{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-26654", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.144Z", "datePublished": "2024-04-01T08:35:19.763Z", "dateUpdated": "2026-08-05T11:26:33.368Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:26:33.368Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: sh: aica: reorder cleanup operations to avoid UAF bugs\n\nThe dreamcastcard->timer could schedule the spu_dma_work and the\nspu_dma_work could also arm the dreamcastcard->timer.\n\nWhen the snd_pcm_substream is closing, the aica_channel will be\ndeallocated. But it could still be dereferenced in the worker\nthread. The reason is that del_timer() will return directly\nregardless of whether the timer handler is running or not and\nthe worker could be rescheduled in the timer handler. As a result,\nthe UAF bug will happen. The racy situation is shown below:\n\n (Thread 1) | (Thread 2)\nsnd_aicapcm_pcm_close() |\n ... | run_spu_dma() //worker\n | mod_timer()\n flush_work() |\n del_timer() | aica_period_elapsed() //timer\n kfree(dreamcastcard->channel) | schedule_work()\n | run_spu_dma() //worker\n ... | dreamcastcard->channel-> //USE\n\nIn order to mitigate this bug and other possible corner cases,\ncall mod_timer() conditionally in run_spu_dma(), then implement\nPCM sync_stop op to cancel both the timer and worker. The sync_stop\nop will be called from PCM core appropriately when needed." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached only through the ALSA PCM character device `/dev/snd/pcmC0D0p` via open/ioctl(PREPARE,START)/close on the local system. There is no network-facing path into the Dreamcast AICA driver.\nAC:L - The attacker drives both sides of the race — arming the self-rearming timer/work pair with TRIGGER_START and then closing the substream — and the timer rearms every jiffy, so the window recurs continuously and a tight open/start/close loop wins it reliably. No condition outside the attacker's control is required.\nPR:L - Only a local unprivileged account with access to the sound device node is needed (audio group or console-user ACL); no capability, CAP_SYS_ADMIN, or root check exists anywhere on the `snd_pcm_release_substream()` → `snd_aicapcm_pcm_close()` path.\nUI:N - The attacking process performs every step itself — opening the PCM device, starting playback, and closing it — with no action from any other user.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free on a kmalloc-32 object: `startup_aica()` reads all 32 bytes of the freed `struct aica_channel` and DMAs them into SPU memory, and the freed slot can be groomed to hold attacker-selected reclaimed kernel objects, giving a path to kernel memory disclosure.\nI:H - `run_spu_dma()` performs `dreamcastcard->channel->flags |= 0x01` on freed memory — a read-modify-write into a reclaimed kmalloc-32 object the attacker can heap-spray, yielding a controlled write primitive usable for privilege escalation.\nA:H - The revived worker also dereferences `dreamcastcard->substream` after close sets it to NULL, giving a deterministic oops, and the UAF itself corrupts slab state leading to kernel panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "sound/sh/aica.c" ], "versions": [ { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "4206ad65a0ee76920041a755bd3c17c6ba59bba2", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "aa39e6878f61f50892ee2dd9d2176f72020be845", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "8c990221681688da34295d6d76cc2f5b963e83f5", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "9d66ae0e7bb78b54e1e0525456c6b54e1d132046", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "61d4787692c1fccdc268ffa7a891f9c149f50901", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "3c907bf56905de7d27b329afaf59c2fb35d17b04", "status": "affected", "versionType": "git" }, { "version": "198de43d758ca2700e2b52b49c0b189b4931466c", "lessThan": "051e0840ffa8ab25554d6b14b62c9ab9e4901457", "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/sh/aica.c" ], "versions": [ { "version": "2.6.23", "status": "affected" }, { "version": "0", "lessThan": "2.6.23", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.312", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.274", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.215", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.154", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.84", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.24", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.12", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.3", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "2.6.23", "versionEndExcluding": "4.19.312" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "5.4.274" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "5.10.215" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "5.15.154" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.1.84" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.6.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.7.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.8.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.23", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2" }, { "url": "https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2" }, { "url": "https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845" }, { "url": "https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5" }, { "url": "https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046" }, { "url": "https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901" }, { "url": "https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3" }, { "url": "https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04" }, { "url": "https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457" } ], "title": "ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:07:19.846Z" }, "title": "CVE Program Container", "references": [ { "url": 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