github - ghsa-r878-fwjf-3cg7

GHSA-R878-FWJF-3CG7

Vulnerability from github – Published: 2025-05-20 18:30 – Updated: 2025-11-03 21:33

Details

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

tracing: Verify event formats that have "%*p.."

The trace event verifier checks the formats of trace events to make sure that they do not point at memory that is not in the trace event itself or in data that will never be freed. If an event references data that was allocated when the event triggered and that same data is freed before the event is read, then the kernel can crash by reading freed memory.

The verifier runs at boot up (or module load) and scans the print formats of the events and checks their arguments to make sure that dereferenced pointers are safe. If the format uses "%*p.." the verifier will ignore it, and that could be dangerous. Cover this case as well.

Also add to the sample code a use case of "%*pbl".

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37938"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-20T16:15:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Verify event formats that have \"%*p..\"\n\nThe trace event verifier checks the formats of trace events to make sure\nthat they do not point at memory that is not in the trace event itself or\nin data that will never be freed. If an event references data that was\nallocated when the event triggered and that same data is freed before the\nevent is read, then the kernel can crash by reading freed memory.\n\nThe verifier runs at boot up (or module load) and scans the print formats\nof the events and checks their arguments to make sure that dereferenced\npointers are safe. If the format uses \"%*p..\" the verifier will ignore it,\nand that could be dangerous. Cover this case as well.\n\nAlso add to the sample code a use case of \"%*pbl\".",
  "id": "GHSA-r878-fwjf-3cg7",
  "modified": "2025-11-03T21:33:55Z",
  "published": "2025-05-20T18:30:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37938"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03127354027508d076073b020d3070990fd6a958"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/04b80d45ecfaf780981d6582899e3ab205e4aa08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d11fac941d83509be4e6a21038281d6d96da50c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6854c87ac823181c810f8c07489ba543260c0023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7204fd1758c0caf1938e8a59809a1fdf28a8114"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea8d7647f9ddf1f81e2027ed305299797299aa03"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-37938 (GCVE-0-2025-37938)

Vulnerability from cvelistv5 – Published: 2025-05-20 15:34 – Updated: 2025-11-03 19:57

Summary

In the Linux kernel, the following vulnerability has been resolved: tracing: Verify event formats that have "%*p.." The trace event verifier checks the formats of trace events to make sure that they do not point at memory that is not in the trace event itself or in data that will never be freed. If an event references data that was allocated when the event triggered and that same data is freed before the event is read, then the kernel can crash by reading freed memory. The verifier runs at boot up (or module load) and scans the print formats of the events and checks their arguments to make sure that dereferenced pointers are safe. If the format uses "%*p.." the verifier will ignore it, and that could be dangerous. Cover this case as well. Also add to the sample code a use case of "%*pbl".

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/6854c87ac823181c8…
	https://git.kernel.org/stable/c/4d11fac941d83509b…
	https://git.kernel.org/stable/c/03127354027508d07…
	https://git.kernel.org/stable/c/04b80d45ecfaf7809…
	https://git.kernel.org/stable/c/c7204fd1758c0caf1…
	https://git.kernel.org/stable/c/ea8d7647f9ddf1f81…

Impacted products

Vendor

Product

Version

Linux

Affected: 5013f454a352cce8e62162976026a9c472595e42 , < 6854c87ac823181c810f8c07489ba543260c0023 (git)
Affected: 5013f454a352cce8e62162976026a9c472595e42 , < 4d11fac941d83509be4e6a21038281d6d96da50c (git)
Affected: 5013f454a352cce8e62162976026a9c472595e42 , < 03127354027508d076073b020d3070990fd6a958 (git)
Affected: 5013f454a352cce8e62162976026a9c472595e42 , < 04b80d45ecfaf780981d6582899e3ab205e4aa08 (git)
Affected: 5013f454a352cce8e62162976026a9c472595e42 , < c7204fd1758c0caf1938e8a59809a1fdf28a8114 (git)
Affected: 5013f454a352cce8e62162976026a9c472595e42 , < ea8d7647f9ddf1f81e2027ed305299797299aa03 (git)

Linux

Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.1.136 , ≤ 6.1.* (semver)
Unaffected: 6.6.89 , ≤ 6.6.* (semver)
Unaffected: 6.12.26 , ≤ 6.12.* (semver)
Unaffected: 6.13.11 , ≤ 6.13.* (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-R878-FWJF-3CG7

CVE-2025-37938 (GCVE-0-2025-37938)

Tags

Sightings

Nomenclature