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

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-10-19 18:25
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:06 UTC
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
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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)
guessed Create a notification for this product.
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            "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."
          },
          {
            "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",
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      "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",
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      "cve": "CVE-2025-71274",
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      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2025-71274",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2025-71274.json",
      "version": "20"
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                    "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
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              "dateUpdated": "2026-10-16T15:06:17.714Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
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              "product": "Linux",
              "programFiles": [
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              "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."
            }
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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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        "dateReserved": "2026-03-17T09:08:18.458Z",
        "dateUpdated": "2026-10-19T18:25:25.313Z",
        "state": "PUBLISHED"
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  }
}



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