{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80620","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.774Z","datePublished":"2026-08-28T06:48:40.340Z","dateUpdated":"2026-08-28T06:48:40.340Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-28T06:48:40.340Z"},"descriptions":[{"lang":"en","value":"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":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/msi/msi.c"],"versions":[{"version":"4a7589b615a3db6792d36b874add86cd22188c95","lessThan":"82e120a7dd566c476ba923d30e3fb78e8118a1dd","status":"affected","versionType":"git"},{"version":"5f007c6acaa7d9a543b492c1e48c48a0ea1d7147","lessThan":"6848ca381edff84f87dd1b6973848c271541e813","status":"affected","versionType":"git"},{"version":"76f7abd4ee0188f06465bdd3c053fdc5e8595152","lessThan":"0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f","status":"affected","versionType":"git"},{"version":"aee8db5f048616990dbdefcc25689ade0a2620ec","lessThan":"f79519f636059b007d6abc91652f36dea4f54a20","status":"affected","versionType":"git"},{"version":"1a8d4c6ecb4c81261bcdf13556abd4a958eca202","lessThan":"3691a82be2095abaf3326a1cbf7b25858a1d959c","status":"affected","versionType":"git"},{"version":"1a8d4c6ecb4c81261bcdf13556abd4a958eca202","lessThan":"f64e03da0d83cb173743888bff4a7e61476a8fc2","status":"affected","versionType":"git"},{"version":"19bf27b450fcd5309bacd614b12bd7de1ac6535b","status":"affected","versionType":"git"},{"version":"6.1.165","lessThan":"6.1.178","status":"affected","versionType":"semver"},{"version":"6.6.128","lessThan":"6.6.145","status":"affected","versionType":"semver"},{"version":"6.12.75","lessThan":"6.12.97","status":"affected","versionType":"semver"},{"version":"6.18.16","lessThan":"6.18.40","status":"affected","versionType":"semver"},{"version":"6.19.6","lessThan":"6.20","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/msi/msi.c"],"versions":[{"version":"7.0","status":"affected"},{"version":"0","lessThan":"7.0","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.165","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.128","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.75","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.16","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.6"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd"},{"url":"https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813"},{"url":"https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f"},{"url":"https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20"},{"url":"https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c"},{"url":"https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2"}],"title":"Revert \"PCI/MSI: Unmap MSI-X region on error\"","x_generator":{"engine":"bippy-1.2.0"}}}}