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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregmap: slimbus: fix bus_context pointer in regmap init calls\n\nCommit 4e65bda8273c (\"ASoC: wcd934x: fix error handling in\nwcd934x_codec_parse_data()\") revealed the problem in the slimbus regmap.\nThat commit breaks audio playback, for instance, on sdm845 Thundercomm\nDragonboard 845c board:\n\n Unable to handle kernel paging request at virtual address ffff8000847cbad4\n ...\n CPU: 5 UID: 0 PID: 776 Comm: aplay Not tainted 6.18.0-rc1-00028-g7ea30958b305 #11 PREEMPT\n Hardware name: Thundercomm Dragonboard 845c (DT)\n ...\n Call trace:\n  slim_xfer_msg+0x24/0x1ac [slimbus] (P)\n  slim_read+0x48/0x74 [slimbus]\n  regmap_slimbus_read+0x18/0x24 [regmap_slimbus]\n  _regmap_raw_read+0xe8/0x174\n  _regmap_bus_read+0x44/0x80\n  _regmap_read+0x60/0xd8\n  _regmap_update_bits+0xf4/0x140\n  _regmap_select_page+0xa8/0x124\n  _regmap_raw_write_impl+0x3b8/0x65c\n  _regmap_bus_raw_write+0x60/0x80\n  _regmap_write+0x58/0xc0\n  regmap_write+0x4c/0x80\n  wcd934x_hw_params+0x494/0x8b8 [snd_soc_wcd934x]\n  snd_soc_dai_hw_params+0x3c/0x7c [snd_soc_core]\n  __soc_pcm_hw_params+0x22c/0x634 [snd_soc_core]\n  dpcm_be_dai_hw_params+0x1d4/0x38c [snd_soc_core]\n  dpcm_fe_dai_hw_params+0x9c/0x17c [snd_soc_core]\n  snd_pcm_hw_params+0x124/0x464 [snd_pcm]\n  snd_pcm_common_ioctl+0x110c/0x1820 [snd_pcm]\n  snd_pcm_ioctl+0x34/0x4c [snd_pcm]\n  __arm64_sys_ioctl+0xac/0x104\n  invoke_syscall+0x48/0x104\n  el0_svc_common.constprop.0+0x40/0xe0\n  do_el0_svc+0x1c/0x28\n  el0_svc+0x34/0xec\n  el0t_64_sync_handler+0xa0/0xf0\n  el0t_64_sync+0x198/0x19c\n\nThe __devm_regmap_init_slimbus() started to be used instead of\n__regmap_init_slimbus() after the commit mentioned above and turns out\nthe incorrect bus_context pointer (3rd argument) was used in\n__devm_regmap_init_slimbus(). It should be just \"slimbus\" (which is equal\nto \u0026slimbus-\u003edev). Correct it. The wcd934x codec seems to be the only or\nthe first user of devm_regmap_init_slimbus() but we should fix it till\nthe point where __devm_regmap_init_slimbus() was introduced therefore\ntwo \"Fixes\" tags.\n\nWhile at this, also correct the same argument in __regmap_init_slimbus()."
