CVE-2025-21804 (GCVE-0-2025-21804)

Vulnerability from cvelistv5 – Published: 2025-02-27 20:00 – Updated: 2026-08-05 11:54
VLAI
Title
PCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region() The rcar_pcie_parse_outbound_ranges() uses the devm_request_mem_region() macro to request a needed resource. A string variable that lives on the stack is then used to store a dynamically computed resource name, which is then passed on as one of the macro arguments. This can lead to undefined behavior. Depending on the current contents of the memory, the manifestations of errors may vary. One possible output may be as follows: $ cat /proc/iomem 30000000-37ffffff : 38000000-3fffffff : Sometimes, garbage may appear after the colon. In very rare cases, if no NULL-terminator is found in memory, the system might crash because the string iterator will overrun which can lead to access of unmapped memory above the stack. Thus, fix this by replacing outbound_name with the name of the previously requested resource. With the changes applied, the output will be as follows: $ cat /proc/iomem 30000000-37ffffff : memory2 38000000-3fffffff : memory3 [kwilczynski: commit log]
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2a6d0d63d99956a66f6605832f11755d74a41951 , < 7a47e14c5fb0b6dba7073be7b0119fb8fe864e01 (git)
Affected: 2a6d0d63d99956a66f6605832f11755d74a41951 , < 6987e021b64cbb49981d140bb72d9d1466f191c4 (git)
Affected: 2a6d0d63d99956a66f6605832f11755d74a41951 , < 24576899c49509c0d533bcf569139f691d8f7af7 (git)
Affected: 2a6d0d63d99956a66f6605832f11755d74a41951 , < 2c54b9fca1755e80a343ccfde0652dc5ea4744b2 (git)
Affected: 2a6d0d63d99956a66f6605832f11755d74a41951 , < 9ff46b0bfeb6e0724a4ace015aa7a0b887cdb7c1 (git)
Affected: 2a6d0d63d99956a66f6605832f11755d74a41951 , < 44708208c2a4b828a57a2abe7799c9d3962e7eaa (git)
Affected: 2a6d0d63d99956a66f6605832f11755d74a41951 , < 2d2da5a4c1b4509f6f7e5a8db015cd420144beb4 (git)
Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.129 , ≤ 6.1.* (semver)
Unaffected: 6.6.76 , ≤ 6.6.* (semver)
Unaffected: 6.12.13 , ≤ 6.12.* (semver)
Unaffected: 6.13.2 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()\n\nThe rcar_pcie_parse_outbound_ranges() uses the devm_request_mem_region()\nmacro to request a needed resource. A string variable that lives on the\nstack is then used to store a dynamically computed resource name, which\nis then passed on as one of the macro arguments. This can lead to\nundefined behavior.\n\nDepending on the current contents of the memory, the manifestations of\nerrors may vary. One possible output may be as follows:\n\n  $ cat /proc/iomem\n  30000000-37ffffff :\n  38000000-3fffffff :\n\nSometimes, garbage may appear after the colon.\n\nIn very rare cases, if no NULL-terminator is found in memory, the system\nmight crash because the string iterator will overrun which can lead to\naccess of unmapped memory above the stack.\n\nThus, fix this by replacing outbound_name with the name of the previously\nrequested resource. With the changes applied, the output will be as\nfollows:\n\n  $ cat /proc/iomem\n  30000000-37ffffff : memory2\n  38000000-3fffffff : memory3\n\n[kwilczynski: commit log]"
        }
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              "lang": "en",
              "value": "AV:L - The dangling resource name is dereferenced when a local process reads the world-readable /proc/iomem (r_show() in kernel/resource.c), requiring a local account on the affected R-Car endpoint system. Nothing in the path is reachable from the network or from PCIe link traffic.\nAC:L - On affected hardware the poisoned resource entries are created unconditionally during boot-time probe, and every single read of /proc/iomem dereferences the stale stack pointer \u2014 no race, timing window, or memory-layout condition outside the attacker\u0027s control is involved. The attacker can also re-read repeatedly to sample different stack contents.\nPR:L - /proc/iomem is registered with mode 0 which resolves to 0444, and r_show() gates only the address fields behind CAP_SYS_ADMIN while printing r-\u003ename to everyone, so an ordinary unprivileged user triggers the bug. No capability, namespace, or group membership is needed.\nUI:N - The attacker performs the read themselves; no victim action, no filesystem mount, and no administrator step is required beyond the driver having probed normally at boot.\nS:U - The stale read and any resulting fault occur entirely within the kernel\u0027s own security authority on the same host, with no crossing into a hypervisor, IOMMU, or other security scope.\nC:H - seq_printf(\"%s\") walks the reclaimed kernel stack from a fixed address until it happens to hit a NUL byte, so an unbounded quantity of stale kernel stack \u2014 potentially including saved return addresses and kernel pointers usable to defeat KASLR \u2014 is copied verbatim into a file readable by every local user. This is an unbounded out-of-scope read, not a few-byte bounded disclosure.\nI:N - The defect is a stale-pointer read only; devm_request_mem_region() merely stores the pointer and no code path writes through it, so no kernel object is corrupted and no write primitive arises.\nA:H - The commit explicitly documents that with no NUL terminator the string iterator overruns into unmapped memory above the stack and crashes the system; with VMAP_STACK the guard page (or an outright vfree\u0027d stack) turns the dereference into a kernel oops. Any local user can attempt this on demand by reading /proc/iomem."
