CVE-2025-71274

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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."}], "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/rpmsg/rpmsg_core.c"], "versions": [{"version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d", "status": "affected", "versionType": "git"}, {"version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "d66b8074c555e8abb0ae19eea1c9f3635498bdde", "status": "affected", "versionType": "git"}, {"version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "47615557447185917afa432b7958f87583c417cb", "status": "affected", "versionType": "git"}, {"version": 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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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d", "versionType": "git"}, {"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "d66b8074c555e8abb0ae19eea1c9f3635498bdde", "versionType": "git"}, {"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "47615557447185917afa432b7958f87583c417cb", "versionType": "git"}, {"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "90c8353f471821d7ccd4fe573a2402e056192494", "versionType": "git"}, {"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "7654e6e3cd6bdee9602f6063b3c670bd556d7e61", "versionType": "git"}, {"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "2e4a70f3c30910427e5ea848b799066d67b963d5", "versionType": "git"}, {"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "954557957177c3c13d7c655976665b1170da5e50", "versionType": "git"}, {"status": "affected", "version": "39e47767ec9b22f844c2a07c9d329256960d4021", "lessThan": "42023d4b6d2661a40ee2dcf7e1a3528a35c638ca", "versionType": "git"}], "programFiles": ["drivers/rpmsg/rpmsg_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.18"}, {"status": "unaffected", "version": "0", "lessThan": "4.18", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.252", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.202", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.165", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.128", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.75", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.16", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.6", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/rpmsg/rpmsg_core.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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."}], "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"}, "dataVersion": "5.2"}

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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nrpmsg: core: corregir condici\u00f3n de carrera en driver_override_show() y usar la funci\u00f3n auxiliar del core\n\nLa funci\u00f3n driver_override_show lee la cadena driver_override sin mantener el device_lock. Sin embargo, la funci\u00f3n store modifica y libera la cadena mientras mantiene el device_lock. Esto crea una condici\u00f3n de carrera donde la cadena puede ser liberada por la funci\u00f3n store mientras es le\u00edda por la funci\u00f3n show, lo que lleva a un uso despu\u00e9s de liberaci\u00f3n.\n\nPara solucionar esto, reemplace la macro rpmsg_string_attr con funciones show y store expl\u00edcitas. La nueva driver_override_store utiliza la funci\u00f3n auxiliar est\u00e1ndar driver_set_override. Desde la introducci\u00f3n de driver_set_override, los comentarios en include/linux/rpmsg.h han indicado que esta funci\u00f3n auxiliar debe ser utilizada para establecer o borrar driver_override, pero la implementaci\u00f3n no fue actualizada hasta ahora.\n\nDebido a que driver_set_override modifica y libera la cadena mientras mantiene el device_lock, la nueva driver_override_show ahora mantiene correctamente el device_lock durante la operaci\u00f3n de lectura para prevenir la condici\u00f3n de carrera.\n\nAdem\u00e1s, dado que rpmsg_string_attr solo ha sido utilizada para driver_override, eliminar la macro simplifica el c\u00f3digo."}], "id": "CVE-2025-71274", "lastModified": "2026-10-19T19:17:18.423", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-71274", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:06:16.861984Z", "version": "2.0.3"}}]}, "published": "2026-05-06T12:16:27.447", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2e4a70f3c30910427e5ea848b799066d67b963d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/42023d4b6d2661a40ee2dcf7e1a3528a35c638ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/47615557447185917afa432b7958f87583c417cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7654e6e3cd6bdee9602f6063b3c670bd556d7e61"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/90c8353f471821d7ccd4fe573a2402e056192494"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/954557957177c3c13d7c655976665b1170da5e50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d66b8074c555e8abb0ae19eea1c9f3635498bdde"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: rpmsg: core: fix race in driver_override_show() and use core helper", "id": "2467104", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467104"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's `rpmsg` core. A race condition exists between the `driver_override_show()` and `driver_override_store()` functions. This allows the `driver_override` string to be freed while it is still being read, leading to a use-after-free vulnerability. This could potentially result in system instability or a denial of service."], "name": "CVE-2025-71274", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-71274\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-71274\nhttps://lore.kernel.org/linux-cve-announce/2026050617-CVE-2025-71274-6af4@gregkh/T"], "threat_severity": "Moderate"}

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