{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39935","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.148Z","datePublished":"2025-10-04T07:30:59.102Z","dateUpdated":"2026-08-05T12:06:13.802Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:06:13.802Z"},"descriptions":[{"lang":"en","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."}],"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 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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/codecs/sma1307.c"],"versions":[{"version":"576c57e6b4c1d734bcb7cc33dde9a99a9383b520","lessThan":"cd59ca8f75dbb42a67fcae975c766114644e36c4","status":"affected","versionType":"git"},{"version":"576c57e6b4c1d734bcb7cc33dde9a99a9383b520","lessThan":"78338108b5a856dc98223a335f147846a8a18c51","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/codecs/sma1307.c"],"versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"6.16.9","lessThanOrEqual":"6.16.*","status":"unaffected","versionType":"semver"},{"version":"6.17","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":"6.13","versionEndExcluding":"6.16.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.17"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/cd59ca8f75dbb42a67fcae975c766114644e36c4"},{"url":"https://git.kernel.org/stable/c/78338108b5a856dc98223a335f147846a8a18c51"}],"title":"ASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded()","x_generator":{"engine":"bippy-1.2.0"}}}}