CVE-2026-23282

#include <stdio.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> /* * PoC for CVE-2026-23282 * This is a conceptual demonstration. Triggering the bug requires a specific * environment (Linux kernel with the vulnerability) and a condition where * SMB2_open_init or SMB2_close_init fails (e.g., during a reconnect). */ int main() { const char* file_path = "/mnt/smb_share/test_file.txt"; int fd; // Create a file on the mounted SMB share fd = open(file_path, O_CREAT | O_RDWR, 0644); if (fd < 0) { perror("Failed to create file"); return 1; } close(fd); printf("File created. Attempting to unlink...\n"); // In a vulnerable scenario, if the SMB connection is unstable // or forced to reconnect here, the unlink operation might // trigger the uninitialized variable bug in smb2_unlink(). if (unlink(file_path) != 0) { perror("Unlink failed"); } else { printf("File unlinked.\n"); } return 0; }

{"cve": {"id": "CVE-2026-23282", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:22.823", "lastModified": "2026-05-22T00:24:34.460", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix oops due to uninitialised var in smb2_unlink()\n\nIf SMB2_open_init() or SMB2_close_init() fails (e.g. reconnect), the\niovs set @rqst will be left uninitialised, hence calling\nSMB2_open_free(), SMB2_close_free() or smb2_set_related() on them will\noops.\n\nFix this by initialising @close_iov and @open_iov before setting them\nin @rqst."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsmb: cliente: corregir oops debido a una variable no inicializada en smb2_unlink()\n\nSi SMB2_open_init() o SMB2_close_init() falla (por ejemplo, reconexión), el conjunto de iovs @rqst quedará sin inicializar, por lo tanto, llamar a SMB2_open_free(), SMB2_close_free() o smb2_set_related() en ellos causará un oops.\n\nSolucionar esto inicializando @close_iov y @open_iov antes de establecerlos en @rqst."}], "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-908"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.1", "versionEndExcluding": "6.18.17", "matchCriteriaId": "0FAD3309-B3B6-4F1D-803C-08B4C96E115E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.7", "matchCriteriaId": "69245D10-0B71-485E-80C3-A64F077004D3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*", "matchCriteriaId": "7CC8B11D-82DC-4958-8DC7-BF5CC829A5E9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/048efe129a297256d3c2088cf8d79515ff5ec864", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/86163b98891aa9800f6103252e5acc7bb98afb91", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/dc710c87af3341554d02d634ada1d2036c49a94a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}