Improper control of a resource through its lifetime in Linux kernel - CVE-2026-74654
Published: August 24, 2026
Vulnerability identifier: #VU144890
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74654
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper state management in serial8250_rx_dma_flush() and serial8250_release_dma() when reopening a port after it is closed during an active RX DMA transfer. A local user can close and reopen the serial port to trigger a kernel Oops and cause a denial of service.
The issue occurs because stale RX state can remain set while the RX DMA channel is unavailable.
Affected software
Linux kernel
How to mitigate CVE-2026-74654
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/9f2444f4c0e4b06f61bae38da87c9c94c78efa86
- https://git.kernel.org/stable/c/ae05d9e50b6b9f246c110b3bdc03676145c2d0d4
- https://git.kernel.org/stable/c/bf4fb620e02962b2b52500a4b3d8420f351eb46a
- https://git.kernel.org/stable/c/d06cfb1add4a2d5b393e9e31f49ebbd168beea49
- https://git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6
- https://git.kernel.org/stable/c/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41
- https://git.kernel.org/stable/c/e7a5d792cf64a2096e18f1d573cc3d01cba15e92
- https://git.kernel.org/stable/c/e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9