CVE-2026-74654: Linux kernel · serial: 8250_dma: Clear stale RX state on shutdown
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 · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% 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 +26
Exploitation evidence
Disclosed: evidence found.
CVE published 22 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
A patch is available and should be applied. The vendor advisory confirms that this issue has been fixed in updated linux-aws kernel versions. Users should upgrade to the fixed versions to mitigate this vulnerability.
Description
A vulnerability in the Linux kernel's serial 8250_dma driver was resolved. The issue involved the rx_running state not being cleared properly on shutdown, which could cause a kernel Oops when reopening the port due to a NULL channel being passed to the DMAengine API. This flaw was fixed by clearing rx_running after terminating RX DMA and improving the flush helper to avoid passing NULL channels. The vulnerability affects specific linux-aws kernel versions and has a medium severity rating.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74654 (opens in a new tab)
- git.kernel.org/stable/c/9f2444f4c0e4b06f61bae38da87c9c94c78efa86 (opens in a new tab)
- git.kernel.org/stable/c/ae05d9e50b6b9f246c110b3bdc03676145c2d0d4 (opens in a new tab)
- git.kernel.org/stable/c/bf4fb620e02962b2b52500a4b3d8420f351eb46a (opens in a new tab)
- git.kernel.org/stable/c/d06cfb1add4a2d5b393e9e31f49ebbd168beea49 (opens in a new tab)
- git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6 (opens in a new tab)
- git.kernel.org/stable/c/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41 (opens in a new tab)
- git.kernel.org/stable/c/e7a5d792cf64a2096e18f1d573cc3d01cba15e92 (opens in a new tab)
- git.kernel.org/stable/c/e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74654 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74654 (opens in a new tab)
- git.kernel.org/linus/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41 (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)
- ubuntu.com/security/notices/USN-8875-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-2 (opens in a new tab)