serial: core: do fallible allocations before the console can be registered

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Summary

CVECVE-2026-90337
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:32 UTC
Updated2026-09-17 17:17:32 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: serial: core: do fallible allocations before the console can be registered serial_core_add_one_port() allocates uport->tty_groups after uart_configure_port(), which may register the console. If the allocation fails, the driver unwinds the port while its console remains registered. The earlier uport->name allocation has a related failure path that leaves state->uart_port linked to a port being freed. Failslab reproduced a NULL dereference in PL011 console output and a KASAN use-after-free in i.MX console output after failed binds. Allocate the name and tty_groups before linking the port and configuring it. Reserve space for the optional driver attribute group because config_port() may populate uport->attr_group during configuration.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 266dcff03eed0050b6af11aaf2a61ab837d7ba3f c2aec15f78b2e6ccd9b94216a901248511355982 git Not specified
CNA Linux Linux affected 266dcff03eed0050b6af11aaf2a61ab837d7ba3f 1a0e4fbce5d9c1bc179a35a2fd9ed142664299e3 git Not specified
CNA Linux Linux affected 3.17 Not specified
CNA Linux Linux unaffected 3.17 semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c2aec15f78b2e6ccd9b94216a901248511355982 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a0e4fbce5d9c1bc179a35a2fd9ed142664299e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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