        }
      ],
      "metrics": [
        {
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "value": "AV:L - The vulnerable code is reached from userspace through the ALSA PCM ioctl path (SNDRV_PCM_IOCTL_HW_PARAMS on /dev/snd/pcmC*D*) leading to wcd934x_hw_params() \u2192 regmap_write(wcd-\u003eif_regmap), as shown in the commit\u0027s own oops trace. SLIMbus is an on-SoC bus with no network or adjacent-network exposure, so exploitation requires local access to the audio device node.\nAC:L - The bus_context pointer is unconditionally wrong for every regmap created via devm_regmap_init_slimbus(), so any hw_params call on an affected sdm845/WCD934x device reliably dereferences the stale stack address \u2014 no race, no timing window, no unpredictable precondition. The driver is enabled by default in arm64 defconfig, and the attacker fully controls when and how often the trigger fires by repeatedly configuring PCM streams.\nPR:L - An unprivileged local user only needs access to the ALSA PCM character device, which is granted by default on the affected platforms (logind/udev ACLs for the seat user on Linux distributions, the audio group on postmarketOS/Debian on Yoga C630, and the audio UID on Android). No CAP_SYS_ADMIN or root is required to open /dev/snd and issue hw_params.\nUI:N - The attacker triggers the fault entirely with their own ioctl sequence on the PCM device; no action by any other user, no file to open, and no filesystem to mount is needed.\nS:U - The dangling pointer dereference and any resulting corruption occur within the kernel\u0027s own security authority on the same host, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - This is effectively a use-after-free of a VMAP kernel stack combined with type confusion: slim_xfer_msg() interprets freed/recycled stack bytes as a struct slim_device and follows sbdev-\u003ectrl, then reads through ctrl-\u003edev, ctrl-\u003esched, and ctrl-\u003etid_idr, allowing an attacker who grooms the reclaimed stack to redirect reads to arbitrary kernel addresses and disclose their contents.\nI:H - The type-confused controller pointer is used for writes \u2014 idr_alloc_cyclic() on ctrl-\u003etid_idr, spin_lock_irqsave() on ctrl-\u003etxn_lock, and pm_runtime refcount updates on ctrl-\u003edev \u2014 and culminates in the indirect call ctrl-\u003exfer_msg(ctrl, txn) through a function pointer read from attacker-groomable freed stack memory, giving control-flow hijack and privilege escalation potential.\nA:H - The commit documents a reproducible kernel paging-request fault (\"Unable to handle kernel paging request at virtual address ffff8000847cbad4\") on every audio playback attempt, and the same stale pointer is also dereferenced from wcd934x_slim_irq_handler() in interrupt context, so an unprivileged user can deterministically oops the kernel and deny service."
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        {
          "url": "https://git.kernel.org/stable/c/434f7349a1f00618a620b316f091bd13a12bc8d2"
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      "title": "regmap: slimbus: fix bus_context pointer in regmap init calls",
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  "cveMetadata": {
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    "cveId": "CVE-2025-40317",
    "datePublished": "2025-12-08T00:46:44.287Z",
    "dateReserved": "2025-04-16T07:20:57.186Z",
    "dateUpdated": "2026-08-05T12:09:27.968Z",
    "state": "PUBLISHED"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once\n\nhci_cmd_sync_dequeue_once() does lookup and then cancel\nthe entry under two separate lock sections. Meanwhile,\nhci_cmd_sync_work() can also delete the same entry,\nleading to double list_del() and \"UAF\".\n\nFix this by holding cmd_sync_work_lock across both\nlookup and cancel, so that the entry cannot be removed\nconcurrently."
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              "value": "AV:A - The flaw is in the Bluetooth HCI command-sync queue, and the create-connection entries it manages are queued and aborted in response to LE/ACL link events from a peer in radio range (advertising reports driving `check_pending_le_conn()`, and `le_conn_timeout` when the peer stops responding). An attacker within Bluetooth range can drive both the queue and cancel sides without any local access.\nAC:L - The attacker controls both sides of the race \u2014 repeatedly forcing connection attempts and aborts cycles `hci_cancel_connect_sync()` against the `cmd_sync_work` kthread draining the same list entry, and the attempt can be retried without limit. The window sits between two lock acquisitions in the same function with the worker on a separate CPU, making it readily hit on SMP.\nPR:N - The adjacent attacker holds no credentials on the target: the LE create-connection queue/cancel cycle happens entirely before pairing or authentication completes. Even on the purely local path only an unprivileged AF_BLUETOOTH socket is needed, since `l2cap_sock_create()` gates only SOCK_RAW behind CAP_NET_RAW.\nUI:N - Background LE auto-connect and connection-timeout handling proceed autonomously in kernel workqueues with no victim action. No file must be opened, device mounted, or prompt accepted.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed. Impact is standard in-kernel compromise.\nC:H - The use-after-free reads `entry-\u003edestroy` and `entry-\u003edata` out of a freed kmalloc-64 object and dereferences them, and the resulting hijacked call plus double-`list_del` write primitive can be leveraged into arbitrary kernel memory disclosure. Freed-slab reads alone already expose adjacent kernel heap contents.\nI:H - `_hci_cmd_sync_cancel_entry()` calls a function pointer read from freed memory and then performs a double `list_del()` that writes attacker-groomable pointers to attacker-groomable addresses, plus a double `kfree()`. That combination is a direct control-flow-hijack and arbitrary-write path to full kernel code execution.\nA:H - Without successful grooming the same code path dereferences LIST_POISON or freed slab contents, producing a `list_del corruption` BUG, GPF, or panic. The double free additionally corrupts the slab allocator, crashing the system."
