Vulnerability-Lookup

GHSA-XF4C-FRC6-WRRH

Vulnerability from github – Published: 2025-02-27 21:32 – Updated: 2025-02-27 21:32

Details

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

netfilter: nf_tables: avoid skb access on nf_stolen

When verdict is NF_STOLEN, the skb might have been freed.

When tracing is enabled, this can result in a use-after-free: 1. access to skb->nf_trace 2. access to skb->mark 3. computation of trace id 4. dump of packet payload

To avoid 1, keep a cached copy of skb->nf_trace in the trace state struct. Refresh this copy whenever verdict is != STOLEN.

Avoid 2 by skipping skb->mark access if verdict is STOLEN.

3 is avoided by precomputing the trace id.

Only dump the packet when verdict is not "STOLEN".

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-2022-49622"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:37Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: avoid skb access on nf_stolen\n\nWhen verdict is NF_STOLEN, the skb might have been freed.\n\nWhen tracing is enabled, this can result in a use-after-free:\n1. access to skb-\u003enf_trace\n2. access to skb-\u003emark\n3. computation of trace id\n4. dump of packet payload\n\nTo avoid 1, keep a cached copy of skb-\u003enf_trace in the\ntrace state struct.\nRefresh this copy whenever verdict is != STOLEN.\n\nAvoid 2 by skipping skb-\u003emark access if verdict is STOLEN.\n\n3 is avoided by precomputing the trace id.\n\nOnly dump the packet when verdict is not \"STOLEN\".",
  "id": "GHSA-xf4c-frc6-wrrh",
  "modified": "2025-02-27T21:32:14Z",
  "published": "2025-02-27T21:32:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49622"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0016d5d46d7440729a3132f61a8da3bf7f84e2ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e34b9ed96ce3b06c79bf884009b16961ca478f87"
    }
  ],
  "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-2022-49622 (GCVE-0-2022-49622)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:23 – Updated: 2026-08-05 08:55

Title

netfilter: nf_tables: avoid skb access on nf_stolen

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: avoid skb access on nf_stolen When verdict is NF_STOLEN, the skb might have been freed. When tracing is enabled, this can result in a use-after-free: 1. access to skb->nf_trace 2. access to skb->mark 3. computation of trace id 4. dump of packet payload To avoid 1, keep a cached copy of skb->nf_trace in the trace state struct. Refresh this copy whenever verdict is != STOLEN. Avoid 2 by skipping skb->mark access if verdict is STOLEN. 3 is avoided by precomputing the trace id. Only dump the packet when verdict is not "STOLEN".

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-27 18:15 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root Scorecard

References

2 references

URL	Tags
https://git.kernel.org/stable/c/0016d5d46d7440729…
https://git.kernel.org/stable/c/e34b9ed96ce3b06c7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 , < 0016d5d46d7440729a3132f61a8da3bf7f84e2ba (git) Affected: 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 , < e34b9ed96ce3b06c79bf884009b16961ca478f87 (git)
Linux	Linux	Affected: 4.10 Unaffected: 0 , < 4.10 (semver) Unaffected: 5.18.13 , ≤ 5.18.* (semver) Unaffected: 5.19 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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            }
          },
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              "content": {
                "id": "CVE-2022-49622",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T18:15:30.357017Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_tables.h",
            "net/netfilter/nf_tables_core.c",
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          ],
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              "versionType": "git"
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              "lessThan": "e34b9ed96ce3b06c79bf884009b16961ca478f87",
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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            "net/netfilter/nf_tables_core.c",
            "net/netfilter/nf_tables_trace.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "4.10",
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                },
                {
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              "negate": false,
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: avoid skb access on nf_stolen\n\nWhen verdict is NF_STOLEN, the skb might have been freed.\n\nWhen tracing is enabled, this can result in a use-after-free:\n1. access to skb-\u003enf_trace\n2. access to skb-\u003emark\n3. computation of trace id\n4. dump of packet payload\n\nTo avoid 1, keep a cached copy of skb-\u003enf_trace in the\ntrace state struct.\nRefresh this copy whenever verdict is != STOLEN.\n\nAvoid 2 by skipping skb-\u003emark access if verdict is STOLEN.\n\n3 is avoided by precomputing the trace id.\n\nOnly dump the packet when verdict is not \"STOLEN\"."
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          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached by configuring nf_tables rules over netlink and triggering them in a local network namespace; nftables/netfilter is scored as Local, not remotely exploitable by itself.\nAC:L - An attacker who can install rules fully controls enabling nftrace and a STOLEN path (e.g. synproxy/fwd that consume_skb), then triggers the UAF synchronously on a locally generated packet with no race or external conditions.\nPR:L - nfnetlink requires CAP_NET_ADMIN, but that capability is obtainable in an unprivileged user+network namespace (unshare -Urn), so privileges required are Low rather than High.\nUI:N - No victim action is needed; the attacker installs the rules and sends packets that hit the chain themselves.\nS:U - This is a standard in-kernel use-after-free enabling local privilege escalation within the same OS security authority, not a VM/IOMMU/sandbox boundary escape.\nC:H - Use-after-free of the skb allows reading freed slab memory (including via nft_trace_notify packet/header dumps to netlink), which per guidance is High confidentiality impact.\nI:H - A kernel skb UAF is heap-corruptible via spraying and can yield write/control-flow primitives, so integrity impact is High.\nA:H - Accessing the freed skb in the tracing path can cause kernel oops/panic or otherwise crash the system, so availability impact is High."
            }
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        }
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        "dateUpdated": "2026-08-05T08:55:51.862Z",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49622",
    "datePublished": "2025-02-26T02:23:39.341Z",
    "dateReserved": "2025-02-26T02:21:30.420Z",
    "dateUpdated": "2026-08-05T08:55:51.862Z",
    "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.

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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GHSA-XF4C-FRC6-WRRH

CVE-2022-49622 (GCVE-0-2022-49622)

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