{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-80620", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80620", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-28T06:48:40.340Z", "updatedAt": "2026-08-28T06:48:40.340Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "Revert \"PCI/MSI: Unmap MSI-X region on error\"", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"PCI/MSI: Unmap MSI-X region on error\"\n\nThis reverts commit 1a8d4c6ecb4c81261bcdf13556abd4a958eca202.\n\nCommit 1a8d4c6ecb4c (\"PCI/MSI: Unmap MSI-X region on error\") added an\niounmap(dev->msix_base) on the error path of msix_capability_init() to\nrelease the MSI-X region when msix_setup_interrupts() fails.\n\nWhen msix_setup_interrupts() fails, the call chain is:\n\n msix_setup_interrupts()\n -> __msix_setup_interrupts()\n struct pci_dev *dev __free(free_msi_irqs) = __dev;\n ...\n return ret; // __free cleanup fires on error\n\nThe __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which\nalready handles the unmap:\n\n void pci_free_msi_irqs(struct pci_dev *dev)\n {\n pci_msi_teardown_msi_irqs(dev);\n if (dev->msix_base) {\n iounmap(dev->msix_base); // already unmapped here\n dev->msix_base = NULL; // and set to NULL\n }\n }\n\nSo dev->msix_base is unmapped and set to NULL before\nmsix_setup_interrupts() returns to msix_capability_init(). The\n\"goto out_unmap\" introduced by commit 1a8d4c6ecb4c (\"PCI/MSI: Unmap\nMSI-X region on error\") then calls iounmap() a second time on a NULL\npointer.\n\nThis was reproduced on Intel Emerald Rapids (192 CPUs) while\nrunning tools/testing/selftests/kexec/test_kexec_jump.sh:\n\n WARNING: CPU#44 at iounmap+0x2a/0xe0\n RIP: 0010:iounmap+0x2a/0xe0\n RDI: 0000000000000000\n Call Trace:\n msix_capability_init+0x317/0x3f0\n __pci_enable_msix_range+0x21d/0x2c0\n pci_alloc_irq_vectors_affinity+0xa9/0x130\n nvme_setup_io_queues+0x2a8/0x420 [nvme]\n nvme_reset_work+0x151/0x340 [nvme]\n ...\n\nRDI=0 confirms iounmap() is called with NULL.\n\nRestore the original \"goto out_disable\" and leave the unmap to the\nexisting __free(free_msi_irqs) cleanup.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "4a7589b615a3db6792d36b874add86cd22188c95", "status": "affected", "versionType": "git", "lessThan": "82e120a7dd566c476ba923d30e3fb78e8118a1dd" }, { "version": "5f007c6acaa7d9a543b492c1e48c48a0ea1d7147", "status": "affected", "versionType": "git", "lessThan": "6848ca381edff84f87dd1b6973848c271541e813" }, { "version": "76f7abd4ee0188f06465bdd3c053fdc5e8595152", "status": "affected", "versionType": "git", "lessThan": "0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f" }, { "version": "aee8db5f048616990dbdefcc25689ade0a2620ec", "status": "affected", "versionType": "git", "lessThan": "f79519f636059b007d6abc91652f36dea4f54a20" }, { "version": "1a8d4c6ecb4c81261bcdf13556abd4a958eca202", "status": "affected", "versionType": "git", "lessThan": "3691a82be2095abaf3326a1cbf7b25858a1d959c" }, { "version": "1a8d4c6ecb4c81261bcdf13556abd4a958eca202", "status": "affected", "versionType": "git", "lessThan": "f64e03da0d83cb173743888bff4a7e61476a8fc2" }, { "version": "19bf27b450fcd5309bacd614b12bd7de1ac6535b", "status": "affected", "versionType": "git" }, { "version": "6.1.165", "status": "affected", "versionType": "semver", "lessThan": "6.1.178" }, { "version": "6.6.128", "status": "affected", "versionType": "semver", "lessThan": "6.6.145" }, { "version": "6.12.75", "status": "affected", "versionType": "semver", "lessThan": "6.12.97" }, { "version": "6.18.16", "status": "affected", "versionType": "semver", "lessThan": "6.18.40" }, { "version": "6.19.6", "status": "affected", "versionType": "semver", "lessThan": "6.20" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "7.0", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "7.0" }, { "version": "6.1.178", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.145", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.97", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.40", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }