CVE-2024-26654 (GCVE-0-2024-26654)
Vulnerability from cvelistv5 – Published: 2024-04-01 08:35 – Updated: 2026-08-05 11:26
VLAI
EPSS
VEX
Title
ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs
Summary
In the Linux kernel, the following vulnerability has been resolved:
ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs
The dreamcastcard->timer could schedule the spu_dma_work and the
spu_dma_work could also arm the dreamcastcard->timer.
When the snd_pcm_substream is closing, the aica_channel will be
deallocated. But it could still be dereferenced in the worker
thread. The reason is that del_timer() will return directly
regardless of whether the timer handler is running or not and
the worker could be rescheduled in the timer handler. As a result,
the UAF bug will happen. The racy situation is shown below:
(Thread 1) | (Thread 2)
snd_aicapcm_pcm_close() |
... | run_spu_dma() //worker
| mod_timer()
flush_work() |
del_timer() | aica_period_elapsed() //timer
kfree(dreamcastcard->channel) | schedule_work()
| run_spu_dma() //worker
... | dreamcastcard->channel-> //USE
In order to mitigate this bug and other possible corner cases,
call mod_timer() conditionally in run_spu_dma(), then implement
PCM sync_stop op to cancel both the timer and worker. The sync_stop
op will be called from PCM core appropriately when needed.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:53 UTC
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
198de43d758ca2700e2b52b49c0b189b4931466c , < eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2
(git)
Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < 4206ad65a0ee76920041a755bd3c17c6ba59bba2 (git) Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < aa39e6878f61f50892ee2dd9d2176f72020be845 (git) Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < 8c990221681688da34295d6d76cc2f5b963e83f5 (git) Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < 9d66ae0e7bb78b54e1e0525456c6b54e1d132046 (git) Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < 61d4787692c1fccdc268ffa7a891f9c149f50901 (git) Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3 (git) Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < 3c907bf56905de7d27b329afaf59c2fb35d17b04 (git) Affected: 198de43d758ca2700e2b52b49c0b189b4931466c , < 051e0840ffa8ab25554d6b14b62c9ab9e4901457 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.23
Unaffected: 0 , < 2.6.23 (semver) Unaffected: 4.19.312 , ≤ 4.19.* (semver) Unaffected: 5.4.274 , ≤ 5.4.* (semver) Unaffected: 5.10.215 , ≤ 5.10.* (semver) Unaffected: 5.15.154 , ≤ 5.15.* (semver) Unaffected: 6.1.84 , ≤ 6.1.* (semver) Unaffected: 6.6.24 , ≤ 6.6.* (semver) Unaffected: 6.7.12 , ≤ 6.7.* (semver) Unaffected: 6.8.3 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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"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-\u003etimer could schedule the spu_dma_work and the\nspu_dma_work could also arm the dreamcastcard-\u003etimer.\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-\u003echannel) | schedule_work()\n | run_spu_dma() //worker\n ... | dreamcastcard-\u003echannel-\u003e //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."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: sh: aica: reordenar operaciones de limpieza para evitar errores UAF. El dreamcastcard-\u0026gt;timer podr\u00eda programar el spu_dma_work y el spu_dma_work tambi\u00e9n podr\u00eda armar el dreamcastcard-\u0026gt;timer. Cuando se cierre snd_pcm_substream, se desasignar\u00e1 aica_channel. Pero a\u00fan se podr\u00eda eliminar la referencia en el hilo del trabajador. La raz\u00f3n es que del_timer() regresar\u00e1 directamente independientemente de si el controlador del temporizador se est\u00e1 ejecutando o no y el trabajador podr\u00eda reprogramarse en el controlador del temporizador. Como resultado, se producir\u00e1 el error UAF. La situaci\u00f3n picante se muestra a continuaci\u00f3n: (Thread 1) | (Thread 2) snd_aicapcm_pcm_close() | ... | run_spu_dma() //worker | mod_timer() flush_work() | del_timer() | aica_period_elapsed() //timer kfree(dreamcastcard-\u0026gt;channel) | schedule_work() | run_spu_dma() //worker ... | dreamcastcard-\u0026gt;channel-\u0026gt; //USE Para mitigar este error y otros posibles casos extremos, llame a mod_timer() condicionalmente en run_spu_dma(), luego implemente la operaci\u00f3n PCM sync_stop para cancelar tanto el temporizador como el trabajador. La operaci\u00f3n sync_stop se llamar\u00e1 desde el n\u00facleo PCM de forma adecuada cuando sea necesario."
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"url": "https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457"
},
{
"tags": [
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-26654",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:53:59.432754Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-09-11T12:42:18.261Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"sound/sh/aica.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2",
"status": "affected",
"version": "198de43d758ca2700e2b52b49c0b189b4931466c",
"versionType": "git"
},
{
"lessThan": "4206ad65a0ee76920041a755bd3c17c6ba59bba2",
"status": "affected",
"version": "198de43d758ca2700e2b52b49c0b189b4931466c",
"versionType": "git"
},
{
"lessThan": "aa39e6878f61f50892ee2dd9d2176f72020be845",
"status": "affected",
"version": "198de43d758ca2700e2b52b49c0b189b4931466c",
"versionType": "git"
},
{
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"status": "affected",
"version": "198de43d758ca2700e2b52b49c0b189b4931466c",
"versionType": "git"
},
{
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"status": "affected",
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},
{
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{
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"version": "198de43d758ca2700e2b52b49c0b189b4931466c",
"versionType": "git"
},
{
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{
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},
{
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.23"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "4.19.312",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.274",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.215",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.154",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.84",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.24",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.7.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"version": "6.8.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
{
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],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003etimer could schedule the spu_dma_work and the\nspu_dma_work could also arm the dreamcastcard-\u003etimer.\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-\u003echannel) | schedule_work()\n | run_spu_dma() //worker\n ... | dreamcastcard-\u003echannel-\u003e //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": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"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 \u2014 arming the self-rearming timer/work pair with TRIGGER_START and then closing the substream \u2014 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\u0027s 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()` \u2192 `snd_aicapcm_pcm_close()` path.\nUI:N - The attacking process performs every step itself \u2014 opening the PCM device, starting playback, and closing it \u2014 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-\u003echannel-\u003eflags |= 0x01` on freed memory \u2014 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-\u003esubstream` after close sets it to NULL, giving a deterministic oops, and the UAF itself corrupts slab state leading to kernel panic."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:26:33.368Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-26654",
"datePublished": "2024-04-01T08:35:19.763Z",
"dateReserved": "2024-02-19T14:20:24.144Z",
"dateUpdated": "2026-08-05T11:26:33.368Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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