Vulnerability-Lookup

CVE-2026-64508 (GCVE-0-2026-64508)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:52 – Updated: 2026-07-25 08:52

Title

bpf: Support for hardening against JIT spraying

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Support for hardening against JIT spraying The BPF JIT allocator packs many small programs into larger executable allocations and reuses space within those allocations as programs are loaded and freed. When fresh code is written into space that a previous program occupied, an indirect jump into the new program can reuse a branch prediction left behind by the old one. Flush the indirect branch predictors before reusing JIT memory so that indirect jumps into a newly written program don't reuse predictions from an old program that occupied the same space. Introduce bpf_arch_pred_flush_enabled static key and bpf_arch_pred_flush static call for flushing the branch predictors on JIT memory reuse. Architectures that need a flush, can update it to a predictor flush function. By default, its a NOP and does not emit any CALL. Allocations larger than a pack are not covered by this flush. That is safe because cBPF programs (the unprivileged attack surface) are bounded well below a pack size. Issue a warning if this assumption is ever violated while the flush is active.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/6e52c240c43a601b6…
https://git.kernel.org/stable/c/eed774da601268dae…
https://git.kernel.org/stable/c/8ff183ee4d8c45296…
https://git.kernel.org/stable/c/7a6c171c6a1ac6d15…
https://git.kernel.org/stable/c/96cce16e26dd02a86…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6e52c240c43a601b681e3a4e58fc5685114d4726 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < eed774da601268dae674e14d54a15e3624691f52 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8ff183ee4d8c452960df58175a094828c0513b2e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7a6c171c6a1ac6d1509752dac131d941a3de0b37 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 96cce16e26dd02a8678f1e87f88a4b5cdb63b995 (git) Affected: 0 , < 6.6.145 (semver) Affected: 0 , < 6.12.97 (semver) Affected: 0 , < 6.18.39 (semver) Affected: 0 , < 7.1.4 (semver)
Linux	Linux	Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc2 , ≤ * (original_commit_for_fix)

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JSON

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    "datePublished": "2026-07-25T08:52:01.732Z",
    "dateReserved": "2026-07-19T15:36:31.793Z",
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  }
}

GHSA-667G-8HV2-VMXJ

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

bpf: Support for hardening against JIT spraying

The BPF JIT allocator packs many small programs into larger executable allocations and reuses space within those allocations as programs are loaded and freed. When fresh code is written into space that a previous program occupied, an indirect jump into the new program can reuse a branch prediction left behind by the old one.

Flush the indirect branch predictors before reusing JIT memory so that indirect jumps into a newly written program don't reuse predictions from an old program that occupied the same space.

Introduce bpf_arch_pred_flush_enabled static key and bpf_arch_pred_flush static call for flushing the branch predictors on JIT memory reuse. Architectures that need a flush, can update it to a predictor flush function. By default, its a NOP and does not emit any CALL.

Allocations larger than a pack are not covered by this flush. That is safe because cBPF programs (the unprivileged attack surface) are bounded well below a pack size. Issue a warning if this assumption is ever violated while the flush is active.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64508"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:36Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Support for hardening against JIT spraying\n\nThe BPF JIT allocator packs many small programs into larger executable\nallocations and reuses space within those allocations as programs are\nloaded and freed. When fresh code is written into space that a previous\nprogram occupied, an indirect jump into the new program can reuse a branch\nprediction left behind by the old one.\n\nFlush the indirect branch predictors before reusing JIT memory so that\nindirect jumps into a newly written program don\u0027t reuse predictions from an\nold program that occupied the same space.\n\nIntroduce bpf_arch_pred_flush_enabled static key and bpf_arch_pred_flush\nstatic call for flushing the branch predictors on JIT memory reuse.\nArchitectures that need a flush, can update it to a predictor flush\nfunction. By default, its a NOP and does not emit any CALL.\n\nAllocations larger than a pack are not covered by this flush. That is safe\nbecause cBPF programs (the unprivileged attack surface) are bounded well\nbelow a pack size. Issue a warning if this assumption is ever violated\nwhile the flush is active.",
  "id": "GHSA-667g-8hv2-vmxj",
  "modified": "2026-07-25T12:31:38Z",
  "published": "2026-07-25T12:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64508"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e52c240c43a601b681e3a4e58fc5685114d4726"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a6c171c6a1ac6d1509752dac131d941a3de0b37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ff183ee4d8c452960df58175a094828c0513b2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96cce16e26dd02a8678f1e87f88a4b5cdb63b995"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eed774da601268dae674e14d54a15e3624691f52"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-64508 (GCVE-0-2026-64508)

GHSA-667G-8HV2-VMXJ

Tags

Sightings

Nomenclature