{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99271","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.404Z","datePublished":"2026-11-07T14:08:45.047Z","dateUpdated":"2026-11-10T18:15:27.042Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-11-10T18:15:27.042Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: line6: Clear prev_fbuf on capture buffer release\n\nA KASAN slab-use-after-free read was reported in submit_audio_out_urb()\nwhen generating an impulse test signal:\n\n  BUG: KASAN: slab-use-after-free in create_impulse_test_signal sound/usb/line6/playback.c:76 [inline]\n  BUG: KASAN: slab-use-after-free in submit_audio_out_urb+0x1848/0x1b20 sound/usb/line6/playback.c:249\n  Read of size 2 at addr ffff888008d74870 by task syz.2.3214/7785\n\n  Allocated by task 11:\n   kmem_cache_alloc_noprof+0x2f0/0x390 mm/slub.c:4144\n   line6_buffer_acquire+0x1a1/0x220 sound/usb/line6/pcm.c:158\n   line6_pcm_acquire+0xb6/0x230 sound/usb/line6/pcm.c:329\n   line6_startup_work+0x3c/0x50 sound/usb/line6/driver.c:728\n\n  Freed by task 7785:\n   kfree+0xf8/0x390 mm/slub.c:6566\n   line6_buffer_release sound/usb/line6/pcm.c:176 [inline]\n   line6_buffer_release+0xa5/0xf0 sound/usb/line6/pcm.c:170\n   __line6_pcm_release sound/usb/line6/pcm.c:305 [inline]\n   line6_pcm_release+0x5a/0x80 sound/usb/line6/pcm.c:313\n   snd_toneport_monitor_put+0x11b/0x190 sound/usb/line6/toneport.c:183\n\nline6pcm->prev_fbuf points into the capture PCM stream buffer\n(line6pcm->in.buffer), which is updated during audio_in_callback() to\nfeed rate synchronization, software monitoring, and impulse test signal\ngeneration on playback side.\n\nWhen all capture streams are closed, line6_buffer_release() frees\npstr->buffer with kfree().  However, it does not clear line6pcm->prev_fbuf.\nIf playback is subsequently started (e.g. via impulse test signal\nvolume control snd_line6_impulse_volume_put()), submit_audio_out_urb()\ndereferences the stale pointer line6pcm->prev_fbuf under in.lock,\nresulting in a slab-use-after-free read.\n\nClear prev_fbuf and prev_fsize in line6_buffer_release() when releasing\nthe capture stream buffer under in.lock, ensuring that no stale buffer\npointer can be accessed by submit_audio_out_urb()."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/line6/pcm.c"],"versions":[{"version":"63e20df1e5b2ef8d871ecbdb6c038d554ed1ca74","lessThan":"d063975ed22cdc2cb609a9828e5f658448193606","status":"affected","versionType":"git"},{"version":"63e20df1e5b2ef8d871ecbdb6c038d554ed1ca74","lessThan":"862d9268f40a6e10cef24eb226e738fb69ce8aa7","status":"affected","versionType":"git"},{"version":"63e20df1e5b2ef8d871ecbdb6c038d554ed1ca74","lessThan":"22c82f33ff0b68d37041adf1dea5533a5863cd31","status":"affected","versionType":"git"},{"version":"63e20df1e5b2ef8d871ecbdb6c038d554ed1ca74","lessThan":"aa118c8f61d59387961d58ffae831c5259a9f222","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/line6/pcm.c"],"versions":[{"version":"4.0","status":"affected"},{"version":"0","lessThan":"4.0","status":"unaffected","versionType":"semver"},{"version":"6.12.117","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.61","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.3.2","lessThanOrEqual":"7.3.*","status":"unaffected","versionType":"semver"},{"version":"7.4-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.12.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"6.18.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"7.3.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0","versionEndExcluding":"7.4-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/d063975ed22cdc2cb609a9828e5f658448193606"},{"url":"https://git.kernel.org/stable/c/862d9268f40a6e10cef24eb226e738fb69ce8aa7"},{"url":"https://git.kernel.org/stable/c/22c82f33ff0b68d37041adf1dea5533a5863cd31"},{"url":"https://git.kernel.org/stable/c/aa118c8f61d59387961d58ffae831c5259a9f222"}],"title":"ALSA: line6: Clear prev_fbuf on capture buffer release","x_generator":{"engine":"bippy-1.2.0"}}}}