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          "url": "https://git.kernel.org/stable/c/932c0a4f77ac13e526fdd5b42914d29c9821d389"
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          "url": "https://git.kernel.org/stable/c/09b0cd1297b4dbfe736aeaa0ceeab2265f47f772"
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      "title": "Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40318",
    "datePublished": "2025-12-08T00:46:45.382Z",
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              "value": "AV:L - The vulnerability is reached through the `bpf()` syscall \u2014 creating a ringbuf map, loading a program that calls `bpf_ringbuf_output`/`submit`, and closing the fds to drive `ringbuf_map_free()`. There is no path for a remote peer to load BPF programs, so local system access is required.\nAC:L - The attacker controls both sides of the race: he triggers `bpf_ringbuf_commit()` on demand (loopback packet into his own socket filter, using `BPF_RB_FORCE_WAKEUP` to guarantee `irq_work_queue()` on every commit) and separately triggers the free by detaching and closing the map/prog fds, looping unboundedly. On PREEMPT_RT the work is deferred to the `irq_workd` kthread and on architectures without `arch_irq_work_has_interrupt()` to the next tick, widening the window to milliseconds; syzbot both reproduced the bug and confirmed the fix.\nPR:L - `BPF_MAP_TYPE_RINGBUF`/`USER_RINGBUF` are listed as unprivileged map types in `map_create()`, the ringbuf helpers sit above the `CAP_BPF` gate in `bpf_base_func_proto()`, `BPF_PROG_TYPE_SOCKET_FILTER` is exempt from the CAP_BPF prog-load check, and `SO_ATTACH_BPF` has no capability check \u2014 so an ordinary unprivileged user can build the entire chain on the upstream default `unprivileged_bpf_disabled=0`.\nUI:N - The attacker performs every step himself \u2014 map creation, program load, socket attach, packet injection, and fd close \u2014 with no victim action or cooperating process required.\nS:U - The use-after-free corrupts kernel memory and the per-CPU irq_work list within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `irq_work_single()` and `bpf_ringbuf_notify()`/`wake_up_all()` read `work-\u003enode.llist`, `work-\u003efunc`, `work-\u003eirqwait.task`, and the `waitq` list head out of freed memory, and the vmalloc VA range can be reclaimed with a large vmalloc-backed `BPF_MAP_TYPE_ARRAY` whose contents the attacker sets \u2014 turning the dangling traversal into an arbitrary kernel-memory read/disclosure primitive.\nI:H - The irq_work core performs `atomic_set()`/`atomic_cmpxchg()` writes into the freed object and an indirect call `work-\u003efunc(work)` on a pointer read from it, while `wake_up_all()` adds `list_del_init()` unlink writes and a second function-pointer call \u2014 after VA-range reclamation with controlled data this is a direct control-flow hijack and arbitrary-write path to privilege escalation.\nA:H - This is a use-after-free reported by syzbot as a KASAN splat; in the common case the irq_work dereferences an already-unmapped vmalloc address from hardirq or the `irq_workd` kthread, producing an unhandled page fault and kernel panic, and it can be re-triggered in a loop."
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