{"id":"CVE-2026-45904","summary":"powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling","details":"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\u003csnip\u003e\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---","modified":"2026-07-08T08:13:41.926210921Z","published":"2026-05-27T12:17:12.504Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45904.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6e6561231c6cfc32c5631aeecc0928ff2b14265c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/788dd28fd49610d6047cbb15dbf1186afffdfbaf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/815a8d2feb5615ae7f0b5befd206af0b0160614c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/87a1f93986aa1500b85aeff16b0b71c29ea116ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89810e2d80281d42f855fac813786758ee16e323"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b85ee287bfe52c6b2d9b41758b5e0d08679d5b39"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f49faa4a64f8ac0e38983e606075b25dfcfc9ad4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f8b16d5764ee1e78c1ef333017ad383ffe76fcdc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45904.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45904"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"502f08831a9afb72dc98a56ae6504da43e93b250"},{"fixed":"89810e2d80281d42f855fac813786758ee16e323"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f56e004b781719d8fdf6c9619b15caf2579bc1f2"},{"fixed":"788dd28fd49610d6047cbb15dbf1186afffdfbaf"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"59c6d3d81d42bf543c90597b4f38c53d6874c5a1"},{"fixed":"f49faa4a64f8ac0e38983e606075b25dfcfc9ad4"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a426e8a6ae161f51888585b065db0f8f93ab2e16"},{"fixed":"87a1f93986aa1500b85aeff16b0b71c29ea116ea"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d2c60a8a387e9fcc28447ef36c03f8e49fd052a6"},{"fixed":"f8b16d5764ee1e78c1ef333017ad383ffe76fcdc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1010b4c012b0d78dfb9d3132b49aa2ef024a07a7"},{"fixed":"6e6561231c6cfc32c5631aeecc0928ff2b14265c"},{"fixed":"b85ee287bfe52c6b2d9b41758b5e0d08679d5b39"},{"fixed":"815a8d2feb5615ae7f0b5befd206af0b0160614c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"d42bbd8f30ac38b1ce54715bf08ec3dac18d6b25"},{"last_affected":"19d5036e7ad766cf212aebec23b9f1d7924a62bc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.241"},{"fixed":"5.10.252"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.190"},{"fixed":"5.15.202"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.148"},{"fixed":"6.1.165"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.102"},{"fixed":"6.6.128"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.42"},{"fixed":"6.12.75"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.15.10"},{"fixed":"6.16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.16.1"},{"fixed":"6.17"}]}],"versions":["v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.10.245","v5.10.244","v5.10.243","v5.10.242","v5.10.241","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v5.15.194","v5.15.193","v5.15.192","v5.15.191","v5.15.190","v6.1.164","v6.1.163","v6.1.162","v6.1.161","v6.1.160","v6.1.159","v6.1.158","v6.1.157","v6.1.156","v6.1.155","v6.1.154","v6.1.153","v6.1.152","v6.1.151","v6.1.150","v6.1.149","v6.1.148","v6.6.127","v6.6.126","v6.6.125","v6.6.124","v6.6.123","v6.6.122","v6.6.121","v6.6.120","v6.6.119","v6.6.118","v6.6.117","v6.6.116","v6.6.115","v6.6.114","v6.6.113","v6.6.112","v6.6.111","v6.6.110","v6.6.109","v6.6.108","v6.6.107","v6.6.106","v6.6.105","v6.6.104","v6.6.103","v6.6.102","v6.12.74","v6.12.73","v6.12.72","v6.12.71","v6.12.70","v6.12.69","v6.12.68","v6.12.67","v6.12.66","v6.12.65","v6.12.64","v6.12.63","v6.12.62","v6.12.61","v6.12.60","v6.12.59","v6.12.58","v6.12.57","v6.12.56","v6.12.55","v6.12.54","v6.12.53","v6.12.52","v6.12.51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