Vulnerability-Lookup

GHSA-MFJH-RFF8-525V

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:

x86/bugs: Enable IBPB flush on BPF JIT allocation

Enable hardening against JIT spraying when Spectre-v2 mitigations are in use. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip enabling the IBPB flush if the BPF dispatcher is already using a retpoline sequence.

This hardening applies only when BPF-JIT is in use. Guard the enabling under CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64507"
  ],
  "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\nx86/bugs: Enable IBPB flush on BPF JIT allocation\n\nEnable hardening against JIT spraying when Spectre-v2 mitigations are in\nuse. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip\nenabling the IBPB flush if the BPF dispatcher is already using a retpoline\nsequence.\n\nThis hardening applies only when BPF-JIT is in use. Guard the enabling\nunder CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.",
  "id": "GHSA-mfjh-rff8-525v",
  "modified": "2026-07-25T12:31:38Z",
  "published": "2026-07-25T12:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64507"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/52440e15d9628f8f239373c0f2e5e8f92feea2df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9354248fc1c33a844ca1872761f6668b393e8c37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3af84b0fa00ead01fcd0e28b5d773ff25990a0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb27f3bf915cc0f20fc0c48da9059304e39ebd35"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64507 (GCVE-0-2026-64507)

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

Title

x86/bugs: Enable IBPB flush on BPF JIT allocation

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Enable IBPB flush on BPF JIT allocation Enable hardening against JIT spraying when Spectre-v2 mitigations are in use. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip enabling the IBPB flush if the BPF dispatcher is already using a retpoline sequence. This hardening applies only when BPF-JIT is in use. Guard the enabling under CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/cb27f3bf915cc0f20…
https://git.kernel.org/stable/c/9354248fc1c33a844…
https://git.kernel.org/stable/c/8a4c8af9ae67eb072…
https://git.kernel.org/stable/c/52440e15d9628f8f2…
https://git.kernel.org/stable/c/a3af84b0fa00ead01…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cb27f3bf915cc0f20fc0c48da9059304e39ebd35 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9354248fc1c33a844ca1872761f6668b393e8c37 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 52440e15d9628f8f239373c0f2e5e8f92feea2df (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a3af84b0fa00ead01fcd0e28b5d773ff25990a0d (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/nospec-branch.h",
            "arch/x86/kernel/cpu/bugs.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
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            },
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              "versionType": "git"
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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            {
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              "versionType": "semver"
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/bugs: Enable IBPB flush on BPF JIT allocation\n\nEnable hardening against JIT spraying when Spectre-v2 mitigations are in\nuse. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip\nenabling the IBPB flush if the BPF dispatcher is already using a retpoline\nsequence.\n\nThis hardening applies only when BPF-JIT is in use. Guard the enabling\nunder CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:52:01.008Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cb27f3bf915cc0f20fc0c48da9059304e39ebd35"
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        {
          "url": "https://git.kernel.org/stable/c/52440e15d9628f8f239373c0f2e5e8f92feea2df"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3af84b0fa00ead01fcd0e28b5d773ff25990a0d"
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      ],
      "title": "x86/bugs: Enable IBPB flush on BPF JIT allocation",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64507",
    "datePublished": "2026-07-25T08:52:01.008Z",
    "dateReserved": "2026-07-19T15:36:31.793Z",
    "dateUpdated": "2026-07-25T08:52:01.008Z",
    "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.

Action not permitted

GHSA-MFJH-RFF8-525V

CVE-2026-64507 (GCVE-0-2026-64507)

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Sightings

Nomenclature