{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72304", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.918Z", "datePublished": "2026-08-15T05:55:22.290Z", "dateUpdated": "2026-08-17T05:42:37.543Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:42:37.543Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SOF: ipc4-control: Fix TOCTOU in sof_ipc4_bytes_put\n\nIn sof_ipc4_bytes_put(), the copy size is derived from the old\ndata->size in the buffer rather than the incoming new data's size\nfield from ucontrol. If the new data has a different size, the copy\nuses the wrong length: it may truncate valid data or copy stale bytes.\n\nFix by validating and using the incoming data's sof_abi_hdr.size from\nucontrol before copying." } ], "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 bug is reached via SNDRV_CTL_IOCTL_ELEM_WRITE on /dev/snd/controlC* through snd_ctl_elem_write_user() -> snd_sof_bytes_put() -> sof_ipc4_bytes_put(); SOF IPC4 bytes controls are a local ALSA ioctl path, not a network-facing service.\nAC:L - An attacker reliably triggers the flaw with two self-controlled ALSA writes: first establish a small cached data->size, then submit a ucontrol whose sof_abi_hdr.size differs; no race against unrelated victim state is required.\nPR:L - Only a local user who can open ALSA control devices on SOF-equipped Intel laptop/desktop audio hardware is required; typical desktop users in the audio group have this access without real root or init-namespace capabilities.\nUI:N - No separate victim action is needed; the attacker issues the control-element write ioctls directly to drive the vulnerable copy and subsequent IPC transmission.\nS:U - Impact is confined to the host kernel SOF/ALSA audio subsystem on the same machine; heap disclosure, IPC misuse, or firmware parameter corruption does not cross VM, container, or IOMMU boundaries.\nC:H - Validating and copying against stale data->size lets attacker-controlled new_hdr->size bypass bounds checks, so sof_ipc4_set_get_bytes_data() and IPC helpers read beyond the kmalloc control buffer, disclosing adjacent kernel heap memory.\nI:H - The mismatched copy leaves attacker-influenced stale kernel bytes in control buffers and forwards unvalidated sizes to firmware IPC (including sof_ipc4_set_bytes_control_data() memcpy paths), enabling bounded but attacker-directed kernel memory corruption.\nA:H - Inflated unvalidated data->size values drive large memcpy/IPC loops past the allocated control payload, which can provoke KASAN faults, unhandled page faults, kernel oops, or panic on SOF systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "sound/soc/sof/ipc4-control.c" ], "versions": [ { "version": "a062c8899fede2ab5660a817e9b602d3fa280a99", "lessThan": "266f936db83aee6ca6473bbb06259bda52bf4fc3", "status": "affected", "versionType": "git" }, { "version": "a062c8899fede2ab5660a817e9b602d3fa280a99", "lessThan": "4cf6a7ebbf8787393b158b2cc341723e5bebc4a8", "status": "affected", "versionType": "git" }, { "version": "a062c8899fede2ab5660a817e9b602d3fa280a99", "lessThan": "fb4293173db2d474d8fbc0e5ecf4943e6df2b40e", "status": "affected", "versionType": "git" }, { "version": "a062c8899fede2ab5660a817e9b602d3fa280a99", "lessThan": "038406abde0d0883419ec89425ea941ec8bbef95", "status": "affected", "versionType": "git" }, { "version": "a062c8899fede2ab5660a817e9b602d3fa280a99", "lessThan": "3ad673e7139cf214afd24321a829aad6575f4163", "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/soc/sof/ipc4-control.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.4", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/266f936db83aee6ca6473bbb06259bda52bf4fc3" }, { "url": "https://git.kernel.org/stable/c/4cf6a7ebbf8787393b158b2cc341723e5bebc4a8" }, { "url": "https://git.kernel.org/stable/c/fb4293173db2d474d8fbc0e5ecf4943e6df2b40e" }, { "url": "https://git.kernel.org/stable/c/038406abde0d0883419ec89425ea941ec8bbef95" }, { "url": "https://git.kernel.org/stable/c/3ad673e7139cf214afd24321a829aad6575f4163" } ], "title": "ASoC: SOF: ipc4-control: Fix TOCTOU in sof_ipc4_bytes_put", "x_generator": { "engine": "bippy-1.2.0" } } } }