Vulnerability-Lookup

GHSA-W46C-WW47-4HF8

Vulnerability from github – Published: 2025-01-11 15:30 – Updated: 2025-02-03 15:32

Details

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

arm64: ptrace: fix partial SETREGSET for NT_ARM_FPMR

Currently fpmr_set() doesn't initialize the temporary 'fpmr' variable, and a SETREGSET call with a length of zero will leave this uninitialized. Consequently an arbitrary value will be written back to target->thread.uw.fpmr, potentially leaking up to 64 bits of memory from the kernel stack. The read is limited to a specific slot on the stack, and the issue does not provide a write mechanism.

Fix this by initializing the temporary value before copying the regset from userspace, as for other regsets (e.g. NT_PRSTATUS, NT_PRFPREG, NT_ARM_SYSTEM_CALL). In the case of a zero-length write, the existing contents of FPMR will be retained.

Before this patch:

After this patch:

Severity

6.1 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-57878"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-11T15:15:08Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: ptrace: fix partial SETREGSET for NT_ARM_FPMR\n\nCurrently fpmr_set() doesn\u0027t initialize the temporary \u0027fpmr\u0027 variable,\nand a SETREGSET call with a length of zero will leave this\nuninitialized. Consequently an arbitrary value will be written back to\ntarget-\u003ethread.uw.fpmr, potentially leaking up to 64 bits of memory from\nthe kernel stack. The read is limited to a specific slot on the stack,\nand the issue does not provide a write mechanism.\n\nFix this by initializing the temporary value before copying the regset\nfrom userspace, as for other regsets (e.g. NT_PRSTATUS, NT_PRFPREG,\nNT_ARM_SYSTEM_CALL). In the case of a zero-length write, the existing\ncontents of FPMR will be retained.\n\nBefore this patch:\n\n| # ./fpmr-test\n| Attempting to write NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n| SETREGSET(nt=0x40e, len=8) wrote 8 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n|\n| Attempting to write NT_ARM_FPMR (zero length)\n| SETREGSET(nt=0x40e, len=0) wrote 0 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0xffff800083963d50\n\nAfter this patch:\n\n| # ./fpmr-test\n| Attempting to write NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n| SETREGSET(nt=0x40e, len=8) wrote 8 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n|\n| Attempting to write NT_ARM_FPMR (zero length)\n| SETREGSET(nt=0x40e, len=0) wrote 0 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d",
  "id": "GHSA-w46c-ww47-4hf8",
  "modified": "2025-02-03T15:32:01Z",
  "published": "2025-01-11T15:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-57878"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ab73c34e3c5b580721696665eabd799346bc50b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5d71291841aecfe5d8435da2dfa7f58ccd18bc8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-57878 (GCVE-0-2024-57878)

Vulnerability from cvelistv5 – Published: 2025-01-11 14:49 – Updated: 2026-05-11 20:59

