Vulnerability-Lookup

GHSA-RJ8M-RJ3G-FQJH

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-24 15:32

Details

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

drm/i915/gem: Prevent overstepping exec array boundary

It is possible for eb_relocate_parse_slow() to call kvfree() on entries outside the original exec array during following scenario inside eb_relocate_parse_slow():

1) eb_copy_relocations() allocates as many as eb->buffer_count copies for exec entries; 2) eb_parse() appends up to two VMAs, right after incrementing eb->buffer_count; 3) cleanup under "out" label uses this incremented buffer_count to release relocation pointers from exec array via kvfree(), not from VMA array.

To amend this problem, ensure that relocation cleanup uses the original exec object count, excluding the VMAs appended by the command parser.

(cherry picked from commit 2a0158925fb943c7ba8f3216e2734952128defc9)

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-2026-99006"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:23Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gem: Prevent overstepping exec array boundary\n\nIt is possible for eb_relocate_parse_slow() to call kvfree() on\nentries outside the original exec array during following\nscenario inside eb_relocate_parse_slow():\n\n1) eb_copy_relocations() allocates as many as eb-\u003ebuffer_count\n   copies for exec entries;\n2) eb_parse() appends up to two VMAs, right after incrementing\n   eb-\u003ebuffer_count;\n3) cleanup under \"out\" label uses this incremented buffer_count\n   to release relocation pointers from exec array via kvfree(),\n   not from VMA array.\n\nTo amend this problem, ensure that relocation cleanup uses the\noriginal exec object count, excluding the VMAs appended by the\ncommand parser.\n\n(cherry picked from commit 2a0158925fb943c7ba8f3216e2734952128defc9)",
  "id": "GHSA-rj8m-rj3g-fqjh",
  "modified": "2026-10-24T15:32:49Z",
  "published": "2026-10-23T15:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99006"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/152fb5083b9333a1cb8629572f9e0f276a404ba6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24c04e80c35ff36947366f6deafddb522eea080c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72d5cbb10d4916a3f8ef9da516c5c0634aca8439"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1c357131fc467c579f65e9a9d1fdc1a6273ae1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebe162db655881a38de43301151ff7ac940602b5"
    }
  ],
  "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-2026-99006 (GCVE-0-2026-99006)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:20 – Updated: 2026-10-24 14:09

Title

drm/i915/gem: Prevent overstepping exec array boundary

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/i915/gem: Prevent overstepping exec array boundary It is possible for eb_relocate_parse_slow() to call kvfree() on entries outside the original exec array during following scenario inside eb_relocate_parse_slow(): 1) eb_copy_relocations() allocates as many as eb->buffer_count copies for exec entries; 2) eb_parse() appends up to two VMAs, right after incrementing eb->buffer_count; 3) cleanup under "out" label uses this incremented buffer_count to release relocation pointers from exec array via kvfree(), not from VMA array. To amend this problem, ensure that relocation cleanup uses the original exec object count, excluding the VMAs appended by the command parser. (cherry picked from commit 2a0158925fb943c7ba8f3216e2734952128defc9)

Severity

7.8 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/24c04e80c35ff3694…
https://git.kernel.org/stable/c/b1c357131fc467c57…
https://git.kernel.org/stable/c/152fb5083b9333a1c…
https://git.kernel.org/stable/c/72d5cbb10d4916a3f…
https://git.kernel.org/stable/c/ebe162db655881a38…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8e4ba491b0ba6fef69270d3c4e48fc517096ef41 , < 24c04e80c35ff36947366f6deafddb522eea080c (git) Affected: 8e4ba491b0ba6fef69270d3c4e48fc517096ef41 , < b1c357131fc467c579f65e9a9d1fdc1a6273ae1d (git) Affected: 8e4ba491b0ba6fef69270d3c4e48fc517096ef41 , < 152fb5083b9333a1cb8629572f9e0f276a404ba6 (git) Affected: 8e4ba491b0ba6fef69270d3c4e48fc517096ef41 , < 72d5cbb10d4916a3f8ef9da516c5c0634aca8439 (git) Affected: 8e4ba491b0ba6fef69270d3c4e48fc517096ef41 , < ebe162db655881a38de43301151ff7ac940602b5 (git)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c"
          ],
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          "versions": [
            {
              "lessThan": "24c04e80c35ff36947366f6deafddb522eea080c",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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            {
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          "defaultStatus": "affected",
          "product": "Linux",
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "5.10"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "5.10",
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                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.10",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
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                }
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              "negate": false,
              "operator": "OR"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gem: Prevent overstepping exec array boundary\n\nIt is possible for eb_relocate_parse_slow() to call kvfree() on\nentries outside the original exec array during following\nscenario inside eb_relocate_parse_slow():\n\n1) eb_copy_relocations() allocates as many as eb-\u003ebuffer_count\n   copies for exec entries;\n2) eb_parse() appends up to two VMAs, right after incrementing\n   eb-\u003ebuffer_count;\n3) cleanup under \"out\" label uses this incremented buffer_count\n   to release relocation pointers from exec array via kvfree(),\n   not from VMA array.\n\nTo amend this problem, ensure that relocation cleanup uses the\noriginal exec object count, excluding the VMAs appended by the\ncommand parser.\n\n(cherry picked from commit 2a0158925fb943c7ba8f3216e2734952128defc9)"
        }
      ],
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        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - A local process reaches the patched cleanup through ioctl(2) \u2192 drm_ioctl() \u2192 i915_gem_execbuffer2_ioctl() \u2192 i915_gem_do_execbuffer() \u2192 eb_relocate_parse_slow(); the exec and relocation arrays originate in local userspace, not a wire protocol.\nAC:L - On affected parser-enabled i915 hardware, the caller controls its relocs_ptr mapping to force eb_copy_relocations(), then submits a parser-using batch so eb_parse() appends VMAs. Any mapping race and heap grooming are controlled by the same caller and can be retried.\nPR:L - I915_GEM_EXECBUFFER2_WR is registered with DRM_RENDER_ALLOW, and drm_ioctl_permit() imposes no DRM_AUTH, DRM_MASTER, DRM_ROOT_ONLY, or CAP_SYS_ADMIN check; an ordinary user with render-node access can invoke it.\nUI:N - The attacker opens the i915 render node, prepares GEM objects and relocation arrays, and issues the execbuffer ioctl directly; no action by another user is required.\nS:U - The erroneous kvfree() corrupts the host kernel heap from a host userspace client, constituting ordinary local-to-kernel escalation without crossing a VM, IOMMU, or other distinct security authority.\nC:H - After eb_parse() increments buffer_count, eb_relocate_parse_slow() reads an untouched post-array slot as an exec object and passes its stale relocs_ptr to kvfree(); reusing a previously freed relocation-copy pointer produces a heap UAF capable of exposing kernel memory.\nI:H - The attacker-groomable kvfree() can double-free or prematurely free a live allocation referenced through the stale relocs_ptr; reclaiming that object while stale users remain provides heap-corruption and control-flow-hijacking primitives.\nA:H - kvfree() of the out-of-array relocs_ptr can immediately oops in kfree() for an invalid address or corrupt the allocator through a double-free; repeated execbuffer submissions can therefore crash or panic the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:09:58.315Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/152fb5083b9333a1cb8629572f9e0f276a404ba6"
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        {
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      "title": "drm/i915/gem: Prevent overstepping exec array boundary",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99006",
    "datePublished": "2026-10-23T12:20:31.415Z",
    "dateReserved": "2026-09-25T10:25:14.385Z",
    "dateUpdated": "2026-10-24T14:09:58.315Z",
    "state": "PUBLISHED"
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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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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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