Vulnerability-Lookup

GHSA-MFPH-JXQ2-HG99

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

net: fib_rules: Don't dump dying fib_rule in fib_rules_dump().

rocker_router_fib_event() calls fib_rule_get() during RCU dump.

If the fib_rule is dying, refcount_inc() will complain about it.

Let's call refcount_inc_not_zero() in fib_rules_dump().

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74288"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:28Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fib_rules: Don\u0027t dump dying fib_rule in fib_rules_dump().\n\nrocker_router_fib_event() calls fib_rule_get() during RCU dump.\n\nIf the fib_rule is dying, refcount_inc() will complain about it.\n\nLet\u0027s call refcount_inc_not_zero() in fib_rules_dump().",
  "id": "GHSA-mfph-jxq2-hg99",
  "modified": "2026-08-17T06:33:36Z",
  "published": "2026-08-15T06:32:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74288"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f929b59f4cd0e05bb1ecefe12b77e85911d4be2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fbc6c6efe78f4454a51afa0587efb6826f60f00"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2821e85c058f81c9948a2fb1a634f7b47457d51c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2dfdc210d240bd48bb2ea746430b02b5571b6db9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3af0bc1bd9039e2e50abf3e2d7fee411f38bce4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b7ae30c81c2ee10a644749a3704a5c797ccc308"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7ef30753353ba6a95d693b1863a0214222a199a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb4a5b3c91af3c8d705bb2e9f6f8069a70db26fc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74288 (GCVE-0-2026-74288)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:45

Title

net: fib_rules: Don't dump dying fib_rule in fib_rules_dump().

Summary

In the Linux kernel, the following vulnerability has been resolved: net: fib_rules: Don't dump dying fib_rule in fib_rules_dump(). rocker_router_fib_event() calls fib_rule_get() during RCU dump. If the fib_rule is dying, refcount_inc() will complain about it. Let's call refcount_inc_not_zero() in fib_rules_dump().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/0f929b59f4cd0e05b…
https://git.kernel.org/stable/c/4b7ae30c81c2ee10a…
https://git.kernel.org/stable/c/2dfdc210d240bd48b…
https://git.kernel.org/stable/c/a7ef30753353ba6a9…
https://git.kernel.org/stable/c/1fbc6c6efe78f4454…
https://git.kernel.org/stable/c/bb4a5b3c91af3c8d7…
https://git.kernel.org/stable/c/3af0bc1bd9039e2e5…
https://git.kernel.org/stable/c/2821e85c058f81c99…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < 0f929b59f4cd0e05bb1ecefe12b77e85911d4be2 (git) Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < 4b7ae30c81c2ee10a644749a3704a5c797ccc308 (git) Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < 2dfdc210d240bd48bb2ea746430b02b5571b6db9 (git) Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < a7ef30753353ba6a95d693b1863a0214222a199a (git) Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < 1fbc6c6efe78f4454a51afa0587efb6826f60f00 (git) Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < bb4a5b3c91af3c8d705bb2e9f6f8069a70db26fc (git) Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < 3af0bc1bd9039e2e50abf3e2d7fee411f38bce4e (git) Affected: 5d7bfd141924a5ece21eb612ad3c56612f041c1e , < 2821e85c058f81c9948a2fb1a634f7b47457d51c (git)
Linux	Linux	Affected: 4.12 Unaffected: 0 , < 4.12 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/fib_rules.h",
            "net/core/fib_rules.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0f929b59f4cd0e05bb1ecefe12b77e85911d4be2",
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              "version": "5d7bfd141924a5ece21eb612ad3c56612f041c1e",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "5d7bfd141924a5ece21eb612ad3c56612f041c1e",
              "versionType": "git"
            },
            {
              "lessThan": "2dfdc210d240bd48bb2ea746430b02b5571b6db9",
              "status": "affected",
              "version": "5d7bfd141924a5ece21eb612ad3c56612f041c1e",
              "versionType": "git"
            },
            {
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "5d7bfd141924a5ece21eb612ad3c56612f041c1e",
              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
              "version": "4.12"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fib_rules: Don\u0027t dump dying fib_rule in fib_rules_dump().\n\nrocker_router_fib_event() calls fib_rule_get() during RCU dump.\n\nIf the fib_rule is dying, refcount_inc() will complain about it.\n\nLet\u0027s call refcount_inc_not_zero() in fib_rules_dump()."
        }
      ],
      "metrics": [
        {
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            "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 bug is reached only through local kernel networking control paths: fib_rules_dump() runs during register_fib_notifier() and races with RTM_DELRULE netlink handling in fib_delrule(), not via remotely received packets or a network-facing protocol handler.\nAC:L - Exploitation is a race where the attacker concurrently deletes FIB rules (repeated RTM_DELRULE or netns teardown) while fib_rules_dump() replays RULE_ADD events; the attacker controls both sides and can retry, as demonstrated by syzbot during netdevsim reload/cleanup_net.\nPR:L - Triggering concurrent FIB rule deletion requires CAP_NET_ADMIN on the target network namespace, which unprivileged users can obtain inside user/network namespaces (e.g., unshare -Urn), while driver registration commonly occurs in the same namespace during netdevsim/devlink setup.\nUI:N - No end-user or administrator UI action is required beyond programmatic netlink/devlink operations that an attacker can script; exploitation does not depend on a victim opening files, clicking links, or mounting filesystems.\nS:U - Impact is a kernel heap use-after-free in fib_rule handling leading to memory corruption within the host kernel; it does not inherently cross a VM/hypervisor or IOMMU security boundary without separate exploitation of unrelated boundaries.\nC:H - A dying fib_rule can be passed to FIB notifiers after its refcount hits zero; handlers such as rocker_router_fib_event() call fib_rule_get() and later dereference rule fields in workqueues, enabling reads of freed slab memory and potential kernel pointer disclosure.\nI:H - The UAF hands attackers control over the lifetime and contents of freed fib_rule objects; with heap grooming this class of corruption is reasonably leveraged into arbitrary kernel writes or control-flow hijack, not merely a benign warning.\nA:H - refcount_inc() on a zero refcount emits use-after-free warnings and concurrent dereference of freed fib_rule structures during dump/replay can cause kernel oops/panics, especially under automated stress seen in syzbot reproductions."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:27.821Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f929b59f4cd0e05bb1ecefe12b77e85911d4be2"
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          "url": "https://git.kernel.org/stable/c/4b7ae30c81c2ee10a644749a3704a5c797ccc308"
        },
        {
          "url": "https://git.kernel.org/stable/c/2dfdc210d240bd48bb2ea746430b02b5571b6db9"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7ef30753353ba6a95d693b1863a0214222a199a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fbc6c6efe78f4454a51afa0587efb6826f60f00"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/3af0bc1bd9039e2e50abf3e2d7fee411f38bce4e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2821e85c058f81c9948a2fb1a634f7b47457d51c"
        }
      ],
      "title": "net: fib_rules: Don\u0027t dump dying fib_rule in fib_rules_dump().",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74288",
    "datePublished": "2026-08-15T05:57:55.760Z",
    "dateReserved": "2026-08-15T05:44:03.881Z",
    "dateUpdated": "2026-08-17T05:45:27.821Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-MFPH-JXQ2-HG99

CVE-2026-74288 (GCVE-0-2026-74288)

Tags

Sightings

Nomenclature