Title

arm64: ptrace: fix partial SETREGSET for NT_ARM_FPMR

Summary

In the Linux kernel, the following vulnerability has been resolved: arm64: ptrace: fix partial SETREGSET for NT_ARM_FPMR Currently fpmr_set() doesn't initialize the temporary 'fpmr' variable, and a SETREGSET call with a length of zero will leave this uninitialized. Consequently an arbitrary value will be written back to target->thread.uw.fpmr, potentially leaking up to 64 bits of memory from the kernel stack. The read is limited to a specific slot on the stack, and the issue does not provide a write mechanism. Fix this by initializing the temporary value before copying the regset from userspace, as for other regsets (e.g. NT_PRSTATUS, NT_PRFPREG, NT_ARM_SYSTEM_CALL). In the case of a zero-length write, the existing contents of FPMR will be retained. Before this patch: | # ./fpmr-test | Attempting to write NT_ARM_FPMR::fpmr = 0x900d900d900d900d | SETREGSET(nt=0x40e, len=8) wrote 8 bytes | | Attempting to read NT_ARM_FPMR::fpmr | GETREGSET(nt=0x40e, len=8) read 8 bytes | Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d | | Attempting to write NT_ARM_FPMR (zero length) | SETREGSET(nt=0x40e, len=0) wrote 0 bytes | | Attempting to read NT_ARM_FPMR::fpmr | GETREGSET(nt=0x40e, len=8) read 8 bytes | Read NT_ARM_FPMR::fpmr = 0xffff800083963d50 After this patch: | # ./fpmr-test | Attempting to write NT_ARM_FPMR::fpmr = 0x900d900d900d900d | SETREGSET(nt=0x40e, len=8) wrote 8 bytes | | Attempting to read NT_ARM_FPMR::fpmr | GETREGSET(nt=0x40e, len=8) read 8 bytes | Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d | | Attempting to write NT_ARM_FPMR (zero length) | SETREGSET(nt=0x40e, len=0) wrote 0 bytes | | Attempting to read NT_ARM_FPMR::fpmr | GETREGSET(nt=0x40e, len=8) read 8 bytes | Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 19:54 UTC

CWE

CWE-908 - Use of Uninitialized Resource

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/8ab73c34e3c5b5807…
https://git.kernel.org/stable/c/f5d71291841aecfe5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4035c22ef7d43a6c00d6a6584c60e902b95b46af , < 8ab73c34e3c5b580721696665eabd799346bc50b (git) Affected: 4035c22ef7d43a6c00d6a6584c60e902b95b46af , < f5d71291841aecfe5d8435da2dfa7f58ccd18bc8 (git)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.5 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

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  "containers": {
    "adp": [
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        "metrics": [
          {
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              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 6.1,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
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                "id": "CVE-2024-57878",
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                "timestamp": "2025-10-01T19:54:50.581552Z",
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        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
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            {
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              "status": "unaffected",
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            },
            {
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              "status": "unaffected",
              "version": "6.13",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: ptrace: fix partial SETREGSET for NT_ARM_FPMR\n\nCurrently fpmr_set() doesn\u0027t initialize the temporary \u0027fpmr\u0027 variable,\nand a SETREGSET call with a length of zero will leave this\nuninitialized. Consequently an arbitrary value will be written back to\ntarget-\u003ethread.uw.fpmr, potentially leaking up to 64 bits of memory from\nthe kernel stack. The read is limited to a specific slot on the stack,\nand the issue does not provide a write mechanism.\n\nFix this by initializing the temporary value before copying the regset\nfrom userspace, as for other regsets (e.g. NT_PRSTATUS, NT_PRFPREG,\nNT_ARM_SYSTEM_CALL). In the case of a zero-length write, the existing\ncontents of FPMR will be retained.\n\nBefore this patch:\n\n| # ./fpmr-test\n| Attempting to write NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n| SETREGSET(nt=0x40e, len=8) wrote 8 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n|\n| Attempting to write NT_ARM_FPMR (zero length)\n| SETREGSET(nt=0x40e, len=0) wrote 0 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0xffff800083963d50\n\nAfter this patch:\n\n| # ./fpmr-test\n| Attempting to write NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n| SETREGSET(nt=0x40e, len=8) wrote 8 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d\n|\n| Attempting to write NT_ARM_FPMR (zero length)\n| SETREGSET(nt=0x40e, len=0) wrote 0 bytes\n|\n| Attempting to read NT_ARM_FPMR::fpmr\n| GETREGSET(nt=0x40e, len=8) read 8 bytes\n| Read NT_ARM_FPMR::fpmr = 0x900d900d900d900d"
        }
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    "cveId": "CVE-2024-57878",
    "datePublished": "2025-01-11T14:49:04.088Z",
    "dateReserved": "2025-01-11T14:45:42.023Z",
    "dateUpdated": "2026-05-11T20:59:38.591Z",
    "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.

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.
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