CVE-2026-64528: Linux kernel · tty: serial: samsung: Remove redundant port lock acquisition in rx helpers
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +67
Exploitation evidence
Disclosed: evidence found.
CVE published 27 Jul 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 fix is available and should be applied by updating to the patched Linux kernel versions. Users should refer to their distribution's security advisories, such as the Ubuntu Security Notice USN-8618-1, for the appropriate kernel updates. No additional mitigation is required beyond applying the official patch.
Description
A deadlock vulnerability in the Linux kernel's Samsung serial driver was resolved by removing redundant port lock acquisitions in receive helper functions. The issue occurs when console flow control is enabled, causing spinlock re-acquisition on the same CPU and resulting in a deadlock. This flaw affects multiple Linux kernel versions and was fixed in official updates.
References
- ubuntu.com/security/CVE-2026-64528 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-64528 (opens in a new tab)
- git.kernel.org/linus/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9 (opens in a new tab)
- git.kernel.org/stable/c/10014eb7eee351f7b587f8ac85830f0c9343cb9a (opens in a new tab)
- git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae (opens in a new tab)
- git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2 (opens in a new tab)
- git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711 (opens in a new tab)
- git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9 (opens in a new tab)
- git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350 (opens in a new tab)
- git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74 (opens in a new tab)
- git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e (opens in a new tab)
- ubuntu.com/security/notices/USN-8618-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8663-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8664-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8728-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)