FKIE_CVE-2026-45914

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "hwmon: (ibmpex) fix use-after-free in high/low store" This reverts commit 6946c726c3f4c36f0f049e6f97e88c510b15f65d. Jean Delvare points out that the patch does not completely fix the reported problem, that it in fact introduces a (new) race condition, and that it may actually not be needed in the first place. Various AI reviews agree. Specific and relevant AI feedback: " This reordering sets the driver data to NULL before removing the sensor attributes in the loop below. ibmpex_show_sensor() retrieves this driver data via dev_get_drvdata() but does not check if it is NULL before dereferencing it to access data->sensors[]. If a userspace process reads a sensor file (like temp1_input) while this delete function is running, could it race with the dev_set_drvdata(..., NULL) call here and crash in ibmpex_show_sensor()? Would it be safer to keep the original order where device_remove_file() is called before clearing the driver data? device_remove_file() should wait for any active sysfs callbacks to complete, which might already prevent the use-after-free this patch intends to fix. " Revert the offending patch. If it can be shown that the originally reported alleged race condition does indeed exist, it can always be re-introduced with a complete fix.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/05112ba67c824ab416cd54307c0b50aba9f0047a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/14a38784e09aebc21207dc32fffa05247fc3dd64
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/894d9c7aab68fd0c70c78b1d03c8fa589fb0f67d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8bde3e395a85017f12af2b0ba5c3684f5af9c006
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/914b47c9b824d3d74f31c764163edf93302100b1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/efd68429f23fb4015b0ebc2392334059e06fad18
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f448acd86835a650f9ea83460b9ca347d3aafba5
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"hwmon: (ibmpex) fix use-after-free in high/low store\"\n\nThis reverts commit 6946c726c3f4c36f0f049e6f97e88c510b15f65d.\n\nJean Delvare points out that the patch does not completely\nfix the reported problem, that it in fact introduces a\n(new) race condition, and that it may actually not be needed in\nthe first place.\n\nVarious AI reviews agree. Specific and relevant AI feedback:\n\n\"\nThis reordering sets the driver data to NULL before removing the sensor\nattributes in the loop below.\n\nibmpex_show_sensor() retrieves this driver data via dev_get_drvdata() but\ndoes not check if it is NULL before dereferencing it to access\ndata-\u003esensors[].\n\nIf a userspace process reads a sensor file (like temp1_input) while this\ndelete function is running, could it race with the dev_set_drvdata(...,\nNULL) call here and crash in ibmpex_show_sensor()?\n\nWould it be safer to keep the original order where device_remove_file() is\ncalled before clearing the driver data? device_remove_file() should wait\nfor any active sysfs callbacks to complete, which might already prevent the\nuse-after-free this patch intends to fix.\n\"\n\nRevert the offending patch. If it can be shown that the originally reported\nalleged race condition does indeed exist, it can always be re-introduced\nwith a complete fix."
    }
  ],
  "id": "CVE-2026-45914",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:06.180",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/05112ba67c824ab416cd54307c0b50aba9f0047a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/14a38784e09aebc21207dc32fffa05247fc3dd64"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/894d9c7aab68fd0c70c78b1d03c8fa589fb0f67d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8bde3e395a85017f12af2b0ba5c3684f5af9c006"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/914b47c9b824d3d74f31c764163edf93302100b1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/efd68429f23fb4015b0ebc2392334059e06fad18"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f448acd86835a650f9ea83460b9ca347d3aafba5"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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