greybus: raw: fix use-after-free if write is called after disconnect

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Summary

CVECVE-2026-53024
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:13 UTC
Updated2026-06-24 17:17:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: greybus: raw: fix use-after-free if write is called after disconnect If a user writes to the chardev after disconnect has been called, the kernel panics with the following trace (with CONFIG_INIT_ON_FREE_DEFAULT_ON=y): BUG: kernel NULL pointer dereference, address: 0000000000000218 ... Call Trace: <TASK> gb_operation_create_common+0x61/0x180 gb_operation_create_flags+0x28/0xa0 gb_operation_sync_timeout+0x6f/0x100 raw_write+0x7b/0xc7 [gb_raw] vfs_write+0xcf/0x420 ? task_mm_cid_work+0x136/0x220 ksys_write+0x63/0xe0 do_syscall_64+0xa4/0x290 entry_SYSCALL_64_after_hwframe+0x77/0x7f Disconnect calls gb_connection_destroy, which ends up freeing the connection object. When gb_operation_sync is called in the write file operations, its gets a freed connection as parameter and the kernel panics. The gb_connection_destroy cannot be moved out of the disconnect function, as the Greybus subsystem expect all connections belonging to a bundle to be destroyed when disconnect returns. To prevent this bug, use a rw lock to synchronize access between write and disconnect. This guarantees that the write function doesn't try to use a disconnected connection.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 48d6c32bc049abd114e8f0836c0e7d7cbfba7827 git Not specified
CNA Linux Linux affected e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 84265cbd96b97058ef67e3f8be3933667a000835 git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/48d6c32bc049abd114e8f0836c0e7d7cbfba7827 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/84265cbd96b97058ef67e3f8be3933667a000835 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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