{"id":"CVE-2026-89455","title":"PCI: plda: Fix use-after-free of event IRQs during teardown","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: plda: Fix use-after-free of event IRQs during teardown\n\nplda_pcie_irq_domain_deinit() removes pcie->event_domain via\nirq_domain_remove(), but the per-event IRQs ma…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 76c9113968079140cb2f885631db422170f32105 < 1d0159e139261996a3ca21798d9114aab2124d3c","Linux >= 76c9113968079140cb2f885631db422170f32105 < 01c2f0c66bd1f892db9c6e82976da6b463cc4427","Linux >= 76c9113968079140cb2f885631db422170f32105 < e3589ca5f2e6477774753a2202c21509428d4701","Linux >= 76c9113968079140cb2f885631db422170f32105 < 26b73bae01d6eb81a4a38f36101812f20b2639de","Linux 6.11"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:47:04.758Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89455","references":[{"url":"https://git.kernel.org/stable/c/1d0159e139261996a3ca21798d9114aab2124d3c"},{"url":"https://git.kernel.org/stable/c/01c2f0c66bd1f892db9c6e82976da6b463cc4427"},{"url":"https://git.kernel.org/stable/c/e3589ca5f2e6477774753a2202c21509428d4701"},{"url":"https://git.kernel.org/stable/c/26b73bae01d6eb81a4a38f36101812f20b2639de"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89455.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89455"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532263"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89455"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89455"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89455.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.1048,"ingestedAt":"2026-09-14T00:35:28.531Z","slug":"CVE-2026-89455","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nPCI: plda: Fix use-after-free of event IRQs during teardown\n\nplda_pcie_irq_domain_deinit() removes pcie->event_domain via\nirq_domain_remove(), but the per-event IRQs mapped from that domain\nare requested with devm_request_irq() in plda_init_interrupts(). The\nactual free_irq() for a devm-managed IRQ is deferred by devres until\nafter the calling probe()/remove() function returns.\n\nThis means irq_domain_remove() can free the domain's internal data\nbefore the deferred free_irq() for IRQs still mapped into it has run.\nWhen devres later processes that deferred cleanup, it can end up\ndereferencing the already-freed domain.\n\nFree each event IRQ explicitly with devm_free_irq() before removing\nthe domain. This triggers the free immediately and removes the IRQ\nfrom the devres tracking list, so devres will not attempt to free it\na second time later.\n\nAlso dispose of the event, INTx, and MSI IRQ mappings with\nirq_dispose_mapping() before their owning domains are removed.\n\nFinally, guard the calls to irq_set_chained_handler_and_data() for\npcie->irq, pcie->msi_irq, and pcie->intx_irq so they only run when\nthose fields hold a valid (>0) IRQ number.\n\nThis is a pre-existing issue, flagged by automated review during work\non an earlier, unrelated patch to this driver.\n\nBuild-tested and boot-tested on StarFive VisionFive v1.2A board\n\n## Affected\n\n- `Linux >= 76c9113968079140cb2f885631db422170f32105 < 1d0159e139261996a3ca21798d9114aab2124d3c`\n- `Linux >= 76c9113968079140cb2f885631db422170f32105 < 01c2f0c66bd1f892db9c6e82976da6b463cc4427`\n- `Linux >= 76c9113968079140cb2f885631db422170f32105 < e3589ca5f2e6477774753a2202c21509428d4701`\n- `Linux >= 76c9113968079140cb2f885631db422170f32105 < 26b73bae01d6eb81a4a38f36101812f20b2639de`\n- `Linux 6.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89455.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":206993,"id":"CVE-2026-89455","ts":1789749735801,"field":"cvss","old":"4.1","new":"5.5"},{"seq":204033,"id":"CVE-2026-89455","ts":1789490231132,"field":"cvss","old":null,"new":"4.1"},{"seq":204032,"id":"CVE-2026-89455","ts":1789490231132,"field":"severity","old":"none","new":"medium"},{"seq":147484,"id":"CVE-2026-89455","ts":1789270211090,"field":"cvss","old":null,"new":"4.1"},{"seq":147483,"id":"CVE-2026-89455","ts":1789270211090,"field":"severity","old":"none","new":"medium"},{"seq":109234,"id":"CVE-2026-89455","ts":1789183731082,"field":"cvss","old":null,"new":"4.1"},{"seq":109233,"id":"CVE-2026-89455","ts":1789183731082,"field":"severity","old":"none","new":"medium"}]}