{"id":"CVE-2026-89589","revision":"e40dd532bafb44bd98567579c95cbf42","records":[{"revision":"e40dd532bafb44bd98567579c95cbf42","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89589","aliases":[],"title":"acpi/apei/ghes: Use raw_spinlock_t for CXL CPER work locks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nacpi/apei/ghes: Use raw_spinlock_t for CXL CPER work locks\n\nThe CXL CPER work registration and unregistration helpers acquire\ncxl_cper_work_lock and cxl_cper_prot_err_work_lock with a spinlock\nguard(), which leaves local interrupts enabled. The corresponding post\npaths (cxl_cper_post_event(), cxl_cper_post_prot_err()) execute in hard\nIRQ context (they are called from the GHES error notification path) and\nacquire the same locks with an irqsave guard().\n\nIf a CPU is holding one of these locks via a spinlock guard() when a GHES\ninterrupt arrives on the same CPU, the IRQ handler spins on the held lock\nwaiting for it to release, while the lock holder is preempted by the IRQ.\nThe result is a deadlock.\n\nConvert both locks from spinlock_t to raw_spinlock_t and use guard() at\nall call sites. On PREEMPT_RT kernels spinlock_t is backed by rt_mutex and\nsleeping from hard IRQ context is not permitted; raw_spinlock_t is safe in\nboth contexts.\n\nAdd WARN_ONCE to both register functions to surface double-registration\nbugs at runtime.\n\nRestructure both unregister functions to clear the global work pointer\nunder the lock before calling cancel_work_sync(), closing the window\nwhere a CPER interrupt could schedule work on a pointer about to be\nfreed. Add kfifo_reset() after cancel_work_sync() so stale entries\nare not replayed on next module load.\n\nBoth kfifos are single-consumer: only one work_struct is registered at\na time, enforced by the WARN_ONCE guard in the register functions.\nkfifo_reset() is safe outside the lock because cancel_work_sync() has\nalready quiesced the consumer, and no new consumer can register until\nthe current module exit completes and a fresh module init runs.\n\nRemove the redundant cancel_work_sync() call from cxl_ras_exit() and\ncxl_pci_driver_exit(). The CPER unregister functions now quiesce\nthe work internally.","state":0,"publishedAt":"2026-09-11T19:44:53.578+00:00","modifiedAt":"2026-10-19T08:49:21.919+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/acpi/apei/ghes.c\",\n                        \"drivers/cxl/core/ras.c\",\n                        \"drivers/cxl/pci.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487\",\n                            \"lessThan\": \"cbc27a4302a1feb0ff77c1755021837a738b0ce9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487\",\n                            \"lessThan\": \"c735dbce7ad03df708bf22ec964f67e43cbc823a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487\",\n                            \"lessThan\": \"0e25382b05de48d09b243d3d447d236a6d735bc2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5e4a264bf8b55d5a1b4c8cd96ac10b99f98d7487\",\n                            \"lessThan\": \"6625ca499c3131ef63be3215f8f942d7a097ea3a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/acpi/apei/ghes.c\",\n                        \"drivers/cxl/core/ras.c\",\n                        \"drivers/cxl/pci.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/cbc27a4302a1feb0ff77c1755021837a738b0ce9","https://git.kernel.org/stable/c/c735dbce7ad03df708bf22ec964f67e43cbc823a","https://git.kernel.org/stable/c/0e25382b05de48d09b243d3d447d236a6d735bc2","https://git.kernel.org/stable/c/6625ca499c3131ef63be3215f8f942d7a097ea3a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89589","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89589","identifiers":["CVE-2026-89589"]},"retained":false,"historicalAffected":[]}],"coverage":[]}