{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38486", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.021Z", "datePublished": "2025-07-28T11:21:50.349Z", "dateUpdated": "2026-08-05T12:02:18.718Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:02:18.718Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsoundwire: Revert \"soundwire: qcom: Add set_channel_map api support\"\n\nThis reverts commit 7796c97df6b1b2206681a07f3c80f6023a6593d5.\n\nThis patch broke Dragonboard 845c (sdm845). I see:\n\n Unexpected kernel BRK exception at EL1\n Internal error: BRK handler: 00000000f20003e8 [#1] SMP\n pc : qcom_swrm_set_channel_map+0x7c/0x80 [soundwire_qcom]\n lr : snd_soc_dai_set_channel_map+0x34/0x78\n Call trace:\n qcom_swrm_set_channel_map+0x7c/0x80 [soundwire_qcom] (P)\n sdm845_dai_init+0x18c/0x2e0 [snd_soc_sdm845]\n snd_soc_link_init+0x28/0x6c\n snd_soc_bind_card+0x5f4/0xb0c\n snd_soc_register_card+0x148/0x1a4\n devm_snd_soc_register_card+0x50/0xb0\n sdm845_snd_platform_probe+0x124/0x148 [snd_soc_sdm845]\n platform_probe+0x6c/0xd0\n really_probe+0xc0/0x2a4\n __driver_probe_device+0x7c/0x130\n driver_probe_device+0x40/0x118\n __device_attach_driver+0xc4/0x108\n bus_for_each_drv+0x8c/0xf0\n __device_attach+0xa4/0x198\n device_initial_probe+0x18/0x28\n bus_probe_device+0xb8/0xbc\n deferred_probe_work_func+0xac/0xfc\n process_one_work+0x244/0x658\n worker_thread+0x1b4/0x360\n kthread+0x148/0x228\n ret_from_fork+0x10/0x20\n Kernel panic - not syncing: BRK handler: Fatal exception\n\nDan has also reported following issues with the original patch\nhttps://lore.kernel.org/all/33fe8fe7-719a-405a-9ed2-d9f816ce1d57@sabinyo.mountain/\n\nBug #1:\nThe zeroeth element of ctrl->pconfig[] is supposed to be unused. We\nstart counting at 1. However this code sets ctrl->pconfig[0].ch_mask = 128.\n\nBug #2:\nThere are SLIM_MAX_TX_PORTS (16) elements in tx_ch[] array but only\nQCOM_SDW_MAX_PORTS + 1 (15) in the ctrl->pconfig[] array so it corrupts\nmemory like Yongqin Liu pointed out.\n\nBug 3:\nLike Jie Gan pointed out, it erases all the tx information with the rx\ninformation." } ], "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 `set_channel_map` op is reached only through the local ALSA PCM character device (`/dev/snd/pcmC*D*`) via the Qualcomm machine driver's `.startup` callback, or automatically during platform driver probe; there is no remote or adjacent-network path into `drivers/soundwire/qcom.c`.\nAC:L - The overflow is fully deterministic — `sdm845_dai_init()` unconditionally passes a hardcoded count of 16 into a 15-element array on every card bind, and the wrong-index writes occur on every PCM open — with no race, no memory-layout dependency, and no condition outside the attacker's control.\nPR:L - An unprivileged local account with access to the ALSA PCM nodes (the audio group on the Android/embedded/Snapdragon-laptop platforms that ship this controller) reaches `qcom_swrm_set_channel_map()` simply by opening a SoundWire-backed stream; the probe-time out-of-bounds write requires no privileges at all, so low privilege is the upper bound of what is needed.\nUI:N - The attacker's own process performs the PCM open that drives the corruption, and the probe-path out-of-bounds write and resulting panic occur automatically during boot with no action from any other user or administrator.\nS:U - The overflowed `pconfig[]` array, the clobbered `sruntime[]` pointer array and the misprogrammed SoundWire port registers all belong to the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The out-of-bounds byte lands inside the adjacent `struct sdw_stream_runtime *sruntime[]`, corrupting a kernel pointer that `qcom_swrm_hw_params()` dereferences and iterates (`stream->master_list`, `m_rt->bus->id`, per-port `ch_mask`), turning the write into a wild-pointer read of arbitrary kernel memory whose values are then programmed into device registers.\nI:H - `qcom_swrm_set_channel_map()` performs an unbounded out-of-bounds write past `ctrl->pconfig[]` into adjacent driver state, and additionally writes attacker-influenced channel masks into the wrong port slots which `qcom_swrm_port_enable()` commits straight to the SoundWire hardware control registers.\nA:H - The reported and reproducible outcome is a fatal kernel panic (\"Unexpected kernel BRK exception at EL1 ... Kernel panic - not syncing\") in `qcom_swrm_set_channel_map()` during probe, leaving affected Qualcomm boards unbootable; the corrupted `sruntime` pointer additionally oopses when dereferenced during stream setup." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/soundwire/qcom.c" ], "versions": [ { "version": "7796c97df6b1b2206681a07f3c80f6023a6593d5", "lessThan": "207cea8b72fcbdf4e6db178e54186ed4f1514b3c", "status": "affected", "versionType": "git" }, { "version": "7796c97df6b1b2206681a07f3c80f6023a6593d5", "lessThan": "834bce6a715ae9a9c4dce7892454a19adf22b013", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/soundwire/qcom.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.8", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "6.15", "versionEndExcluding": "6.15.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/207cea8b72fcbdf4e6db178e54186ed4f1514b3c" }, { "url": "https://git.kernel.org/stable/c/834bce6a715ae9a9c4dce7892454a19adf22b013" } ], "title": "soundwire: Revert \"soundwire: qcom: Add set_channel_map api support\"", "x_generator": { "engine": "bippy-1.2.0" } } } }