{ "schema_version": "1.6.1", "id": "RPI-CVE-2026-80620", "modified": "2026-10-07T14:35:31Z", "upstream": [ "CVE-2026-80620" ], "published": "2026-08-28T06:50:33Z", "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->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": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.12.75-1+rpt1~bookworm", "1:6.12.87-1+rpt1~bookworm", "1:6.12.93-1+rpt1", "1:6.12.96-1+rpt1" ], "ecosystem_specific": { "binaries": [ { 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"binary_name": "linux-image-6.12.93+rpt-rpi-v8", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.93+rpt-rpi-v8-rt", "binary_version": "1:6.12.93-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-2712", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v7l", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v8", "binary_version": "1:6.12.96-1+rpt1" }, { "binary_name": "linux-image-6.12.96+rpt-rpi-v8-rt", "binary_version": "1:6.12.96-1+rpt1" } ] }, "database_specific": { "per_version": { "1:6.12.75-1+rpt1~bookworm": { "linux_commit": "89050b1059997d38d55462b323b099a6436dc10d", "upstream_version": "6.12.75", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.97" }, "1:6.12.87-1+rpt1~bookworm": { "linux_commit": "ae4d75fb36deba0fe1a986d9bfae65755e082dd0", "upstream_version": "6.12.87", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.12.97" }, 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], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2026-80620" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-28T06:50:33Z" } }