Vulnerability-Lookup

GHSA-J5JH-54QW-942F

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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

net: ravb: avoid dereferencing an invalid PTP clock

The PTP clock is unavailable before the first open, so querying its index can dereference a NULL pointer. Registration failures can also leave an error pointer in priv->ptp.clock.

Cache the PHC index separately and report -1 while no clock is registered. Normalize registration errors to NULL and preserve the static timestamping capabilities.

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-2026-80992"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:06Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ravb: avoid dereferencing an invalid PTP clock\n\nThe PTP clock is unavailable before the first open, so querying its\nindex can dereference a NULL pointer. Registration failures can also\nleave an error pointer in priv-\u003eptp.clock.\n\nCache the PHC index separately and report -1 while no clock is\nregistered. Normalize registration errors to NULL and preserve the\nstatic timestamping capabilities.",
  "id": "GHSA-j5jh-54qw-942f",
  "modified": "2026-09-14T15:32:22Z",
  "published": "2026-09-11T21:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80992"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0aaa53936419cf0c19c670387fc6d431e042a1b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f77af0aaf277413ff32f6ff8c2c4282bd64c897"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29ffd972531f8e6e0edf4ea3496190acff9fc9c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d4d06d6e2b501cb8e30ed3b1924c470358e8052"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf3308416a2be85dcc9965b614a745b40beeff14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fc710f89a644e030a7ca15343176ca862fd61b9d"
    }
  ],
  "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-2026-80992 (GCVE-0-2026-80992)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59

Title

net: ravb: avoid dereferencing an invalid PTP clock

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ravb: avoid dereferencing an invalid PTP clock The PTP clock is unavailable before the first open, so querying its index can dereference a NULL pointer. Registration failures can also leave an error pointer in priv->ptp.clock. Cache the PHC index separately and report -1 while no clock is registered. Normalize registration errors to NULL and preserve the static timestamping capabilities.

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

6 references

URL	Tags
https://git.kernel.org/stable/c/29ffd972531f8e6e0…
https://git.kernel.org/stable/c/bf3308416a2be85dc…
https://git.kernel.org/stable/c/fc710f89a644e030a…
https://git.kernel.org/stable/c/8d4d06d6e2b501cb8…
https://git.kernel.org/stable/c/0aaa53936419cf0c1…
https://git.kernel.org/stable/c/1f77af0aaf277413f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 29ffd972531f8e6e0edf4ea3496190acff9fc9c2 (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < bf3308416a2be85dcc9965b614a745b40beeff14 (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < fc710f89a644e030a7ca15343176ca862fd61b9d (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 8d4d06d6e2b501cb8e30ed3b1924c470358e8052 (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 0aaa53936419cf0c19c670387fc6d431e042a1b6 (git) Affected: a0d2f20650e81407d8e51ad2cbdc492861c74e9c , < 1f77af0aaf277413ff32f6ff8c2c4282bd64c897 (git)
Linux	Linux	Affected: 4.2 Unaffected: 0 , < 4.2 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/renesas/ravb.h",
            "drivers/net/ethernet/renesas/ravb_main.c",
            "drivers/net/ethernet/renesas/ravb_ptp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c",
              "versionType": "git"
            },
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              "lessThan": "bf3308416a2be85dcc9965b614a745b40beeff14",
              "status": "affected",
              "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c",
              "versionType": "git"
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              "status": "affected",
              "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c",
              "versionType": "git"
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            {
              "lessThan": "8d4d06d6e2b501cb8e30ed3b1924c470358e8052",
              "status": "affected",
              "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c",
              "versionType": "git"
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            {
              "lessThan": "0aaa53936419cf0c19c670387fc6d431e042a1b6",
              "status": "affected",
              "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c",
              "versionType": "git"
            },
            {
              "lessThan": "1f77af0aaf277413ff32f6ff8c2c4282bd64c897",
              "status": "affected",
              "version": "a0d2f20650e81407d8e51ad2cbdc492861c74e9c",
              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/renesas/ravb.h",
            "drivers/net/ethernet/renesas/ravb_main.c",
            "drivers/net/ethernet/renesas/ravb_ptp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            },
            {
              "lessThan": "4.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                {
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            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ravb: avoid dereferencing an invalid PTP clock\n\nThe PTP clock is unavailable before the first open, so querying its\nindex can dereference a NULL pointer. Registration failures can also\nleave an error pointer in priv-\u003eptp.clock.\n\nCache the PHC index separately and report -1 while no clock is\nregistered. Normalize registration errors to NULL and preserve the\nstatic timestamping capabilities."
        }
      ],
      "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 - ravb_get_ts_info() is reached only via local SIOCETHTOOL ETHTOOL_GET_TS_INFO, ethtool netlink TSINFO_GET, SO_TIMESTAMPING BIND_PHC, or taprio setup on the ravb netdev. Received Ethernet/PTP packets never enter this path.\nAC:L - ethtool timestamp-info on a never-opened ravb interface deterministically calls ptp_clock_index(NULL), and after a normal open/close ravb_ptp_stop() leaves a dangling priv-\u003eptp.clock that the same query dereferences. The attacker does not need a race or a rare config.\nPR:L - ETHTOOL_GET_TS_INFO is on the ethtool ioctl allow-list that skips CAP_NET_ADMIN, and ETHTOOL_MSG_TSINFO_GET has no GENL admin flag, so an unprivileged local user can trigger it. Interface cycling is privileged, but the down/never-opened state exists after normal system management.\nUI:N - The attacker issues the ethtool ioctl/netlink query (or SO_TIMESTAMPING BIND_PHC) directly against the existing ravb netdev. No separate victim action is required.\nS:U - The defect is in the ravb kernel Ethernet/PTP driver and impacts the same kernel. It is not a guest-to-host, IOMMU, or other cross-authority boundary bypass.\nC:H - After ndo_stop, ravb_ptp_stop() unregisters and kfree\u0027s struct ptp_clock via ptp_clock_release() but leaves priv-\u003eptp.clock set, so a later ptp_clock_index() is a kernel heap UAF read. Kernel scoring treats UAFs as high confidentiality because freed-object reuse can yield disclosure primitives.\nI:H - The get_ts_info hit is a stale read of ptp_clock.index, but after close the object is a freed heap ptp_clock. Kernel scoring treats that UAF as high integrity impact because heap reuse can be leveraged toward write or control-flow primitives.\nA:H - Before first open, ptp_clock_index(NULL) oopses; a failed ptp_clock_register() leaves an ERR_PTR that is also dereferenced; and the post-close dangling pointer is a UAF that can panic. Any of these kernel crashes is high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:59:33.146Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/bf3308416a2be85dcc9965b614a745b40beeff14"
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        {
          "url": "https://git.kernel.org/stable/c/8d4d06d6e2b501cb8e30ed3b1924c470358e8052"
        },
        {
          "url": "https://git.kernel.org/stable/c/0aaa53936419cf0c19c670387fc6d431e042a1b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f77af0aaf277413ff32f6ff8c2c4282bd64c897"
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      ],
      "title": "net: ravb: avoid dereferencing an invalid PTP clock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80992",
    "datePublished": "2026-09-11T19:42:48.855Z",
    "dateReserved": "2026-08-26T14:34:25.811Z",
    "dateUpdated": "2026-09-14T11:59:33.146Z",
    "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.
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