CVE-2025-71274 (GCVE-0-2025-71274)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-10-19 18:25
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: 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
Impacted products
Vendor Product Version
Linux Linux Version: 39e47767ec9b22f844c2a07c9d329256960d4021
Version: 39e47767ec9b22f844c2a07c9d329256960d4021
Version: 39e47767ec9b22f844c2a07c9d329256960d4021
Version: 39e47767ec9b22f844c2a07c9d329256960d4021
Version: 39e47767ec9b22f844c2a07c9d329256960d4021
Version: 39e47767ec9b22f844c2a07c9d329256960d4021
Version: 39e47767ec9b22f844c2a07c9d329256960d4021
Version: 39e47767ec9b22f844c2a07c9d329256960d4021
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.252\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.202\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.165\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.128\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.75\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.16\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.6\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"4.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:12:39.142Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-71274\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:25:25.313Z\", \"dateReserved\": \"2026-03-17T09:08:18.458Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-06T11:27:07.525Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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