{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-38388", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-21T10:12:11.500Z", "datePublished": "2024-06-21T10:18:12.995Z", "dateUpdated": "2026-08-05T11:32:36.453Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:32:36.453Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: hda/cs_dsp_ctl: Use private_free for control cleanup\n\nUse the control private_free callback to free the associated data\nblock. This ensures that the memory won't leak, whatever way the\ncontrol gets destroyed.\n\nThe original implementation didn't actually remove the ALSA\ncontrols in hda_cs_dsp_control_remove(). It only freed the internal\ntracking structure. This meant it was possible to remove/unload the\namp driver while leaving its ALSA controls still present in the\nsoundcard. Obviously attempting to access them could cause segfaults\nor at least dereferencing stale pointers." } ], "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 through ioctls (SNDRV_CTL_IOCTL_ELEM_READ/WRITE/INFO) on the local ALSA control device /dev/snd/controlC*, requiring local system access. There is no network-facing component in sound/pci/hda/hda_cs_dsp_ctl.c.\nAC:L - Once the amp driver is unbound the dangling kcontrol persists indefinitely on the sound card, so there is no race to win — the attacker freely grooms the kmalloc-32/kmalloc-192 slabs to reclaim the freed hda_cs_dsp_coeff_ctl and cs_dsp_coeff_ctl, then triggers the dereference at a time of their choosing, repeatably. Cirrus CS35L41/CS35L56 amps are present on a very large population of current laptops, so the affected configuration is common rather than exotic.\nPR:L - Exploitation only requires the ability to open /dev/snd/controlC* and issue element read/write ioctls, which snd_ctl_elem_read()/snd_ctl_elem_write() perform with no capability check — any local user in the audio group or with an active logind session qualifies. No root or CAP_SYS_ADMIN is needed to reach the use-after-free.\nUI:N - The attacker performs the entire exploit themselves with ioctls on the stale control; no victim needs to open a file, mount a filesystem, or otherwise interact. The driver-unbind that leaves the stale control behind is an ambient system state (module update, driver reload, codec rebind), not an action the attacker must social-engineer a victim into performing during the attack.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed. Standard kernel-local privilege escalation keeps the scope unchanged.\nC:H - After reclaiming the freed cs_dsp_coeff_ctl the attacker controls ctl->cache and ctl->len, and cs_dsp_coeff_read_ctrl() does memcpy(buf, ctl->cache + off*4, len) into the control value buffer, which snd_ctl_ioctl_elem_read() copies straight to userspace — an arbitrary kernel memory read primitive.\nI:H - cs_dsp_coeff_write_ctrl() does memcpy(ctl->cache + off*4, buf, len) with an attacker-controlled destination pointer and attacker-supplied data, giving an arbitrary kernel write; additionally the stale kcontrol's get/put/info function pointers reference the unloaded snd-hda-cs-dsp-ctls module text, allowing indirect control-flow hijack into freed executable memory.\nA:H - Even without successful heap grooming, dereferencing the freed hda_cs_dsp_coeff_ctl and cs_dsp_coeff_ctl, taking a mutex on freed memory, and calling into unloaded module text reliably produces an oops or panic. Any unprivileged user with audio access can crash the machine on demand." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "sound/pci/hda/hda_cs_dsp_ctl.c" ], "versions": [ { "version": "3233b978af23f11b4ad4f7f11a9a64bd05702b1f", "lessThan": "191dc1b2ff0fb35e7aff15a53224837637df8bff", "status": "affected", "versionType": "git" }, { "version": "3233b978af23f11b4ad4f7f11a9a64bd05702b1f", "lessThan": "6e359be4975006ff72818e79dad8fe48293f2eb2", "status": "affected", "versionType": "git" }, { "version": "3233b978af23f11b4ad4f7f11a9a64bd05702b1f", "lessThan": "3291486af5636540980ea55bae985f3eaa5b0740", "status": "affected", "versionType": "git" }, { "version": "3233b978af23f11b4ad4f7f11a9a64bd05702b1f", "lessThan": "172811e3a557d8681a5e2d0f871dc04a2d17eb13", "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/pci/hda/hda_cs_dsp_ctl.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.93", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.33", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.4", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "6.0", "versionEndExcluding": "6.1.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.9.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/191dc1b2ff0fb35e7aff15a53224837637df8bff" }, { "url": "https://git.kernel.org/stable/c/6e359be4975006ff72818e79dad8fe48293f2eb2" }, { "url": "https://git.kernel.org/stable/c/3291486af5636540980ea55bae985f3eaa5b0740" }, { "url": "https://git.kernel.org/stable/c/172811e3a557d8681a5e2d0f871dc04a2d17eb13" } ], "title": "ALSA: hda/cs_dsp_ctl: Use private_free for control cleanup", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 3.3, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-24T15:21:00.338175Z", "id": "CVE-2024-38388", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-06T16:48:24.756Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:04:25.255Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/191dc1b2ff0fb35e7aff15a53224837637df8bff", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6e359be4975006ff72818e79dad8fe48293f2eb2", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/3291486af5636540980ea55bae985f3eaa5b0740", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/172811e3a557d8681a5e2d0f871dc04a2d17eb13", "tags": [ "x_transferred" ] } ] } ] } }