CVE-2025-71274 (GCVE-0-2025-71274)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-08-05 12:12
VLAI
Title
rpmsg: core: fix race in driver_override_show() and use core helper
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < 392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d (git)
Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < d66b8074c555e8abb0ae19eea1c9f3635498bdde (git)
Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < 47615557447185917afa432b7958f87583c417cb (git)
Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < 90c8353f471821d7ccd4fe573a2402e056192494 (git)
Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < 7654e6e3cd6bdee9602f6063b3c670bd556d7e61 (git)
Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < 2e4a70f3c30910427e5ea848b799066d67b963d5 (git)
Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < 954557957177c3c13d7c655976665b1170da5e50 (git)
Affected: 39e47767ec9b22f844c2a07c9d329256960d4021 , < 42023d4b6d2661a40ee2dcf7e1a3528a35c638ca (git)
Create a notification for this product.
Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "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."
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    "dateUpdated": "2026-08-05T12:12:39.142Z",
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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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/rpmsg/rpmsg_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/rpmsg/rpmsg_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.16\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.6\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.18\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"90CED5DE-987F-4B30-AABF-64E292D6F3B5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"4002FC2B-1456-4666-B240-0EBF590C4671\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"797C7F46-D0BE-4FB8-A502-C5EF8E6B6654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\"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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:32:15+00:00",
      "cve": "CVE-2025-71274",
      "id": "CVE-2025-71274",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rpmsg: core: fix race in driver_override_show() and use core helper",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71274.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T00:23:53Z",
      "cve": "CVE-2025-71274",
      "id": "CVE-2025-71274",
      "initial_release_date": "2026-05-09T02:48:29Z",
      "product_status:known_affected": "538",
      "product_status:known_not_affected": "94",
      "product_status:recommended": "98",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-71274",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-71274.json",
      "version": "7"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.