media: rtl2832: fix use-after-free in rtl2832_remove()

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Summary

CVECVE-2026-68214
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:09 UTC
Updated2026-08-10 13:20:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: media: rtl2832: fix use-after-free in rtl2832_remove() cancel_delayed_work_sync() is called before i2c_mux_del_adapters() in rtl2832_remove(). While the cancel waits for any running instance of i2c_gate_work to finish, it does not prevent the timer from being rescheduled by a concurrent thread. During probe, the r820t_attach() call attempts I2C transfers through the mux adapter. These transfers go through i2c_mux_master_xfer(), which calls rtl2832_deselect() after the transfer completes, rescheduling i2c_gate_work via schedule_delayed_work(). If this transfer is still in flight when rtl2832_remove() runs, rtl2832_deselect() can reschedule i2c_gate_work after it has been cancelled, causing a use-after-free when kfree(dev) is called. Fix this by calling i2c_mux_del_adapters() before cancel_delayed_work_sync(). Once the mux adapter is unregistered, no new I2C transfers can go through it, so rtl2832_deselect() can no longer reschedule i2c_gate_work. The subsequent cancel_delayed_work_sync() is then guaranteed to be final.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cddcc40b1b1553010acb89add84c64b5d123ec94 9acd5bbbe1df8e487e49488692c224496d4c9e16 git Not specified
CNA Linux Linux affected cddcc40b1b1553010acb89add84c64b5d123ec94 24bef237eef8dd1ebcffb129ba21891ddad0d309 git Not specified
CNA Linux Linux affected cddcc40b1b1553010acb89add84c64b5d123ec94 2c71bda6edc630a1f8c3c45d8df5fc22d234e042 git Not specified
CNA Linux Linux affected cddcc40b1b1553010acb89add84c64b5d123ec94 90d781711418881f8c836c2a859cc2886625d750 git Not specified
CNA Linux Linux affected cddcc40b1b1553010acb89add84c64b5d123ec94 680daf40a82d483949f87f0d8f98639dc47e610c git Not specified
CNA Linux Linux affected 4.7 Not specified
CNA Linux Linux unaffected 4.7 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9acd5bbbe1df8e487e49488692c224496d4c9e16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/680daf40a82d483949f87f0d8f98639dc47e610c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c71bda6edc630a1f8c3c45d8df5fc22d234e042 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/24bef237eef8dd1ebcffb129ba21891ddad0d309 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/90d781711418881f8c836c2a859cc2886625d750 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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