{"id":"CVE-2026-80620","summary":"Revert \"PCI/MSI: Unmap MSI-X region on error\"","details":"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-\u003emsix_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    -\u003e __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-\u003emsix_base) {\n          iounmap(dev-\u003emsix_base);   // already unmapped here\n          dev-\u003emsix_base = NULL;     // and set to NULL\n      }\n  }\n\nSo dev-\u003emsix_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.","modified":"2026-08-30T03:48:21.006399356Z","published":"2026-08-28T06:48:40.340Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80620.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80620.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80620"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4a7589b615a3db6792d36b874add86cd22188c95"},{"fixed":"82e120a7dd566c476ba923d30e3fb78e8118a1dd"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5f007c6acaa7d9a543b492c1e48c48a0ea1d7147"},{"fixed":"6848ca381edff84f87dd1b6973848c271541e813"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"76f7abd4ee0188f06465bdd3c053fdc5e8595152"},{"fixed":"0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"aee8db5f048616990dbdefcc25689ade0a2620ec"},{"fixed":"f79519f636059b007d6abc91652f36dea4f54a20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1a8d4c6ecb4c81261bcdf13556abd4a958eca202"},{"fixed":"3691a82be2095abaf3326a1cbf7b25858a1d959c"},{"fixed":"f64e03da0d83cb173743888bff4a7e61476a8fc2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"19bf27b450fcd5309bacd614b12bd7de1ac6535b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.165"},{"fixed":"6.1.178"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.128"},{"fixed":"6.6.145"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.75"},{"fixed":"6.12.97"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.16"},{"fixed":"6.18.40"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.19.6"},{"fixed":"6.20"}]}],"versions":["v6.1.177","v6.1.176","v6.1.175","v6.1.174","v6.1.173","v6.1.172","v6.1.171","v6.1.170","v6.1.169","v6.1.168","v6.1.167","v6.1.166","v6.1.165","v6.6.144","v6.6.143","v6.6.142","v6.6.141","v6.6.140","v6.6.139","v6.6.138","v6.6.137","v6.6.136","v6.6.135","v6.6.134","v6.6.133","v6.6.132","v6.6.131","v6.6.130","v6.6.129","v6.6.128","v6.12.96","v6.12.95","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.12.82","v6.12.81","v6.12.80","v6.12.79","v6.12.78","v6.12.77","v6.12.76","v6.12.75","v6.18.39","v6.18.38","v6.18.37","v6.18.36","v6.18.35","v6.18.34","v6.18.33","v6.18.32","v6.18.31","v6.18.30","v6.18.29","v6.18.28","v6.18.27","v6.18.26","v6.18.25","v6.18.24","v6.18.23","v6.18.22","v6.18.21","v6.18.20","v6.18.19","v6.18.18","v6.18.17","v6.18.16","v6.19-rc2","v6.19","v6.19.5","v6.19.4","v6.19.3","v6.19.2","v6.19.1","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.19-rc3","v6.18","v6.18-rc1","v6.18-rc7","v6.18-rc3","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.18-rc4","v6.17","v6.17-rc7","v6.17-rc1","v6.17-rc2","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.16-rc6","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.14-rc3","v6.15","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.15-rc5","v6.14","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.14-rc4","v6.14-rc5","v6.14-rc2","v6.13","v6.13-rc1","v6.13-rc6","v6.13-rc7","v6.13-rc2","v6.13-rc5","v6.13-rc3","v6.12-rc1","v6.13-rc4","v6.12","v6.12-rc7","v6.12-rc3","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.12-rc2","v6.11-rc1","v6.11-rc5","v6.11","v6.11-rc7","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.11-rc4","v6.11-rc2","v6.10","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9"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