media: cobalt: Avoid freeing ALSA private data twice

Summary

In the Linux kernel, the following vulnerability has been resolved: media: cobalt: Avoid freeing ALSA private data twice snd_cobalt_card_create() stores cobsc in sc->private_data and installs snd_cobalt_card_private_free() as sc->private_free. From that point, snd_card_free(sc) releases cobsc through the ALSA card cleanup path. If cobalt_alsa_init() fails after snd_cobalt_card_create(), the err_exit_free path calls snd_card_free(sc) and then kfree(cobsc). That second free releases the same object again. Remove the explicit kfree(cobsc) and leave ownership with the ALSA card. This issue was found by a static analysis checker and confirmed by manual source review.

Timeline

1. Sep 16, 2026, 10:31 AM UTCCVE published
2. Oct 19, 2026, 8:54 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 85756a069c55e0315ac5990806899cfb607b987f · fixed in 75bbf45e3a954e292ae26832d2df40ca2e3ee452; From 85756a069c55e0315ac5990806899cfb607b987f · fixed in fe65028ee72a7e07e572b351891bd7a1f8917d33; From 85756a069c55e0315ac5990806899cfb607b987f · fixed in 61dfa8ded5efc3a25d331fa9ce5cebb85531fe70; From 85756a069c55e0315ac5990806899cfb607b987f · fixed in 42e00371f83c3fc7b99a36bf0229c74ad5d3c7d8; From 85756a069c55e0315ac5990806899cfb607b987f · fixed in 6cbc8a73b3464ebeccc49987b7233b6b087b8504; From 85756a069c55e0315ac5990806899cfb607b987f · fixed in cb1218da234ea15fa14d90e2d049d686874d7aa3; From 85756a069c55e0315ac5990806899cfb607b987f · fixed in 8c6610e230b9355cf7df5a338a0592c0f088c00b; From 85756a069c55e0315ac5990806899cfb607b987f · fixed in 3a7d6b9c4cb5ac18cbd3f1c7f8c7b159c42ba0b1

• Linux Linux

  4.2

• KernelLinux

  From 4.2.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5

References 8