CVE-2025-38485 (GCVE-0-2025-38485)
Vulnerability from cvelistv5
Published
2025-07-28 11:21
Modified
2026-08-05 12:02
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: iio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush fxls8962af_fifo_flush() uses indio_dev->active_scan_mask (with iio_for_each_active_channel()) without making sure the indio_dev stays in buffer mode. There is a race if indio_dev exits buffer mode in the middle of the interrupt that flushes the fifo. Fix this by calling synchronize_irq() to ensure that no interrupt is currently running when disabling buffer mode. Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [...] _find_first_bit_le from fxls8962af_fifo_flush+0x17c/0x290 fxls8962af_fifo_flush from fxls8962af_interrupt+0x80/0x178 fxls8962af_interrupt from irq_thread_fn+0x1c/0x7c irq_thread_fn from irq_thread+0x110/0x1f4 irq_thread from kthread+0xe0/0xfc kthread from ret_from_fork+0x14/0x2c
References
Impacted products
Vendor Product Version
Linux Linux Version: 79e3a5bdd9efbdf4e1069793d7735b432d641e7c
Version: 79e3a5bdd9efbdf4e1069793d7735b432d641e7c
Version: 79e3a5bdd9efbdf4e1069793d7735b432d641e7c
Version: 79e3a5bdd9efbdf4e1069793d7735b432d641e7c
Version: 79e3a5bdd9efbdf4e1069793d7735b432d641e7c
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          "dateUpdated": "2025-11-03T17:38:55.102Z",
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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
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        "title": "CVE Program Container"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush\n\nfxls8962af_fifo_flush() uses indio_dev-\u003eactive_scan_mask (with\niio_for_each_active_channel()) without making sure the indio_dev\nstays in buffer mode.\nThere is a race if indio_dev exits buffer mode in the middle of the\ninterrupt that flushes the fifo. Fix this by calling\nsynchronize_irq() to ensure that no interrupt is currently running when\ndisabling buffer mode.\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000000 when read\n[...]\n_find_first_bit_le from fxls8962af_fifo_flush+0x17c/0x290\nfxls8962af_fifo_flush from fxls8962af_interrupt+0x80/0x178\nfxls8962af_interrupt from irq_thread_fn+0x1c/0x7c\nirq_thread_fn from irq_thread+0x110/0x1f4\nirq_thread from kthread+0xe0/0xfc\nkthread from ret_from_fork+0x14/0x2c"
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            "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 race is driven entirely from local userspace by toggling `/sys/bus/iio/devices/iio:deviceN/buffer/enable` and reading `/dev/iio:deviceN`; there is no network-facing path to the IIO buffer core or this accelerometer driver.\nAC:L - The attacker controls both sides \u2014 the sensor IRQ cadence via `sampling_frequency`/`hwfifo_watermark`, and the free via the buffer-disable write \u2014 and the threaded handler spends milliseconds in I2C FIFO reads inside the unprotected window, so the race is reliably hit and freely retried in a loop.\nPR:L - Only an unprivileged local account with access to the IIO sysfs/chardev nodes is required; on the Android/embedded/automotive platforms that ship FXLS8962AF/8964AF these nodes are group-owned by the sensor service, so a low-privileged process can enable and disable the hardware FIFO buffer.\nUI:N - The attacker performs every step \u2014 configure rate/watermark, enable the buffer, disable it mid-flush \u2014 with no action from any other user or administrator.\nS:U - The freed bitmap, the corrupted stack buffer and the driver private data all live in the kernel\u0027s own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Reading the freed, sprayable scan mask makes `bit` attacker-influenced, so `buffer[i * 3 + bit]` reads past the valid samples and off the end of the stack array, and those bytes are pushed via `iio_push_to_buffers_with_ts()` into the userspace-readable kfifo \u2014 a direct kernel memory disclosure on top of the use-after-free read itself.\nI:H - With a groomed kmalloc-8/16 replacement object the loop index `j` exceeds the 3-element `data-\u003escan.channels[]` array, giving an out-of-bounds write into adjacent heap-resident driver state; per use-after-free scoring this is exploitable for control over kernel data.\nA:H - The reported failure mode is a kernel NULL pointer dereference oops in `_find_first_bit_le` from `fxls8962af_fifo_flush()` in the IRQ thread, and the UAF path can be re-triggered repeatedly to crash the system."
            }
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        "dateUpdated": "2026-08-05T12:02:17.653Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6ecd61c201b27ad2760b3975437ad2b97d725b98"
        },
        {
          "url": "https://git.kernel.org/stable/c/dda42f23a8f5439eaac9521ce0531547d880cc54"
        },
        {
          "url": "https://git.kernel.org/stable/c/bfcda3e1015791b3a63fb4d3aad408da9cf76e8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/1803d372460aaa9ae0188a30c9421d3f157f2f04"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fe16dc1a2f5057772e5391ec042ed7442966c9a"
        }
      ],
      "title": "iio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38485",
    "datePublished": "2025-07-28T11:21:49.624Z",
    "dateReserved": "2025-04-16T04:51:24.021Z",
    "dateUpdated": "2026-08-05T12:02:17.653Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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