CVE-2026-89900

media: cec: core: Fix kmemleak due to missed rc_free_device() call

State: Published
Severity: Not scored
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

media: cec: core: Fix kmemleak due to missed rc_free_device() call

The commit dccc0c3ddf8f ("media: rc: fix race between unregister and urb/irq callbacks") removed the implicit call to rc_free_device() from rc_unregister_device(). However, the commit missed to remove the NULL assignment of adap->rc that is now causing rc_free_device() to never be called on an allocated rc device.

kmemleak reports following after e.g. dw-hdmi unbind:

unreferenced object 0xffff00010ac10000 (size 4096): comm "kworker/u16:1", pid 39, jiffies 4294897739 hex dump (first 32 bytes): 20 23 4b 0a 01 00 ff ff 08 00 c1 0a 01 00 ff ff #K............. 08 00 c1 0a 01 00 ff ff 00 00 00 00 00 00 00 00 ................ backtrace (crc e11baccc): kmemleak_alloc+0x38/0x44 __kmalloc_cache_noprof+0x4a8/0x5e0 rc_allocate_device+0x48/0x2a0 cec_allocate_adapter+0x3ac/0x800 dw_hdmi_cec_probe+0x264/0x634 platform_probe+0xc0/0x188 really_probe+0x4a4/0x8e0 __driver_probe_device+0x2f8/0x440 driver_probe_device+0x60/0x160 __device_attach_driver+0x1a0/0x2a0 bus_for_each_drv+0x100/0x1a0 __device_attach+0x174/0x350 device_initial_probe+0x90/0xb0 bus_probe_device+0x4c/0x120 device_add+0xdec/0x116c platform_device_add+0x354/0x598

Remove the assignment of adap->rc to NULL to let cec_delete_adapter() free the allocated rc device after last user of the cec device exits to fix the kmemleak.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	a7becb58f6b8a3a3efe5d3acfd52e2c107de6772 to before 954ee95a03b4d31d4505591bfaba02c24b75776bAffected 75977f5f5c4974c72bbedefbf09ad33ebbaa36f1 to before f28a8e1ba4d67a18e4662e5acefd5a4389322366Affected e250b672d40a9e0d97a8895cbb301248bea0fce6 to before 695063fc57574dd117b1bc750ca189cf03a2caadAffected dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 to before cca2407794795cecff7f8e5f5a79f4ef6b1d6f6cAffected dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 to before a24ba0653f7154e671dc8d2bf64682ab2d042792Affected 6.6.143 to before 6.6.157Affected 6.12.93 to before 6.12.110Affected 6.18.35 to before 6.18.51Affected
LinuxLinux	7.1Affected before 7.1Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

a7becb58f6b8a3a3efe5d3acfd52e2c107de6772 to before 954ee95a03b4d31d4505591bfaba02c24b75776bAffected
75977f5f5c4974c72bbedefbf09ad33ebbaa36f1 to before f28a8e1ba4d67a18e4662e5acefd5a4389322366Affected
e250b672d40a9e0d97a8895cbb301248bea0fce6 to before 695063fc57574dd117b1bc750ca189cf03a2caadAffected
dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 to before cca2407794795cecff7f8e5f5a79f4ef6b1d6f6cAffected
dccc0c3ddf8f16071736f98a7d6dd46a2d43e037 to before a24ba0653f7154e671dc8d2bf64682ab2d042792Affected
6.6.143 to before 6.6.157Affected
6.12.93 to before 6.12.110Affected
6.18.35 to before 6.18.51Affected

LinuxLinux

7.1Affected
before 7.1Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.51 through 6.18.*Not affected
7.2.5 through 7.2.*Not affected
7.3 and laterNot affected

References

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