CVE-2026-23250

/* CVE-2026-23250 PoC - XFS scrub function NULL pointer issue * This is a conceptual PoC demonstrating the vulnerability trigger * Requires: Local access, ability to mount XFS filesystem */ #include <stdio.h> #include <stdlib.h> #include <string.h> /* Simulated vulnerable function behavior */ void* xchk_scrub_create_subord_vuln(int memory_available) { void *ptr = NULL; /* Simulate memory allocation failure scenario */ if (!memory_available) { /* VULNERABLE: Returns mangled ENOMEM instead of NULL */ return (void*)-ENOMEM; /* Should return NULL */ } ptr = malloc(1024); return ptr; } /* Vulnerable caller that doesn't check properly */ int caller_vuln(int memory_available) { void *subord = xchk_scrub_create_subord_vuln(memory_available); /* VULNERABLE: Only checks for NULL, not for error values */ if (subord == NULL) { return -ENOMEM; } /* This code path is reached with mangled return value */ /* leading to potential NULL pointer dereference */ memset(subord, 0, 1024); /* Undefined behavior */ return 0; } /* Fixed version */ void* xchk_scrub_create_subord_fixed(int memory_available) { void *ptr = NULL; if (!memory_available) { /* FIXED: Properly return NULL on ENOMEM */ return NULL; } ptr = malloc(1024); return ptr; } int main() { printf("CVE-2026-23250 PoC - XFS xchk_scrub_create_subord\n"); printf("Trigger condition: Memory pressure during XFS scrub operation\n"); printf("Impact: System crash / Denial of Service\n"); return 0; }

{"cve": {"id": "CVE-2026-23250", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-18T18:16:22.950", "lastModified": "2026-05-21T18:32:11.127", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: check return value of xchk_scrub_create_subord\n\nFix this function to return NULL instead of a mangled ENOMEM, then fix\nthe callers to actually check for a null pointer and return ENOMEM.\nMost of the corrections here are for code merged between 6.2 and 6.10."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfs: comprobar el valor de retorno de xchk_scrub_create_subord\n\nCorregir esta función para que devuelva NULL en lugar de un ENOMEM corrupto, luego corregir a los llamadores para que realmente comprueben si hay un puntero nulo y devuelvan ENOMEM. La mayoría de las correcciones aquí son para código fusionado entre 6.2 y 6.10."}], "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": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.75", "matchCriteriaId": "CB67FC73-CF7B-41DB-A5A5-423C53BE93EF"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2b658d1249666cc55af9484dcf5f45ca438d4ecc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b2df809edd8cb7d1c3e19d9f6aabc2bd55d2bfb6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ca27313fb3f23e4ac18532ede4ec1c7cc5814c4a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d6f3f7d4dd8a179394cef03c00993d57f5f68601", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}