CVE-2026-74273: Linux kernel · cxl/region: Block region delete during region creation
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 7.0.0-1014.14~24.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1014.14~24.04.1, 7.0.0-1017.17~24.04.1, 7.0.0-1016.16~24.04.1 +11
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 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.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
An official patch is available and should be applied to affected linux-hwe-edge kernel versions. The fix prevents region deletion during critical periods by expanding the locking mechanism. Users should update to patched kernel versions to remediate this issue.
Description
A vulnerability in the Linux kernel's cxl/region subsystem allowed userspace to delete a region during critical periods of region creation, violating kernel assumptions about region registration and lifecycle. This could cause inconsistencies in kernel data structures related to Compute Express Link (CXL) regions. The issue has been resolved by expanding and renaming the range lock to "regions_lock" to block region deletion during these critical windows. The vulnerability affects specific linux-hwe-edge kernel versions and has been patched.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74273 (opens in a new tab)
- git.kernel.org/stable/c/b0b6a9c65cb72c901fdcc6ae83d7afd70cdca1b8 (opens in a new tab)
- git.kernel.org/stable/c/d91feb88692e81b00cd22f0125cfcd04970b4a0b (opens in a new tab)
- ubuntu.com/security/CVE-2026-74273 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74273 (opens in a new tab)
- git.kernel.org/linus/d91feb88692e81b00cd22f0125cfcd04970b4a0b (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-3 (opens in a new tab)
- git.kernel.org/stable/c/8efa9fcc1d31b29b31e0ac4efe48624a729796bc (opens in a new tab)
- git.kernel.org/stable/c/98c7e206af48b4433b2192cc1a538db2acc49876 (opens in a new tab)
- git.kernel.org/stable/c/ecc86a28dc27509da511bb3f8c309750233e3177 (opens in a new tab)