serial: msm: Disable DMA for kernel console UART

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Summary

CVECVE-2026-80886
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 17:17:01 UTC
Updated2026-09-04 17:17:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: serial: msm: Disable DMA for kernel console UART At the moment, concurrent writes from userspace and the kernel to the console can trigger a race condition that results in an infinite loop of the same messages printed over and over again. This is most likely to happen during system startup or shutdown when the init system starts/stops a large number of system services that interact with various kernel code. When userspace writes to the TTY device, the driver initiates an asynchronous DMA transfer and releases the port lock. At the same moment, the kernel printk path might grab the port lock and re-configure the UART controller for PIO, without waiting for the DMA operation to complete. It seems like this collision results in zero progress being reported for the DMA engine, so the same text is printed to the console over and over again. For the kernel console, we want a reliable output path that will be functional even during crashes etc. So rather than implementing complex code to synchronize the kernel console write routines with the userspace DMA write routines, simply disable DMA for the console UART instance. Similar checks exist in many other serial drivers, e.g. 8250_port.c, imx.c, sh-sci.c etc.

Risk And Classification

EPSS: 0.001800000 probability, percentile 0.076730000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 f58e568dc308c8e13f7730c8de2da5ed514e540d git Not specified
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 bb4296de5b538b575978c588cb3738ab8524d01a git Not specified
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 6acea62738ed4cae6746483026706a773b44dad7 git Not specified
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 abc1926c88c189e5d698b91ed6890e09ab5c321d git Not specified
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 2727744ccb5ca59090451451ee94f530b1be04a5 git Not specified
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 d354716245192de2d203f2b35f22ab8dc13595e2 git Not specified
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47 git Not specified
CNA Linux Linux affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 22dd2777e6c180e1c945b00f6d18550979436324 git Not specified
CNA Linux Linux affected 4.4 Not specified
CNA Linux Linux unaffected 4.4 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f58e568dc308c8e13f7730c8de2da5ed514e540d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/abc1926c88c189e5d698b91ed6890e09ab5c321d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bb4296de5b538b575978c588cb3738ab8524d01a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/22dd2777e6c180e1c945b00f6d18550979436324 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d354716245192de2d203f2b35f22ab8dc13595e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2727744ccb5ca59090451451ee94f530b1be04a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6acea62738ed4cae6746483026706a773b44dad7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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