VulnerabilityPublished 7 Sep 2026Updated 27 Oct 2026

CVE-2025-10263: linux, linux-aws, linux-aws-7.0, linux-gcp, linux-gke, linux-hwe-7.0, linux-realtime vulnerabilities

Affects Linux kernelSource GCVE Database

Authoritative record:CVE-2025-10263· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical · fixed in 7.0.0-1012.12~24.04.1 : patch Linux kernel as a priority.

Data as of 28 Oct 2026, 05:11 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.
Patch: Available – fixed in 7.0.0-1012.12~24.04.1, 7.0.0-31.31~24.04.1, 7.0.0-31.31 +4

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

usn-8726-1

What to do

Upgrade to a fixed release listed under Affected software.

Patches and advisories

ubuntu.com/security/notices/USN-8726-1 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux?arch=source&distro=resolute`Other threats	Affected <7.0.0-31.31	Fixed in 7.0.0-31.31
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=resolute`Other threats	Affected <7.0.0-1012.12	Fixed in 7.0.0-1012.12
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp?arch=source&distro=resolute`Other threats	Affected <7.0.0-1011.11	Fixed in 7.0.0-1011.11
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke?arch=source&distro=resolute`Other threats	Affected <7.0.0-1006.7	Fixed in 7.0.0-1006.7
Ubuntu 26.04 LTSlinux-realtime`pkg:deb/ubuntu/linux-realtime?arch=source&distro=resolute`Other threats	Affected <7.0.0-31.31.1	Fixed in 7.0.0-31.31.1
Ubuntu 24.04 LTSlinux-aws-7.0`pkg:deb/ubuntu/linux-aws-7.0?arch=source&distro=noble`Other threats	Affected <7.0.0-1012.12~24.04.1	Fixed in 7.0.0-1012.12~24.04.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Apply the available security updates by upgrading to the fixed kernel versions listed in the Ubuntu advisory USN-8726-1. After updating, reboot the system to ensure all changes take effect. Due to an unavoidable ABI change in the kernel updates, recompile and reinstall all third-party kernel modules. Follow the vendor's official update instructions to fully remediate the vulnerabilities.

Description

Multiple security vulnerabilities were discovered in the Linux kernel, including a critical issue affecting some Arm processors where a broadcast TLB invalidation could complete before memory writes were globally observed. This flaw could allow a local attacker to write to memory after permissions were revoked, potentially bypassing memory protections or escalating privileges. The update addresses numerous flaws across a wide range of kernel subsystems and architectures. Users must update to fixed kernel versions and reboot to apply the patches. Due to ABI changes, third-party kernel modules require recompilation and reinstallation.

Impact

A local attacker could exploit the Arm processor TLB invalidation flaw to write to memory after permissions have been revoked, potentially bypassing memory protections or escalating privileges. Other fixed issues in the kernel could also allow attackers to compromise system security. The vulnerabilities affect multiple architectures and kernel subsystems, increasing the potential attack surface. Successful exploitation could lead to privilege escalation or system compromise.

References

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