },
            {
              "lessThan": "d643cea4248668dc493c513aa7cbc6505eb1a4a9",
              "status": "affected",
              "version": "833a1065eeb14437a9a0dfa9dad06ea09894e0b5",
              "versionType": "git"
            },
            {
              "lessThan": "d80677ad7aa5bebfccfd58caa4852b65abe70561",
              "status": "affected",
              "version": "833a1065eeb14437a9a0dfa9dad06ea09894e0b5",
              "versionType": "git"
            },
            {
              "lessThan": "5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b",
              "status": "affected",
              "version": "833a1065eeb14437a9a0dfa9dad06ea09894e0b5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/nexthop.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: Initialize extack in remove_nh_grp_entry()\n\nremove_nh_grp_entry() prints the extack message when a listener fails\nto replace the reduced nexthop group. However, extack is not\ninitialized and listeners are not required to set a message when\nreturning an error. Neither netdevsim nor mlxsw do so when an\nallocation fails, resulting in the dereference of an uninitialized\nstack pointer.\n\nFix by zero-initializing extack, as was done in commit 6347c5314cee\n(\"nexthop: initialize extack in nh_res_bucket_migrate()\")."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:36.306Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/35d9ec61466109ef0c2de87067338d929f629527"
        },
        {
          "url": "https://git.kernel.org/stable/c/704319510af2179cf03955747d714ab291075c25"
        },
        {
          "url": "https://git.kernel.org/stable/c/17acbcd4c5a6ca3dd3f9e52eb203c9175bde609a"
        },
        {
          "url": "https://git.kernel.org/stable/c/030c878eaedf0449e2b5401a0a0146d0afcc645e"
        },
        {
          "url": "https://git.kernel.org/stable/c/d643cea4248668dc493c513aa7cbc6505eb1a4a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/d80677ad7aa5bebfccfd58caa4852b65abe70561"
        },
        {
          "url": "https://git.kernel.org/stable/c/5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b"
        }
      ],
      "title": "nexthop: Initialize extack in remove_nh_grp_entry()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98031",
    "datePublished": "2026-09-25T10:23:47.562Z",
    "dateReserved": "2026-09-25T10:19:56.070Z",
    "dateUpdated": "2026-10-19T09:12:36.306Z",
    "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.