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    "dateReserved": "2024-12-29T08:45:45.771Z",
    "dateUpdated": "2026-08-05T11:54:33.538Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21804\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T20:16:03.030\",\"lastModified\":\"2026-07-30T06:21:32.150\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nPCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()\\n\\nThe rcar_pcie_parse_outbound_ranges() uses the devm_request_mem_region()\\nmacro to request a needed resource. A string variable that lives on the\\nstack is then used to store a dynamically computed resource name, which\\nis then passed on as one of the macro arguments. This can lead to\\nundefined behavior.\\n\\nDepending on the current contents of the memory, the manifestations of\\nerrors may vary. One possible output may be as follows:\\n\\n  $ cat /proc/iomem\\n  30000000-37ffffff :\\n  38000000-3fffffff :\\n\\nSometimes, garbage may appear after the colon.\\n\\nIn very rare cases, if no NULL-terminator is found in memory, the system\\nmight crash because the string iterator will overrun which can lead to\\naccess of unmapped memory above the stack.\\n\\nThus, fix this by replacing outbound_name with the name of the previously\\nrequested resource. With the changes applied, the output will be as\\nfollows:\\n\\n  $ cat /proc/iomem\\n  30000000-37ffffff : memory2\\n  38000000-3fffffff : memory3\\n\\n[kwilczynski: commit log]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: PCI: rcar-ep: Se corrige la variable incorrecta utilizada al llamar a devm_request_mem_region(). rcar_pcie_parse_outbound_ranges() utiliza la macro devm_request_mem_region() para solicitar un recurso necesario. Luego, se utiliza una variable de cadena que se encuentra en la pila para almacenar un nombre de recurso calculado din\u00e1micamente, que luego se pasa como uno de los argumentos de la macro. Esto puede provocar un comportamiento indefinido. Seg\u00fan el contenido actual de la memoria, las manifestaciones de los errores pueden variar. Una posible salida puede ser la siguiente: $ cat /proc/iomem 30000000-37ffffff : 38000000-3fffffff : A veces, puede aparecer basura despu\u00e9s de los dos puntos. En casos muy raros, si no se encuentra un terminador NULL en la memoria, el sistema puede bloquearse porque el iterador de cadena se desbordar\u00e1, lo que puede provocar el acceso a la memoria no asignada por encima de la pila. Por lo tanto, solucione este problema reemplazando outbound_name con el nombre del recurso solicitado anteriormente. Con los cambios aplicados, el resultado ser\u00e1 el siguiente: $ cat /proc/iomem 30000000-37ffffff : memory2 38000000-3fffffff : memory3 [kwilczynski: commit log]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/pci/controller/pcie-rcar-ep.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2a6d0d63d99956a66f6605832f11755d74a41951\",\"lessThan\":\"7a47e14c5fb0b6dba7073be7b0119fb8fe864e01\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a6d0d63d99956a66f6605832f11755d74a41951\",\"lessThan\":\"6987e021b64cbb49981d140bb72d9d1466f191c4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a6d0d63d99956a66f6605832f11755d74a41951\",\"lessThan\":\"24576899c49509c0d533bcf569139f691d8f7af7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a6d0d63d99956a66f6605832f11755d74a41951\",\"lessThan\":\"2c54b9fca1755e80a343ccfde0652dc5ea4744b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a6d0d63d99956a66f6605832f11755d74a41951\",\"lessThan\":\"9ff46b0bfeb6e0724a4ace015aa7a0b887cdb7c1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a6d0d63d99956a66f6605832f11755d74a41951\",\"lessThan\":\"44708208c2a4b828a57a2abe7799c9d3962e7eaa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2a6d0d63d99956a66f6605832f11755d74a41951\",\"lessThan\":\"2d2da5a4c1b4509f6f7e5a8db015cd420144beb4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/pci/controller/pcie-rcar-ep.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.235\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.179\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.129\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.76\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.13\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.2\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14\",\"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:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.8\",\"versionEndExcluding\":\"5.10.235\",\"matchCriteriaId\":\"17FFC38A-2679-443B-8BDB-D553D86D60EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.179\",\"matchCriteriaId\":\"C708062C-4E1B-465F-AE6D-C09C46400875\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.129\",\"matchCriteriaId\":\"2DA5009C-C9B9-4A1D-9B96-78427E8F232C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.76\",\"matchCriteriaId\":\"A6D70701-9CB6-4222-A957-00A419878993\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.13\",\"matchCriteriaId\":\"2897389C-A8C3-4D69-90F2-E701B3D66373\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.2\",\"matchCriteriaId\":\"6D4116B1-1BFD-4F23-BA84-169CC05FC5A3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/24576899c49509c0d533bcf569139f691d8f7af7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2c54b9fca1755e80a343ccfde0652dc5ea4744b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2d2da5a4c1b4509f6f7e5a8db015cd420144beb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/44708208c2a4b828a57a2abe7799c9d3962e7eaa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6987e021b64cbb49981d140bb72d9d1466f191c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7a47e14c5fb0b6dba7073be7b0119fb8fe864e01\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9ff46b0bfeb6e0724a4ace015aa7a0b887cdb7c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-30T10:13:35+00:00",
      "cve": "CVE-2025-21804",
      "id": "CVE-2025-21804",
      "initial_release_date": "2025-02-27T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: PCI: rcar-ep: Fix incorrect variable used when calling devm_request_mem_region()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21804.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-03T03:54:03Z",
      "cve": "CVE-2025-21804",
      "id": "CVE-2025-21804",
      "initial_release_date": "2025-03-01T02:52:34Z",
      "product_status:known_affected": "449",
      "product_status:known_not_affected": "229",
      "product_status:recommended": "335",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21804",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21804.json",
      "version": "41"
    }
  }
}



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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.