Vulnerability-Lookup

GHSA-J4XV-H5FV-6V4M

Vulnerability from github – Published: 2024-10-21 18:30 – Updated: 2026-03-25 12:30

Details

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

net: gso: fix tcp fraglist segmentation after pull from frag_list

Detect tcp gso fraglist skbs with corrupted geometry (see below) and pass these to skb_segment instead of skb_segment_list, as the first can segment them correctly.

Valid SKB_GSO_FRAGLIST skbs - consist of two or more segments - the head_skb holds the protocol headers plus first gso_size - one or more frag_list skbs hold exactly one segment - all but the last must be gso_size

Optional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can modify these skbs, breaking these invariants.

In extreme cases they pull all data into skb linear. For TCP, this causes a NULL ptr deref in __tcpv4_gso_segment_list_csum at tcp_hdr(seg->next).

Detect invalid geometry due to pull, by checking head_skb size. Don't just drop, as this may blackhole a destination. Convert to be able to pass to regular skb_segment.

Approach and description based on a patch by Willem de Bruijn.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-49979"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T18:15:18Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gso: fix tcp fraglist segmentation after pull from frag_list\n\nDetect tcp gso fraglist skbs with corrupted geometry (see below) and\npass these to skb_segment instead of skb_segment_list, as the first\ncan segment them correctly.\n\nValid SKB_GSO_FRAGLIST skbs\n- consist of two or more segments\n- the head_skb holds the protocol headers plus first gso_size\n- one or more frag_list skbs hold exactly one segment\n- all but the last must be gso_size\n\nOptional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can\nmodify these skbs, breaking these invariants.\n\nIn extreme cases they pull all data into skb linear. For TCP, this\ncauses a NULL ptr deref in __tcpv4_gso_segment_list_csum at\ntcp_hdr(seg-\u003enext).\n\nDetect invalid geometry due to pull, by checking head_skb size.\nDon\u0027t just drop, as this may blackhole a destination. Convert to be\nable to pass to regular skb_segment.\n\nApproach and description based on a patch by Willem de Bruijn.",
  "id": "GHSA-j4xv-h5fv-6v4m",
  "modified": "2026-03-25T12:30:17Z",
  "published": "2024-10-21T18:30:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49979"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17bd3bd82f9f79f3feba15476c2b2c95a9b11ff8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d4a83a44428de45bfe9dccb0192a3711d1097e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fdd8c83e83fa5e82f1b5585245c51e0355c9f46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75733986fcb0725c0033cde94764389e287b331e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e19201b0c67da5146eaac06fd3d44bd7945c3448"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-49979 (GCVE-0-2024-49979)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:02 – Updated: 2026-08-05 11:40

Title

net: gso: fix tcp fraglist segmentation after pull from frag_list

Summary

In the Linux kernel, the following vulnerability has been resolved: net: gso: fix tcp fraglist segmentation after pull from frag_list Detect tcp gso fraglist skbs with corrupted geometry (see below) and pass these to skb_segment instead of skb_segment_list, as the first can segment them correctly. Valid SKB_GSO_FRAGLIST skbs - consist of two or more segments - the head_skb holds the protocol headers plus first gso_size - one or more frag_list skbs hold exactly one segment - all but the last must be gso_size Optional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can modify these skbs, breaking these invariants. In extreme cases they pull all data into skb linear. For TCP, this causes a NULL ptr deref in __tcpv4_gso_segment_list_csum at tcp_hdr(seg->next). Detect invalid geometry due to pull, by checking head_skb size. Don't just drop, as this may blackhole a destination. Convert to be able to pass to regular skb_segment. Approach and description based on a patch by Willem de Bruijn.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-22 13:32 UTC

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/75733986fcb0725c0…
https://git.kernel.org/stable/c/e19201b0c67da5146…
https://git.kernel.org/stable/c/3fdd8c83e83fa5e82…
https://git.kernel.org/stable/c/2d4a83a44428de45b…
https://git.kernel.org/stable/c/17bd3bd82f9f79f3f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c2ea8cab368b9f25b5937a7f07ab1a66e90b8064 , < 75733986fcb0725c0033cde94764389e287b331e (git) Affected: 1f2b859225eb8d1ec974214ce4a581f8c528ae57 , < e19201b0c67da5146eaac06fd3d44bd7945c3448 (git) Affected: bee88cd5bd83d40b8aec4d6cb729378f707f6197 , < 3fdd8c83e83fa5e82f1b5585245c51e0355c9f46 (git) Affected: bee88cd5bd83d40b8aec4d6cb729378f707f6197 , < 2d4a83a44428de45bfe9dccb0192a3711d1097e0 (git) Affected: bee88cd5bd83d40b8aec4d6cb729378f707f6197 , < 17bd3bd82f9f79f3feba15476c2b2c95a9b11ff8 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.10.14 , ≤ 6.10.* (semver) Unaffected: 6.11.3 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)

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                "id": "CVE-2024-49979",
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                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:32:45.687666Z",
                "version": "2.0.3"
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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.

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

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