Vulnerability-Lookup

GHSA-7G3G-QG84-QXWW

Vulnerability from github – Published: 2024-12-27 15:31 – Updated: 2025-10-07 21:31

Details

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

netfilter: nft_inner: incorrect percpu area handling under softirq

Softirq can interrupt ongoing packet from process context that is walking over the percpu area that contains inner header offsets.

Disable bh and perform three checks before restoring the percpu inner header offsets to validate that the percpu area is valid for this skbuff:

1) If the NFT_PKTINFO_INNER_FULL flag is set on, then this skbuff has already been parsed before for inner header fetching to register.

2) Validate that the percpu area refers to this skbuff using the skbuff pointer as a cookie. If there is a cookie mismatch, then this skbuff needs to be parsed again.

3) Finally, validate if the percpu area refers to this tunnel type.

Only after these three checks the percpu area is restored to a on-stack copy and bh is enabled again.

After inner header fetching, the on-stack copy is stored back to the percpu area.

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-2024-56638"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-27T15:15:23Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_inner: incorrect percpu area handling under softirq\n\nSoftirq can interrupt ongoing packet from process context that is\nwalking over the percpu area that contains inner header offsets.\n\nDisable bh and perform three checks before restoring the percpu inner\nheader offsets to validate that the percpu area is valid for this\nskbuff:\n\n1) If the NFT_PKTINFO_INNER_FULL flag is set on, then this skbuff\n   has already been parsed before for inner header fetching to\n   register.\n\n2) Validate that the percpu area refers to this skbuff using the\n   skbuff pointer as a cookie. If there is a cookie mismatch, then\n   this skbuff needs to be parsed again.\n\n3) Finally, validate if the percpu area refers to this tunnel type.\n\nOnly after these three checks the percpu area is restored to a on-stack\ncopy and bh is enabled again.\n\nAfter inner header fetching, the on-stack copy is stored back to the\npercpu area.",
  "id": "GHSA-7g3g-qg84-qxww",
  "modified": "2025-10-07T21:31:03Z",
  "published": "2024-12-27T15:31:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56638"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53c7314208c865086d78b4e88da53bc33da0b603"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b1d83da254be3bf054965c8f3b1ad976f460ae5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da5cc778e7bf78fe525bc90ec2043f41415c31d9"
    }
  ],
  "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-2024-56638 (GCVE-0-2024-56638)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:02 – Updated: 2026-05-11 20:56

Title

netfilter: nft_inner: incorrect percpu area handling under softirq

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: incorrect percpu area handling under softirq Softirq can interrupt ongoing packet from process context that is walking over the percpu area that contains inner header offsets. Disable bh and perform three checks before restoring the percpu inner header offsets to validate that the percpu area is valid for this skbuff: 1) If the NFT_PKTINFO_INNER_FULL flag is set on, then this skbuff has already been parsed before for inner header fetching to register. 2) Validate that the percpu area refers to this skbuff using the skbuff pointer as a cookie. If there is a cookie mismatch, then this skbuff needs to be parsed again. 3) Finally, validate if the percpu area refers to this tunnel type. Only after these three checks the percpu area is restored to a on-stack copy and bh is enabled again. After inner header fetching, the on-stack copy is stored back to the percpu area.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7018 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/53c7314208c865086…
https://git.kernel.org/stable/c/da5cc778e7bf78fe5…
https://git.kernel.org/stable/c/7b1d83da254be3bf0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 53c7314208c865086d78b4e88da53bc33da0b603 (git) Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < da5cc778e7bf78fe525bc90ec2043f41415c31d9 (git) Affected: 3a07327d10a09379315c844c63f27941f5081e0a , < 7b1d83da254be3bf054965c8f3b1ad976f460ae5 (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.66 , ≤ 6.6.* (semver) Unaffected: 6.12.5 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/netfilter/nf_tables_core.h",
            "net/netfilter/nft_inner.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "53c7314208c865086d78b4e88da53bc33da0b603",
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              "versionType": "git"
            },
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              "lessThan": "da5cc778e7bf78fe525bc90ec2043f41415c31d9",
              "status": "affected",
              "version": "3a07327d10a09379315c844c63f27941f5081e0a",
              "versionType": "git"
            },
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
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              "version": "6.12.5",
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            },
            {
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              "version": "6.13",
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      ],
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              "operator": "OR"
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        }
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    "datePublished": "2024-12-27T15:02:40.796Z",
    "dateReserved": "2024-12-27T15:00:39.839Z",
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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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