CVE-2026-63884

System crash via stale TTM object dereference

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in the Linux kernel i915 TTM purge path from 5.17 allows local users to crash systems during graphics-memory eviction. A busy object can cause ttm_bo_validate() to replace bo->ttm, but i915_ttm_purge() later dereferences the stale i915_tt pointer instead of recasting the replacement. Low-privileged local access to an Intel i915 graphics device is required; the demonstrated consequence is a kernel crash under heavy DG2 use.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel i915 TTM purge path from 5.17 allows local users to crash systems during graphics-memory eviction. A busy object can cause ttm_bo_validate() to replace bo->ttm, but i915_ttm_purge() later dereferences the stale i915_tt pointer instead of recasting the replacement. Low-privileged local access to an Intel i915 graphics device is required; the demonstrated consequence is a kernel crash under heavy DG2 use.

The record

CVE
CVE-2026-63884
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.17
  2. Affected versionversion=7ae034590ceaefd4d37465e3434877acfbadf411 <073bcbc95e9648c976da1654c7590a8d6ee12c2d
  3. Affected versionversion=7ae034590ceaefd4d37465e3434877acfbadf411 <28b22dbaf407598cb3bb1d2c586a6f8018690ac2
  4. Affected versionversion=7ae034590ceaefd4d37465e3434877acfbadf411 <5c4063c87a619e4df954c179d24628636f5db15f
  5. Affected versionversion=7ae034590ceaefd4d37465e3434877acfbadf411 <a29654d451bbffe63d584a4cf64ad0efce6bcf1c
  6. Affected versionversion=7ae034590ceaefd4d37465e3434877acfbadf411 <c9ae7e7e3bc98615364313b08d7acea5239ded0b
  7. Affected versionversion=7ae034590ceaefd4d37465e3434877acfbadf411 <df73f3bc731af1c39ac5405bc59c4e7c6f8e9117

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.17; version=7ae034590ceaefd4d37465e3434877acfbadf411 <073bcbc95e9648c976da1654c7590a8d6ee12c2d; version=7ae034590ceaefd4d37465e3434877acfbadf411 <28b22dbaf407598cb3bb1d2c586a6f8018690ac2; version=7ae034590ceaefd4d37465e3434877acfbadf411 <5c4063c87a619e4df954c179d24628636f5db15f; version=7ae034590ceaefd4d37465e3434877acfbadf411 <a29654d451bbffe63d584a4cf64ad0efce6bcf1c; version=7ae034590ceaefd4d37465e3434877acfbadf411 <c9ae7e7e3bc98615364313b08d7acea5239ded0b; version=7ae034590ceaefd4d37465e3434877acfbadf411 <df73f3bc731af1c39ac5405bc59c4e7c6f8e9117

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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