FKIE_CVE-2025-71274

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-05-12 21:25
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: rpmsg: core: fix race in driver_override_show() and use core helper The driver_override_show function reads the driver_override string without holding the device_lock. However, the store function modifies and frees the string while holding the device_lock. This creates a race condition where the string can be freed by the store function while being read by the show function, leading to a use-after-free. To fix this, replace the rpmsg_string_attr macro with explicit show and store functions. The new driver_override_store uses the standard driver_set_override helper. Since the introduction of driver_set_override, the comments in include/linux/rpmsg.h have stated that this helper must be used to set or clear driver_override, but the implementation was not updated until now. Because driver_set_override modifies and frees the string while holding the device_lock, the new driver_override_show now correctly holds the device_lock during the read operation to prevent the race. Additionally, since rpmsg_string_attr has only ever been used for driver_override, removing the macro simplifies the code.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e4a70f3c30910427e5ea848b799066d67b963d5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/392c6b68334aa0e0ae9aba95c0a366bcb0d92f5dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/42023d4b6d2661a40ee2dcf7e1a3528a35c638caPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47615557447185917afa432b7958f87583c417cbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7654e6e3cd6bdee9602f6063b3c670bd556d7e61Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90c8353f471821d7ccd4fe573a2402e056192494Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/954557957177c3c13d7c655976665b1170da5e50Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d66b8074c555e8abb0ae19eea1c9f3635498bddePatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrpmsg: core: fix race in driver_override_show() and use core helper\n\nThe driver_override_show function reads the driver_override string\nwithout holding the device_lock. However, the store function modifies\nand frees the string while holding the device_lock. This creates a race\ncondition where the string can be freed by the store function while\nbeing read by the show function, leading to a use-after-free.\n\nTo fix this, replace the rpmsg_string_attr macro with explicit show and\nstore functions. The new driver_override_store uses the standard\ndriver_set_override helper. Since the introduction of\ndriver_set_override, the comments in include/linux/rpmsg.h have stated\nthat this helper must be used to set or clear driver_override, but the\nimplementation was not updated until now.\n\nBecause driver_set_override modifies and frees the string while holding\nthe device_lock, the new driver_override_show now correctly holds the\ndevice_lock during the read operation to prevent the race.\n\nAdditionally, since rpmsg_string_attr has only ever been used for\ndriver_override, removing the macro simplifies the code."
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  "lastModified": "2026-05-12T21:25:11.597",
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          "confidentialityImpact": "NONE",
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