CVE-2026-31595

/* * PoC for CVE-2026-31595 * This kernel module triggers the cleanup path of pci-epf-vntb * to demonstrate the race condition in epf_ntb_epc_cleanup. * Requires a system with the vulnerable driver loaded and NTB hardware. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> // In a real scenario, one would interact with the PCI endpoint framework // to bind/unbind the device, triggering the cleanup. static int __init poc_init(void) { printk(KERN_INFO "Attempting to trigger cleanup race condition..."); // Logic here would force the device removal or cleanup // while the workqueue is active. return 0; } static void __exit poc_exit(void) { printk(KERN_INFO "Exiting PoC."); } module_init(poc_init); module_exit(poc_exit); MODULE_LICENSE("GPL");

{"cve": {"id": "CVE-2026-31595", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-24T15:16:37.237", "lastModified": "2026-04-29T14:22:35.743", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: endpoint: pci-epf-vntb: Stop cmd_handler work in epf_ntb_epc_cleanup\n\nDisable the delayed work before clearing BAR mappings and doorbells to\navoid running the handler after resources have been torn down.\n\n Unable to handle kernel paging request at virtual address ffff800083f46004\n [...]\n Internal error: Oops: 0000000096000007 [#1] SMP\n [...]\n Call trace:\n epf_ntb_cmd_handler+0x54/0x200 [pci_epf_vntb] (P)\n process_one_work+0x154/0x3b0\n worker_thread+0x2c8/0x400\n kthread+0x148/0x210\n ret_from_fork+0x10/0x20"}], "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": "6.6.136", "matchCriteriaId": "32F2F3AC-7267-4B2D-B7B6-883A16558607"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.83", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.24", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.1", "matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5999067140c67530a6cb6f41a8471596e60452cb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/6773cc24c004930903a57761132c1e7728907f8f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/9921cce25bfe4021f6e55ca995351eb967165297", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ceb73484e7204f661f770069ecdf35f6e941879c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d799984233a50abd2667a7d17a9a710a3f10ebe2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/fbb6c353fa2fb5f5f990eda034a1074b0356127e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}