{"id":"CVE-2025-40275","state":"PUBLISHED","title":"ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd\n\nIn snd_usb_create_streams(), for UAC version 3 devices, the Interface\nAssociation Descriptor (IAD) is retrieved via usb_ifnum_to_if(). If this\ncall fails, a fallback routine attempts to obtain the IAD from the next\ninterface and sets a BADD profile. However, snd_usb_mixer_controls_badd()\nassumes that the IAD retrieved from usb_ifnum_to_if() is always valid,\nwithout performing a NULL check. This can lead to a NULL pointer\ndereference when usb_ifnum_to_if() fails to find the interface descriptor.\n\nThis patch adds a NULL pointer check after calling usb_ifnum_to_if() in\nsnd_usb_mixer_controls_badd() to prevent the dereference.\n\nThis issue was discovered by syzkaller, which triggered the bug by sending\na crafted USB device descriptor.","publishedAt":"2025-12-06T21:50:57.914Z","updatedAt":"2026-05-11T21:46:11.980Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"9f282104627be5fbded3102ff9004f753c55a063","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"2762d3ea9c929ca4094541ca517c317ffa94625b","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"57f607c112966c21240c424b33e2cb71e121dcf0","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"cbdbfc756f2990942138ed0138da9303b4dbf9ff","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"85568535893600024d7d8794f4f8b6428b521e0c","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"632108ec072ad64c8c83db6e16a7efee29ebfb74","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/mixer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.18","versionType":"semver"},{"version":"5.4.302","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.247","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.197","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.159","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.59","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.9","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/mixer.c"]}],"references":["https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4","https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6","https://git.kernel.org/stable/c/9f282104627be5fbded3102ff9004f753c55a063","https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b","https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0","https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff","https://git.kernel.org/stable/c/85568535893600024d7d8794f4f8b6428b521e0c","https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40275.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40275","state":"PUBLISHED","datePublished":"2025-12-06T21:50:57.914Z","dateUpdated":"2026-05-11T21:46:11.980Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.184Z"},"containers":{"cna":{"title":"ALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix NULL pointer dereference in snd_usb_mixer_controls_badd\n\nIn snd_usb_create_streams(), for UAC version 3 devices, the Interface\nAssociation Descriptor (IAD) is retrieved via usb_ifnum_to_if(). If this\ncall fails, a fallback routine attempts to obtain the IAD from the next\ninterface and sets a BADD profile. However, snd_usb_mixer_controls_badd()\nassumes that the IAD retrieved from usb_ifnum_to_if() is always valid,\nwithout performing a NULL check. This can lead to a NULL pointer\ndereference when usb_ifnum_to_if() fails to find the interface descriptor.\n\nThis patch adds a NULL pointer check after calling usb_ifnum_to_if() in\nsnd_usb_mixer_controls_badd() to prevent the dereference.\n\nThis issue was discovered by syzkaller, which triggered the bug by sending\na crafted USB device descriptor."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"9f282104627be5fbded3102ff9004f753c55a063","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"2762d3ea9c929ca4094541ca517c317ffa94625b","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"57f607c112966c21240c424b33e2cb71e121dcf0","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"cbdbfc756f2990942138ed0138da9303b4dbf9ff","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"85568535893600024d7d8794f4f8b6428b521e0c","versionType":"git"},{"version":"17156f23e93c0f59e06dd2aaffd06221341caaee","status":"affected","lessThan":"632108ec072ad64c8c83db6e16a7efee29ebfb74","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/mixer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.18","versionType":"semver"},{"version":"5.4.302","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.247","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.197","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.159","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.59","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.9","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/mixer.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/23aea9c74aeea2625aaf4fbcc6beb9d09e30f9e4"},{"url":"https://git.kernel.org/stable/c/c5c08965ab96b16361e69a1e2a0e89dbcb99b5a6"},{"url":"https://git.kernel.org/stable/c/9f282104627be5fbded3102ff9004f753c55a063"},{"url":"https://git.kernel.org/stable/c/2762d3ea9c929ca4094541ca517c317ffa94625b"},{"url":"https://git.kernel.org/stable/c/57f607c112966c21240c424b33e2cb71e121dcf0"},{"url":"https://git.kernel.org/stable/c/cbdbfc756f2990942138ed0138da9303b4dbf9ff"},{"url":"https://git.kernel.org/stable/c/85568535893600024d7d8794f4f8b6428b521e0c"},{"url":"https://git.kernel.org/stable/c/632108ec072ad64c8c83db6e16a7efee29ebfb74"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:46:11.980Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"5.4.302"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"5.10.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"5.15.197"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.1.159"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.6.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.12.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.17.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}