{"id":"CVE-2025-71274","state":"PUBLISHED","title":"rpmsg: core: fix race in driver_override_show() and use core helper","description":"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.","publishedAt":"2026-05-06T11:27:07.525Z","updatedAt":"2026-10-19T18:25:25.313Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"d66b8074c555e8abb0ae19eea1c9f3635498bdde","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"47615557447185917afa432b7958f87583c417cb","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"90c8353f471821d7ccd4fe573a2402e056192494","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"7654e6e3cd6bdee9602f6063b3c670bd556d7e61","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"2e4a70f3c30910427e5ea848b799066d67b963d5","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"954557957177c3c13d7c655976665b1170da5e50","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"42023d4b6d2661a40ee2dcf7e1a3528a35c638ca","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rpmsg/rpmsg_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.18","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rpmsg/rpmsg_core.c"]}],"references":["https://git.kernel.org/stable/c/392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d","https://git.kernel.org/stable/c/d66b8074c555e8abb0ae19eea1c9f3635498bdde","https://git.kernel.org/stable/c/47615557447185917afa432b7958f87583c417cb","https://git.kernel.org/stable/c/90c8353f471821d7ccd4fe573a2402e056192494","https://git.kernel.org/stable/c/7654e6e3cd6bdee9602f6063b3c670bd556d7e61","https://git.kernel.org/stable/c/2e4a70f3c30910427e5ea848b799066d67b963d5","https://git.kernel.org/stable/c/954557957177c3c13d7c655976665b1170da5e50","https://git.kernel.org/stable/c/42023d4b6d2661a40ee2dcf7e1a3528a35c638ca"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:10:04.440Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/71xxx/CVE-2025-71274.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-71274","state":"PUBLISHED","datePublished":"2026-05-06T11:27:07.525Z","dateUpdated":"2026-10-19T18:25:25.313Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-17T09:08:18.458Z"},"containers":{"cna":{"title":"rpmsg: core: fix race in driver_override_show() and use core helper","descriptions":[{"lang":"en","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"d66b8074c555e8abb0ae19eea1c9f3635498bdde","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"47615557447185917afa432b7958f87583c417cb","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"90c8353f471821d7ccd4fe573a2402e056192494","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"7654e6e3cd6bdee9602f6063b3c670bd556d7e61","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"2e4a70f3c30910427e5ea848b799066d67b963d5","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"954557957177c3c13d7c655976665b1170da5e50","versionType":"git"},{"version":"39e47767ec9b22f844c2a07c9d329256960d4021","status":"affected","lessThan":"42023d4b6d2661a40ee2dcf7e1a3528a35c638ca","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rpmsg/rpmsg_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.18","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/rpmsg/rpmsg_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d"},{"url":"https://git.kernel.org/stable/c/d66b8074c555e8abb0ae19eea1c9f3635498bdde"},{"url":"https://git.kernel.org/stable/c/47615557447185917afa432b7958f87583c417cb"},{"url":"https://git.kernel.org/stable/c/90c8353f471821d7ccd4fe573a2402e056192494"},{"url":"https://git.kernel.org/stable/c/7654e6e3cd6bdee9602f6063b3c670bd556d7e61"},{"url":"https://git.kernel.org/stable/c/2e4a70f3c30910427e5ea848b799066d67b963d5"},{"url":"https://git.kernel.org/stable/c/954557957177c3c13d7c655976665b1170da5e50"},{"url":"https://git.kernel.org/stable/c/42023d4b6d2661a40ee2dcf7e1a3528a35c638ca"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Triggering uses concurrent read and write operations on the local rpmsg driver_override sysfs attribute; remote rpmsg traffic does not directly reach the vulnerable show function.\nAC:L - Separate sysfs opens have only per-open locking, allowing concurrent loops to force the load-versus-free window repeatedly. Stress testing reproduced the race, and a principal controlling both operations needs no external condition.\nPR:L - The attribute is world-readable at mode 0644, and the original report demonstrated pointer leakage to unprivileged readers. Although direct writes are root-owned, delegated rpmsg management is reasonable in embedded deployments, making low privileges the higher defensible value.\nUI:N - Once an rpmsg device exists, attacker-driven concurrent sysfs operations require no action from another user.\nS:U - The vulnerable callbacks and affected memory are within the same host kernel security authority; no VM, IOMMU, or other scope boundary is crossed.\nC:H - The freed string is consumed as an unbounded string and returned through sysfs, with stress testing leaking pointer-like kernel bytes. Heap reuse can expose additional kernel memory, making high confidentiality impact appropriate for this UAF.\nI:H - The stale string is formatted with unbounded sprintf into a PAGE_SIZE buffer; unterminated reclaimed data, or a maximum-sized override, can overrun that buffer. This kernel out-of-bounds write can corrupt adjacent memory and potentially enable control-flow hijacking.\nA:H - The UAF was reproduced under KASAN, and invalid stale-memory access or resulting buffer corruption can cause a kernel oops or panic repeatedly."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:12:39.142Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"5.10.252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2025-71274","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:06:16.861984Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T18:25:25.313Z"}}]}}}