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.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= a7becb58f6b8a3a3efe5d3acfd52e2c107de6772, < 954ee95a03b4d31d4505591bfaba02c24b75776b; >= 75977f5f5c4974c72bbedefbf09ad33ebbaa36f1, < f28a8e1ba4d67a18e4662e5acefd5a4389322366; >= e250b672d40a9e0d97a8895cbb301248bea0fce6, < 695063fc57574dd117b1bc750ca189cf03a2caad; >= dccc0c3ddf8f16071736f98a7d6dd46a2d43e037, < cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c; >= dccc0c3ddf8f16071736f98a7d6dd46a2d43e037, < a24ba0653f7154e671dc8d2bf64682ab2d042792; >= 6.6.143, < 6.6.157; >= 6.12.93, < 6.12.110; >= 6.18.35, < 6.18.51 |
| Linux | Linux | 7.1 |
References
- https://git.kernel.org/stable/c/695063fc57574dd117b1bc750ca189cf03a2caad
- https://git.kernel.org/stable/c/954ee95a03b4d31d4505591bfaba02c24b75776b
- https://git.kernel.org/stable/c/a24ba0653f7154e671dc8d2bf64682ab2d042792
- https://git.kernel.org/stable/c/cca2407794795cecff7f8e5f5a79f4ef6b1d6f6c
- https://git.kernel.org/stable/c/f28a8e1ba4d67a18e4662e5acefd5a4389322366
Timeline
- Published
- Sep 16, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received