{"id":"CVE-2026-74333","state":"PUBLISHED","title":"ASoC: amd: acp-sdw-legacy: Bound DAI link iteration","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: amd: acp-sdw-legacy: Bound DAI link iteration\n\ncreate_sdw_dailinks() walks soc_dais until it finds an entry with\ninitialised cleared, but soc_dais is allocated with exactly num_ends\nentries. If all entries are initialised, the loop reads past the end of\nthe array.\n\nThis was reported by KASAN:\n\n  BUG: KASAN: slab-out-of-bounds in mc_probe+0x26b3/0x2774 [snd_acp_sdw_legacy_mach]\n  Read of size 1\n\nPass the allocated entry count to create_sdw_dailinks() and stop before\nreading past the array.","publishedAt":"2026-08-15T05:58:25.781Z","updatedAt":"2026-10-16T18:55:33.681Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2981d9b0789c44b7375e7d599caf71bd843afc9e","status":"affected","lessThan":"1279bdab5fa1f28c168e54215db506e87c6fac1e","versionType":"git"},{"version":"2981d9b0789c44b7375e7d599caf71bd843afc9e","status":"affected","lessThan":"0230471eef5902207516851dcd47c559571dded2","versionType":"git"},{"version":"2981d9b0789c44b7375e7d599caf71bd843afc9e","status":"affected","lessThan":"d49ecdf327cc91062d2f80996a163cf65fda1e60","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/amd/acp/acp-sdw-legacy-mach.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/amd/acp/acp-sdw-legacy-mach.c"]}],"references":["https://git.kernel.org/stable/c/1279bdab5fa1f28c168e54215db506e87c6fac1e","https://git.kernel.org/stable/c/0230471eef5902207516851dcd47c559571dded2","https://git.kernel.org/stable/c/d49ecdf327cc91062d2f80996a163cf65fda1e60"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74333.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74333","state":"PUBLISHED","datePublished":"2026-08-15T05:58:25.781Z","dateUpdated":"2026-10-16T18:55:33.681Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.885Z"},"containers":{"cna":{"title":"ASoC: amd: acp-sdw-legacy: Bound DAI link iteration","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: amd: acp-sdw-legacy: Bound DAI link iteration\n\ncreate_sdw_dailinks() walks soc_dais until it finds an entry with\ninitialised cleared, but soc_dais is allocated with exactly num_ends\nentries. If all entries are initialised, the loop reads past the end of\nthe array.\n\nThis was reported by KASAN:\n\n  BUG: KASAN: slab-out-of-bounds in mc_probe+0x26b3/0x2774 [snd_acp_sdw_legacy_mach]\n  Read of size 1\n\nPass the allocated entry count to create_sdw_dailinks() and stop before\nreading past the array."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2981d9b0789c44b7375e7d599caf71bd843afc9e","status":"affected","lessThan":"1279bdab5fa1f28c168e54215db506e87c6fac1e","versionType":"git"},{"version":"2981d9b0789c44b7375e7d599caf71bd843afc9e","status":"affected","lessThan":"0230471eef5902207516851dcd47c559571dded2","versionType":"git"},{"version":"2981d9b0789c44b7375e7d599caf71bd843afc9e","status":"affected","lessThan":"d49ecdf327cc91062d2f80996a163cf65fda1e60","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/amd/acp/acp-sdw-legacy-mach.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/amd/acp/acp-sdw-legacy-mach.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1279bdab5fa1f28c168e54215db506e87c6fac1e"},{"url":"https://git.kernel.org/stable/c/0230471eef5902207516851dcd47c559571dded2"},{"url":"https://git.kernel.org/stable/c/d49ecdf327cc91062d2f80996a163cf65fda1e60"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is only reachable during local AMD ACP PCI/platform driver probe (snd_acp63_probe -> acp63_machine_register -> mc_probe); there is no network, Bluetooth, or userspace syscall/ioctl path to create_sdw_dailinks().\nAC:L - On affected AMD SoundWire legacy laptops, when every soc_dais slot is marked initialised the OOB read is deterministic at each boot/probe; KASAN already hit this in mc_probe on real hardware, so no attacker-controlled race or rare timing is required.\nPR:N - Exploitation needs no credentials: mc_probe runs automatically during pre-login kernel initialization when ACPI/PCI matches an amd_sdw machine table on built-in SoundWire hardware, before any authenticated user session exists.\nUI:N - No victim interaction is required beyond normal system boot on vulnerable AMD SoundWire hardware; the bug triggers during driver initialization, not from opening audio devices or mounting filesystems.\nS:U - Impact is confined to kernel heap corruption and crash/privilege escalation within the host kernel; this is not a VM escape, IOMMU bypass, or cross-security-authority boundary.\nC:H - The bug is a slab out-of-bounds read (KASAN: read of size 1) past the soc_dais array, which can disclose adjacent kernel heap objects and satisfies the guidance to rate out-of-bounds reads as High.\nI:H - After the OOB initialised check, the loop can treat adjacent slab memory as a valid asoc_sdw_dailink and call create_sdw_dailink(), corrupting list heads and allocation sizes and enabling further heap corruption or control-flow hijack.\nA:H - KASAN reported slab-out-of-bounds in mc_probe during audio card registration; continued iteration over corrupt structures can kernel oops/panic at boot, denying availability to all users on the machine."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:46:00.787Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74333","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:53:46.521950Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:33.681Z"}}]}}}