138 lines
8.3 KiB
JSON
138 lines
8.3 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-39935",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.148Z",
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"datePublished": "2025-10-04T07:30:59.102Z",
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"dateUpdated": "2026-08-05T12:06:13.802Z"
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},
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:06:13.802Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded()\n\nThe sma1307->set.header_size is how many integers are in the header\n(there are 8 of them) but instead of allocating space of 8 integers\nwe allocate 8 bytes. This leads to memory corruption when we copy data\nit on the next line:\n\n memcpy(sma1307->set.header, data,\n sma1307->set.header_size * sizeof(int));\n\nAlso since we're immediately copying over the memory in ->set.header,\nthere is no need to zero it in the allocator. Use devm_kmalloc_array()\nto allocate the memory instead."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable code is reached through a local ALSA mixer control write (`SNDRV_CTL_IOCTL_ELEM_WRITE` on `/dev/snd/controlC*` → `sma1307_reset_put()` → `sma1307_reset()` → `sma1307_setting_loaded()`), or at driver probe on an I2C-attached codec. There is no network or adjacent-network reachability.\nAC:L - The mismatch is unconditional — `devm_kzalloc(dev, 8)` followed by a 32-byte `memcpy` overflows on every single settings load, with no race, no timing window, and no memory-layout precondition. The attacker can re-trigger it arbitrarily many times via the \"Reset Switch\" control, and the accompanying devres leak provides repeatable heap grooming.\nPR:L - Triggering requires only write access to the sound control device (`root:audio 0660`, plus logind ACL for the active session user; the audio server on Android) — an ordinary unprivileged local account, with no capability check anywhere along `snd_ctl_elem_write()` → `sma1307_reset_put()`.\nUI:N - The attacker writes the mixer control directly from their own process; no victim action, no file open, and no administrator step is needed. The probe-time path also fires automatically at boot.\nS:U - The out-of-bounds write corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The `memcpy` reads 32 bytes from a `kzalloc(fw->size)` buffer that may be as small as 8 bytes, disclosing up to 24 bytes of adjacent kernel heap into `set.header` (readable back through the driver's binary/register paths). More broadly, an adjacent-slab-object overwrite of SLUB freelist metadata is a well-established route to an arbitrary kernel read primitive.\nI:H - This is a 24-byte heap buffer overflow that writes past the `kmalloc-64` devres object into the neighbouring slab allocation, corrupting whatever kernel object or SLUB freelist pointer sits there. Combined with the repeatable-allocation grooming primitive, this is exploitable for controlled memory corruption and privilege escalation, especially where the firmware file content is attacker-influenceable.\nA:H - Slab corruption of an adjacent object reliably produces oopses/panics (immediate KASAN slab-out-of-bounds report on instrumented kernels), and each \"Reset Switch\" write additionally leaks devres allocations for `header`, `def`, and all `mode_set[]` entries without freeing the previous ones, allowing an unprivileged user to exhaust kernel memory."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"sound/soc/codecs/sma1307.c"
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],
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"versions": [
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{
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"version": "576c57e6b4c1d734bcb7cc33dde9a99a9383b520",
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"lessThan": "cd59ca8f75dbb42a67fcae975c766114644e36c4",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"sound/soc/codecs/sma1307.c"
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],
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"versions": [
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{
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"version": "6.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.16.9",
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"lessThanOrEqual": "6.16.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"versionStartIncluding": "6.13",
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"versionEndExcluding": "6.16.9"
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},
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{
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"vulnerable": true,
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/cd59ca8f75dbb42a67fcae975c766114644e36c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/78338108b5a856dc98223a335f147846a8a18c51"
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}
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],
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"title": "ASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded()",
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