# Race condition in Arm C1-Ultra and others CVE record · `CVE-2025-10263` - **Identifiers:** `CVE-2025-10263` - **State:** Confirmed - **Severity:** CVSS 9.1 Critical - **Critical:** Yes: CVSS 9+ - **CNA:** Arm - **Weakness (CWE):** [CWE-266](https://cwe.mitre.org/data/definitions/266.html) · [CWE-362](https://cwe.mitre.org/data/definitions/362.html) - **Tags:** [Privilege escalation](https://agentprime.io/advisories/tag/privilege-escalation.md) · [Race condition](https://agentprime.io/advisories/tag/race-condition.md) - **Technologies:** [Arm C1-Ultra](https://agentprime.io/advisories/technology/arm-c1-ultra.md) · [Arm C1-Premium](https://agentprime.io/advisories/technology/arm-c1-premium.md) · [Arm Neoverse V3](https://agentprime.io/advisories/technology/arm-neoverse-v3.md) · [Arm Neoverse V3AE](https://agentprime.io/advisories/technology/arm-neoverse-v3ae.md) · [Arm Neoverse V1](https://agentprime.io/advisories/technology/arm-neoverse-v1.md) · [Arm Neoverse N2](https://agentprime.io/advisories/technology/arm-neoverse-n2.md) · [Arm Neoverse N1](https://agentprime.io/advisories/technology/arm-neoverse-n1.md) · [Arm Cortex-X925](https://agentprime.io/advisories/technology/arm-cortex-x925.md) · [Arm Cortex-X4](https://agentprime.io/advisories/technology/arm-cortex-x4.md) · [Arm Cortex-X3](https://agentprime.io/advisories/technology/arm-cortex-x3.md) · [Arm Cortex-X2](https://agentprime.io/advisories/technology/arm-cortex-x2.md) · [Arm Cortex-X1](https://agentprime.io/advisories/technology/arm-cortex-x1.md) · [Arm Cortex-X1C](https://agentprime.io/advisories/technology/arm-cortex-x1c.md) · [Arm Cortex-A710](https://agentprime.io/advisories/technology/arm-cortex-a710.md) · [Arm Cortex-A78](https://agentprime.io/advisories/technology/arm-cortex-a78.md) · [Arm Cortex-A78AE](https://agentprime.io/advisories/technology/arm-cortex-a78ae.md) · [Arm Cortex-A78C](https://agentprime.io/advisories/technology/arm-cortex-a78c.md) · [Arm Cortex-A77](https://agentprime.io/advisories/technology/arm-cortex-a77.md) · [Arm Cortex-A76](https://agentprime.io/advisories/technology/arm-cortex-a76.md) · [Arm Cortex-A76AE](https://agentprime.io/advisories/technology/arm-cortex-a76ae.md) - **Published:** 9 Jun 2026 - **Updated:** 4 Sept 2026 - **Reviewed by a person:** No Published by the CVE Program (CNA: Arm) at 9 Jun 2026, 09:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. ## Critical Critical, because: - CVSS score 9.1: 9.0 or more. How we decide what’s critical: ## Affected products, as the CNA wrote them - Vendor: Arm. Product: C1-Ultra. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: C1-Premium. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Neoverse V3. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Neoverse V3AE. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Neoverse V1. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Neoverse N2. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Neoverse N1. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-X925. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-X4. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-X3. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-X2. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-X1. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-X1C. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-A710. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-A78. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-A78AE. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-A78C. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-A77. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-A76. - affected: `0` - Other versions: unaffected - Vendor: Arm. Product: Cortex-A76AE. - affected: `0` - Other versions: unaffected ## Not analysed yet We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter. ## Severity and exploitation - 9.1 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`, from ADP (CISA-ADP) (used for this record) - 8.4 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`, from ADP (redhat-SADP) - **CISA KEV:** Not listed. - **EPSS:** 0.0054, the 45th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline This record came from the full history of the CVE Program, published 9 Jun 2026. New records show when each source confirmed them. ## Sources - [CVE List: CVE-2025-10263](https://www.cve.org/CVERecord?id=CVE-2025-10263) - [NVD: CVE-2025-10263](https://nvd.nist.gov/vuln/detail/CVE-2025-10263) ### References from the CNA - Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .