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VulnerabilityPublished Updated

CVE-2025-10263: Arm C1-Ultra · Race Condition

Affects Arm C1-UltraSource CVE Database V5

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Not known to be exploited · CVSS 9.1 Critical.

Data as of 30 Oct 2026, 20:25 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 45% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
ArmC1-UltraAffected
  • =0
Fixed in–
ArmC1-PremiumAffected
  • =0
Fixed in–
ArmNeoverse V3Affected
  • =0
Fixed in–
ArmNeoverse V3AEAffected
  • =0
Fixed in–
ArmNeoverse V1Affected
  • =0
Fixed in–
ArmNeoverse N2Affected
  • =0
Fixed in–

AI-suggested

Red Hat is actively addressing this vulnerability and has released updates for affected products such as Red Hat OpenShift Container Platform 4.12.96. Users should apply these updates promptly when available. There is no indication that the vulnerability is already mitigated or that no action is required. No specific workarounds or mitigations beyond applying vendor patches are documented. Monitor vendor advisories for updated remediation guidance.

Description

CVE-2025-10263 is a critical race condition vulnerability in the Linux kernel on ARM processors, including Arm C1-Ultra and related cores. It involves improper synchronization during Translation Lookaside Buffer Invalidation (TLBI) operations when memory permissions change, allowing a local attacker to write to memory resources owned by higher privilege levels. This flaw can enable privilege escalation to kernel level or guest VM escape to the hypervisor, potentially leading to complete system compromise. Red Hat has acknowledged the issue and is working on fixes for affected products such as Red Hat OpenShift Container Platform 4.12.96. No known exploits are reported in the wild at this time.

Reports on CVE-2025-10263

References

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