{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-45904", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-45904", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-05-27T12:17:12.504Z", "updatedAt": "2026-05-27T12:17:12.504Z", "importedAt": "2026-10-24T01:58:14.884Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling\n\nThe recent commit 1010b4c012b0 (\"powerpc/eeh: Make EEH driver device\nhotplug safe\") restructured the EEH driver to improve synchronization\nwith the PCI hotplug layer.\n\nHowever, it inadvertently moved pci_lock_rescan_remove() outside its\nintended scope in eeh_handle_normal_event(), leading to broken PCI\nerror reporting and improper EEH event triggering. Specifically,\neeh_handle_normal_event() acquired pci_lock_rescan_remove() before\ncalling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to\nacquire the same lock internally, causing nested locking and disrupting\nnormal EEH event handling paths.\n\nThis patch adds a boolean parameter do_lock to _eeh_pe_bus_get(),\nwith two public wrappers:\n eeh_pe_bus_get() with locking enabled.\n eeh_pe_bus_get_nolock() that skips locking.\n\nCallers that already hold pci_lock_rescan_remove() now use\neeh_pe_bus_get_nolock() to avoid recursive lock acquisition.\n\nAdditionally, pci_lock_rescan_remove() calls are restored to the correct\nposition—after eeh_pe_bus_get() and immediately before iterating affected\nPEs and devices. This ensures EEH-triggered PCI removes occur under proper\nbus rescan locking without recursive lock contention.\n\nThe eeh_pe_loc_get() function has been split into two functions:\n eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE.\n eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location\n code for given bus.\n\nThis resolves lockdep warnings such as:\n\n[ 84.964298] [ T928] ============================================\n[ 84.964304] [ T928] WARNING: possible recursive locking detected\n[ 84.964311] [ T928] 6.18.0-rc3 #51 Not tainted\n[ 84.964315] [ T928] --------------------------------------------\n[ 84.964320] [ T928] eehd/928 is trying to acquire lock:\n[ 84.964324] [ T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[ 84.964342] [ T928]\n but task is already holding lock:\n[ 84.964347] [ T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[ 84.964357] [ T928]\n other info that might help us debug this:\n[ 84.964363] [ T928] Possible unsafe locking scenario:\n\n[ 84.964367] [ T928] CPU0\n[ 84.964370] [ T928] ----\n[ 84.964373] [ T928] lock(pci_rescan_remove_lock);\n[ 84.964378] [ T928] lock(pci_rescan_remove_lock);\n[ 84.964383] [ T928]\n *** DEADLOCK ***\n\n[ 84.964388] [ T928] May be due to missing lock nesting notation\n\n[ 84.964393] [ T928] 1 lock held by eehd/928:\n[ 84.964397] [ T928] #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[ 84.964408] [ T928]\n stack backtrace:\n[ 84.964414] [ T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY\n[ 84.964417] [ T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries\n[ 84.964419] [ T928] Call Trace:\n[ 84.964420] [ T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable)\n[ 84.964424] [ T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440\n[ 84.964428] [ T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80\n[ 84.964431] [ T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410\n[ 84.964433] [ T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050\n[ 84.964436] [ T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40\n[ 84.964439] [ T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0\n[ 84.964442] [ T928] [c0000011a7157e50] [c00000\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "502f08831a9afb72dc98a56ae6504da43e93b250", "status": "affected", "versionType": "git", "lessThan": "89810e2d80281d42f855fac813786758ee16e323" }, { "version": "f56e004b781719d8fdf6c9619b15caf2579bc1f2", "status": "affected", "versionType": "git", "lessThan": "788dd28fd49610d6047cbb15dbf1186afffdfbaf" }, { "version": "59c6d3d81d42bf543c90597b4f38c53d6874c5a1", "status": "affected", "versionType": "git", "lessThan": "f49faa4a64f8ac0e38983e606075b25dfcfc9ad4" }, { "version": "a426e8a6ae161f51888585b065db0f8f93ab2e16", "status": "affected", "versionType": "git", "lessThan": "87a1f93986aa1500b85aeff16b0b71c29ea116ea" }, { "version": "d2c60a8a387e9fcc28447ef36c03f8e49fd052a6", "status": "affected", "versionType": "git", "lessThan": "f8b16d5764ee1e78c1ef333017ad383ffe76fcdc" }, { "version": "1010b4c012b0d78dfb9d3132b49aa2ef024a07a7", "status": "affected", "versionType": "git", "lessThan": "6e6561231c6cfc32c5631aeecc0928ff2b14265c" }, { "version": "1010b4c012b0d78dfb9d3132b49aa2ef024a07a7", "status": "affected", "versionType": "git", "lessThan": "b85ee287bfe52c6b2d9b41758b5e0d08679d5b39" }, { "version": "1010b4c012b0d78dfb9d3132b49aa2ef024a07a7", "status": "affected", "versionType": "git", "lessThan": "815a8d2feb5615ae7f0b5befd206af0b0160614c" }, { "version": "d42bbd8f30ac38b1ce54715bf08ec3dac18d6b25", "status": "affected", "versionType": "git" }, { "version": "19d5036e7ad766cf212aebec23b9f1d7924a62bc", "status": "affected", "versionType": "git" }, { "version": "5.10.241", "status": "affected", "versionType": "semver", "lessThan": "5.10.252" }, { "version": "5.15.190", "status": "affected", "versionType": "semver", "lessThan": "5.15.202" }, { "version": "6.1.148", "status": "affected", "versionType": "semver", "lessThan": "6.1.165" }, { "version": "6.6.102", "status": "affected", "versionType": "semver", "lessThan": "6.6.128" }, { "version": "6.12.42", "status": "affected", "versionType": "semver", "lessThan": "6.12.75" }, { "version": "6.15.10", "status": "affected", "versionType": "semver", "lessThan": "6.16" }, { "version": "6.16.1", "status": "affected", "versionType": "semver", "lessThan": "6.17" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.17" }, { "version": "5.10.252", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.202", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.165", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.128", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.75", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.14", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }