CVE-2025-71106

// PoC for CVE-2025-71106 // This vulnerability is triggered when filesystem_freeze_enabled is false // but the reversed logic causes all filesystems to freeze #include <stdio.h> #include <stdlib.h> #include <string.h> /* * Trigger conditions: * 1. Set filesystem_freeze_enabled = 0 (disabled) * 2. The reversed check in filesystems_freeze_callback() will: * - Execute filesystem freeze operations * - Trigger WARN_ON_ONCE() in __set_task_frozen() * - Potentially cause DoS */ int main() { printf("CVE-2025-71106 PoC\n"); printf("Linux Kernel filesystems_freeze_callback() Logic Reversal\n\n"); printf("Vulnerability Details:\n"); printf("- Function: filesystems_freeze_callback()\n"); printf("- Issue: freeze_all_ptr check logic is reversed\n"); printf("- Trigger: filesystem_freeze_enabled=false triggers freeze\n"); printf("- Impact: System DoS via filesystem freeze\n\n"); printf("This is a LOCAL low-privilege vulnerability.\n"); printf("CVSS 3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\n"); printf("CVSS Score: 5.5 (Medium)\n\n"); printf("Note: Actual exploitation requires kernel-level access.\n"); printf("Refer to kernel commits for fix:\n"); printf("- 222047f68e8565c558728f792f6fef152a1d4d51\n"); printf("- b107196729ff6b9d6cde0a71f49c1243def43328\n"); return 0; }

{"cve": {"id": "CVE-2025-71106", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-01-14T15:15:59.640", "lastModified": "2026-03-25T18:55:10.403", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: PM: Fix reverse check in filesystems_freeze_callback()\n\nThe freeze_all_ptr check in filesystems_freeze_callback() introduced by\ncommit a3f8f8662771 (\"power: always freeze efivarfs\") is reverse which\nquite confusingly causes all file systems to be frozen when\nfilesystem_freeze_enabled is false.\n\nOn my systems it causes the WARN_ON_ONCE() in __set_task_frozen() to\ntrigger, most likely due to an attempt to freeze a file system that is\nnot ready for that.\n\nAdd a logical negation to the check in question to reverse it as\nappropriate."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: PM: Corrige la comprobación inversa en filesystems_freeze_callback()\n\nLa comprobación freeze_all_ptr en filesystems_freeze_callback() introducida por el commit a3f8f8662771 ('power: always freeze efivarfs') es inversa, lo que de forma bastante confusa provoca que todos los sistemas de archivos se congelen cuando filesystem_freeze_enabled es falso.\n\nEn mis sistemas, provoca que el WARN_ON_ONCE() en __set_task_frozen() se active, muy probablemente debido a un intento de congelar un sistema de archivos que no está listo para ello.\n\nAñade una negación lógica a la comprobación en cuestión para invertirla según corresponda."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "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": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.1", "versionEndExcluding": "6.18.3", "matchCriteriaId": "A3586EB6-087D-41EA-AD79-2AA54D44AAA1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*", "matchCriteriaId": "DCE57113-2223-4308-A0F2-5E6ECFBB3C23"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*", "matchCriteriaId": "3EF854A1-ABB1-4E93-BE9A-44569EC76C0D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*", "matchCriteriaId": "F5DC0CA6-F0AF-4DDF-A882-3DADB9A886A7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*", "matchCriteriaId": "EB5B7DFC-C36B-45D8-922C-877569FDDF43"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/222047f68e8565c558728f792f6fef152a1d4d51", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b107196729ff6b9d6cde0a71f49c1243def43328", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}