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CVE Record

CVE-2026-31490: drm/xe/pf: Fix use-after-free in migration restore

In the Linux kernel, the following vulnerability has been resolved: drm/xe/pf: Fix use-after-free in migration restore When an error is returned from xe_sriov_pf_migration_restore_produce(), the data pointer is not set to NULL, which can trigger use-after-free in subsequent .write() calls. Set the pointer to NULL upon error to fix the problem. (cherry picked from commit 4f53d8c6d23527d734fe3531d08e15cb170a0819)

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux graphics-driver flaw can leave a freed memory reference after a failed migration restore. A later write may reuse that invalid reference, potentially compromising system confidentiality, integrity, or availability. Exploitation requires local, low-privileged access according to the supplied CVSS vector.

Executive priority

Treat as a high-priority kernel update where the affected Xe virtualization path is present, particularly on shared systems granting local accounts. Other Linux systems should first be checked for driver, feature, and version applicability before emergency action.

Technical view

In drm/xe PF migration restore, an error from xe_sriov_pf_migration_restore_produce() leaves the data pointer non-NULL. Subsequent .write() calls can access freed memory. The referenced stable changes correct the condition by setting the pointer to NULL on error.

Likely exposure

Exposure is limited to Linux systems running an affected kernel and exercising the drm/xe PF SR-IOV migration-restore path. The supplied version data references 6.19, 6.19.11, and 7.0 boundaries, but does not unambiguously express the complete affected range.

Exploitation context

The CVSS vector describes a local, low-complexity attack requiring low privileges and no user interaction. The bundle marks KEV false, and no cited source reports active exploitation. Public proof-of-concept availability is not established.

Researcher notes

The critical state transition is the producer error path retaining a stale data pointer, followed by a later write callback. The sources establish the use-after-free and NULL-reset correction, but do not document exploit reliability, demonstrated privilege escalation, affected hardware, or public exploitation.

Mitigation direction

  • Update to a vendor-supported kernel build containing a referenced stable fix.
  • Review distribution or appliance vendor guidance to identify corrected packages for every affected deployment.
  • Prioritize systems where Xe PF SR-IOV migration restore is enabled or used.

Validation and detection

  • Inventory running Linux kernel versions on systems using drm/xe PF SR-IOV migration restore.
  • Map each package build to a referenced fix commit or explicit vendor confirmation.
  • Confirm the corrected kernel is active after maintenance, not merely installed.
  • Retest migration restore error handling through approved defensive regression testing.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2026-31490 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2026-31490Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1ed30397c0b92b97381dbd11362fdbbf93e046d2, 1ed30397c0b92b97381dbd11362fdbbf93e046d2unaffected
LinuxLinux6.19, 0, 6.19.11, 7.0affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.