Vulnerability-Lookup

GHSA-PH4X-4WH2-2QRM

Vulnerability from github – Published: 2026-10-09 09:31 – Updated: 2026-10-09 09:31

Details

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

bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL

An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter may reallocate skb->head, leaving the per-CPU SRH pointer dangling. Post-program SRH validation then writes through that pointer.

Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier rejects this unsafe helper combination. Other LWT program types continue to expose the helper through lwt_out_func_proto().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98383"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-09T08:16:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL\n\nAn LWT_SEG6LOCAL program can invalidate its cached SRH with\nbpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter\nmay reallocate skb-\u003ehead, leaving the per-CPU SRH pointer dangling.\nPost-program SRH validation then writes through that pointer.\n\nDisallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier\nrejects this unsafe helper combination. Other LWT program types continue\nto expose the helper through lwt_out_func_proto().",
  "id": "GHSA-ph4x-4wh2-2qrm",
  "modified": "2026-10-09T09:31:05Z",
  "published": "2026-10-09T09:31:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98383"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f38472a2aa8704a6b514c0dfa9c32f3672b8f32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37b18688cd18fd86d2f35c212df1611862a26cd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f9e57b5a3a033f95f49ef9d541340cdbcb80abb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9bb0e735460751b620156f800a4279a28573392"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cae8674489f26edf7553fdd660599466cbb4c32f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df0072be6fc373cb22f9ea854d458b04e32a03cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4a62833adff6ef0fe7c0b90393204fe3c26b5c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98383 (GCVE-0-2026-98383)

Vulnerability from cvelistv5 – Published: 2026-10-09 07:34 – Updated: 2026-10-09 07:34

Title

bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter may reallocate skb->head, leaving the per-CPU SRH pointer dangling. Post-program SRH validation then writes through that pointer. Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier rejects this unsafe helper combination. Other LWT program types continue to expose the helper through lwt_out_func_proto().

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/0f38472a2aa8704a6…
https://git.kernel.org/stable/c/cae8674489f26edf7…
https://git.kernel.org/stable/c/9f9e57b5a3a033f95…
https://git.kernel.org/stable/c/df0072be6fc373cb2…
https://git.kernel.org/stable/c/b9bb0e735460751b6…
https://git.kernel.org/stable/c/37b18688cd18fd86d…
https://git.kernel.org/stable/c/fca71ead7a20290af…
https://git.kernel.org/stable/c/e4a62833adff6ef0f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < 0f38472a2aa8704a6b514c0dfa9c32f3672b8f32 (git) Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < cae8674489f26edf7553fdd660599466cbb4c32f (git) Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < 9f9e57b5a3a033f95f49ef9d541340cdbcb80abb (git) Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < df0072be6fc373cb22f9ea854d458b04e32a03cf (git) Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < b9bb0e735460751b620156f800a4279a28573392 (git) Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < 37b18688cd18fd86d2f35c212df1611862a26cd5 (git) Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < fca71ead7a20290af1e2046983eeafae43d21af1 (git) Affected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 , < e4a62833adff6ef0fe7c0b90393204fe3c26b5c5 (git)
Linux	Linux	Affected: 4.18 Unaffected: 0 , < 4.18 (semver) Unaffected: 5.10.271 , ≤ 5.10.* (semver) Unaffected: 5.15.222 , ≤ 5.15.* (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (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-rc5 , ≤ * (original_commit_for_fix)

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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
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      ],
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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-PH4X-4WH2-2QRM

CVE-2026-98383 (GCVE-0-2026-98383)

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