Vulnerability-Lookup

GHSA-3J3Q-MXMX-XWQ4

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-18 18:31

Details

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

bpf: Check params size before reading reserved fields

bpf_crypto_ctx_create() is a kfunc whose second argument is declared with the __sz annotation, so the verifier only guarantees that params__sz bytes of params are valid. The function nevertheless reads params->reserved[0] and params->reserved[1] (offsets 14 and 15) before comparing params__sz against the size of struct bpf_crypto_params, so a BPF program can pass a shorter buffer and have the kernel read past the region that was validated for it.

Move the size check in front of the reserved field reads.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98611"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:13Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check params size before reading reserved fields\n\nbpf_crypto_ctx_create() is a kfunc whose second argument is declared\nwith the __sz annotation, so the verifier only guarantees that\nparams__sz bytes of params are valid.  The function nevertheless reads\nparams-\u003ereserved[0] and params-\u003ereserved[1] (offsets 14 and 15) before\ncomparing params__sz against the size of struct bpf_crypto_params, so a\nBPF program can pass a shorter buffer and have the kernel read past the\nregion that was validated for it.\n\nMove the size check in front of the reserved field reads.",
  "id": "GHSA-3j3q-mxmx-xwq4",
  "modified": "2026-10-18T18:31:56Z",
  "published": "2026-10-18T18:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98611"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86a0e945fb645ea90233fde239cd2de79f01974c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a11212910cf09b2fe8db9afa41ef60c4f81879c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd12d3e08620257fbcaa262785d7f4b9473afc7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98611 (GCVE-0-2026-98611)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22

Title

bpf: Check params size before reading reserved fields

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Check params size before reading reserved fields bpf_crypto_ctx_create() is a kfunc whose second argument is declared with the __sz annotation, so the verifier only guarantees that params__sz bytes of params are valid. The function nevertheless reads params->reserved[0] and params->reserved[1] (offsets 14 and 15) before comparing params__sz against the size of struct bpf_crypto_params, so a BPF program can pass a shorter buffer and have the kernel read past the region that was validated for it. Move the size check in front of the reserved field reads.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6820 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/e03253f5d65ebcd2a…
https://git.kernel.org/stable/c/cd12d3e08620257fb…
https://git.kernel.org/stable/c/86a0e945fb645ea90…
https://git.kernel.org/stable/c/a11212910cf09b2fe…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a (git) Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < cd12d3e08620257fbcaa262785d7f4b9473afc7a (git) Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < 86a0e945fb645ea90233fde239cd2de79f01974c (git) Affected: 3e1c6f35409f9e447bf37f64840f5b65576bfb78 , < a11212910cf09b2fe8db9afa41ef60c4f81879c5 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.55 , ≤ 6.18.* (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/crypto.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a",
              "status": "affected",
              "version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78",
              "versionType": "git"
            },
            {
              "lessThan": "cd12d3e08620257fbcaa262785d7f4b9473afc7a",
              "status": "affected",
              "version": "3e1c6f35409f9e447bf37f64840f5b65576bfb78",
              "versionType": "git"
            },
            {
              "lessThan": "86a0e945fb645ea90233fde239cd2de79f01974c",
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        },
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          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Check params size before reading reserved fields\n\nbpf_crypto_ctx_create() is a kfunc whose second argument is declared\nwith the __sz annotation, so the verifier only guarantees that\nparams__sz bytes of params are valid.  The function nevertheless reads\nparams-\u003ereserved[0] and params-\u003ereserved[1] (offsets 14 and 15) before\ncomparing params__sz against the size of struct bpf_crypto_params, so a\nBPF program can pass a shorter buffer and have the kernel read past the\nregion that was validated for it.\n\nMove the size check in front of the reserved field reads."
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    "cveId": "CVE-2026-98611",
    "datePublished": "2026-10-18T15:19:26.922Z",
    "dateReserved": "2026-09-25T10:25:14.360Z",
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    "state": "PUBLISHED"
  },
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}

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.

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