CVE-2025-21694 (GCVE-0-2025-21694)

Vulnerability from cvelistv5 – Published: 2025-02-12 13:27 – Updated: 2026-05-23 15:56
VLAI
Title
fs/proc: fix softlockup in __read_vmcore (part 2)
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the number of softlockups in __read_vmcore at kdump time have gone down, but they still happen sometimes. In a memory constrained environment like the kdump image, a softlockup is not just a harmless message, but it can interfere with things like RCU freeing memory, causing the crashdump to get stuck. The second loop in __read_vmcore has a lot more opportunities for natural sleep points, like scheduling out while waiting for a data write to happen, but apparently that is not always enough. Add a cond_resched() to the second loop in __read_vmcore to (hopefully) get rid of the softlockups.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 803d5a33d5ffdc2d86dcc0cfa01655a330612cdb , < 84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 (git)
Affected: 70c1835e776c8447c1aca87ddb38cfe764fe756a , < 80da29deb88a3a907441fc35bb7bac309f31e713 (git)
Affected: e1b160a50c756e0efbea290b9bf5117cb80e8c4b , < 649b266606bc413407ce315f710c8ce8a88ee30a (git)
Affected: a373ad833a6bfe4bc6cedcf7e56a99cc6fd9a193 , < 65c367bd9d4f43513c7f837df5753bea9561b836 (git)
Affected: 518fbd644dabb6aedbdd4939c6c9cc1bf651459f , < a5a2ee8144c3897d37403a69118c3e3dc5713958 (git)
Affected: 5cbcb62dddf5346077feb82b7b0c9254222d3445 , < 80828540dad0757b6337c6561d49c81038f38d87 (git)
Affected: 5cbcb62dddf5346077feb82b7b0c9254222d3445 , < cbc5dde0a461240046e8a41c43d7c3b76d5db952 (git)
Affected: 7bdf1d550ddfcd9ab797087421f77b7aceddc8a7 (git)
Affected: e8780e8a0e25dc4c3927f611ec8970d26c0c7369 (git)
Affected: 5.4.279 , < 5.4.290 (semver)
Affected: 5.10.221 , < 5.10.234 (semver)
Affected: 5.15.162 , < 5.15.177 (semver)
Affected: 6.1.95 , < 6.1.127 (semver)
Affected: 6.6.35 , < 6.6.74 (semver)
Affected: 4.19.317 , < 4.20 (semver)
Affected: 6.9.6 , < 6.10 (semver)
Create a notification for this product.
Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 5.4.290 , ≤ 5.4.* (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.177 , ≤ 5.15.* (semver)
Unaffected: 6.1.127 , ≤ 6.1.* (semver)
Unaffected: 6.6.74 , ≤ 6.6.* (semver)
Unaffected: 6.12.11 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.2 (custom)
Create a notification for this product.
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Affected: 0 , < V3.2 (custom)
Create a notification for this product.
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.2 (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
Create a notification for this product.
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En un entorno con restricciones de memoria como la imagen kdump, un softlockup no es solo un mensaje inofensivo, sino que puede interferir con cosas como la liberaci\u00f3n de memoria por parte de RCU, lo que hace que el crashdump se quede atascado. El segundo bucle en __read_vmcore tiene muchas m\u00e1s oportunidades para puntos de suspensi\u00f3n naturales, como programar la salida mientras se espera que se escriban datos, pero aparentemente eso no siempre es suficiente. Agregue un cond_resched() al segundo bucle en __read_vmcore para (con suerte) deshacerse de los 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:35:49+00:00",
      "cve": "CVE-2025-21694",
      "id": "CVE-2025-21694",
      "initial_release_date": "2025-02-12T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/proc: fix softlockup in __read_vmcore (part 2)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21694.json",
      "version": "3"
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      "current_release_date": "2026-05-21T02:41:56Z",
      "cve": "CVE-2025-21694",
      "id": "CVE-2025-21694",
      "initial_release_date": "2025-02-13T00:20:42Z",
      "product_status:known_affected": "13",
      "product_status:known_not_affected": "356",
      "product_status:recommended": "43",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21694",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21694.json",
      "version": "28"
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{\"status\": \"unaffected\", \"version\": \"5.10.234\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.177\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.127\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.74\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/proc/vmcore.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2\"}, {\"url\": \"https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713\"}, {\"url\": \"https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a\"}, {\"url\": \"https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836\"}, {\"url\": \"https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958\"}, {\"url\": \"https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87\"}, {\"url\": \"https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/proc: fix softlockup in __read_vmcore (part 2)\\n\\nSince commit 5cbcb62dddf5 (\\\"fs/proc: fix softlockup in __read_vmcore\\\") the\\nnumber of softlockups in __read_vmcore at kdump time have gone down, but\\nthey still happen sometimes.\\n\\nIn a memory constrained environment like the kdump image, a softlockup is\\nnot just a harmless message, but it can interfere with things like RCU\\nfreeing memory, causing the crashdump to get stuck.\\n\\nThe second loop in __read_vmcore has a lot more opportunities for natural\\nsleep points, like scheduling out while waiting for a data write to\\nhappen, but apparently that is not always enough.\\n\\nAdd a cond_resched() to the second loop in __read_vmcore to (hopefully)\\nget rid of the softlockups.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.290\", \"versionStartIncluding\": \"5.4.279\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.234\", \"versionStartIncluding\": \"5.10.221\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.177\", \"versionStartIncluding\": \"5.15.162\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.127\", \"versionStartIncluding\": \"6.1.95\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.74\", \"versionStartIncluding\": \"6.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.11\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.317\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.9.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:56:54.899Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21694\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:56:54.899Z\", \"dateReserved\": \"2024-12-29T08:45:45.743Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-12T13:27:53.763Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.