CVE-2025-71274 (GCVE-0-2025-71274)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-08-05 12:12
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
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/rpmsg/rpmsg_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "392c6b68334aa0e0ae9aba95c0a366bcb0d92f5d",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            },
            {
              "lessThan": "d66b8074c555e8abb0ae19eea1c9f3635498bdde",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            },
            {
              "lessThan": "47615557447185917afa432b7958f87583c417cb",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            },
            {
              "lessThan": "90c8353f471821d7ccd4fe573a2402e056192494",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            },
            {
              "lessThan": "7654e6e3cd6bdee9602f6063b3c670bd556d7e61",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            },
            {
              "lessThan": "2e4a70f3c30910427e5ea848b799066d67b963d5",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            },
            {
              "lessThan": "954557957177c3c13d7c655976665b1170da5e50",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            },
            {
              "lessThan": "42023d4b6d2661a40ee2dcf7e1a3528a35c638ca",
              "status": "affected",
              "version": "39e47767ec9b22f844c2a07c9d329256960d4021",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/rpmsg/rpmsg_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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": {
        "dateUpdated": "2026-08-05T12:12:39.142Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "rpmsg: core: fix race in driver_override_show() and use core helper",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71274",
    "datePublished": "2026-05-06T11:27:07.525Z",
    "dateReserved": "2026-03-17T09:08:18.458Z",
    "dateUpdated": "2026-08-05T12:12:39.142Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.