{"id":"DEBIAN-CVE-2026-45904","details":"In the Linux kernel, the following vulnerability has been resolved:  powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling  The recent commit 1010b4c012b0 (\"powerpc/eeh: Make EEH driver device hotplug safe\") restructured the EEH driver to improve synchronization with the PCI hotplug layer.  However, it inadvertently moved pci_lock_rescan_remove() outside its intended scope in eeh_handle_normal_event(), leading to broken PCI error reporting and improper EEH event triggering. Specifically, eeh_handle_normal_event() acquired pci_lock_rescan_remove() before calling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to acquire the same lock internally, causing nested locking and disrupting normal EEH event handling paths.  This patch adds a boolean parameter do_lock to _eeh_pe_bus_get(), with two public wrappers:     eeh_pe_bus_get() with locking enabled.     eeh_pe_bus_get_nolock() that skips locking.  Callers that already hold pci_lock_rescan_remove() now use eeh_pe_bus_get_nolock() to avoid recursive lock acquisition.  Additionally, pci_lock_rescan_remove() calls are restored to the correct position—after eeh_pe_bus_get() and immediately before iterating affected PEs and devices. This ensures EEH-triggered PCI removes occur under proper bus rescan locking without recursive lock contention.  The eeh_pe_loc_get() function has been split into two functions:     eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE.     eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location     code for given bus.  This resolves lockdep warnings such as: \u003csnip\u003e [   84.964298] [    T928] ============================================ [   84.964304] [    T928] WARNING: possible recursive locking detected [   84.964311] [    T928] 6.18.0-rc3 #51 Not tainted [   84.964315] [    T928] -------------------------------------------- [   84.964320] [    T928] eehd/928 is trying to acquire lock: [   84.964324] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40 [   84.964342] [    T928]                        but task is already holding lock: [   84.964347] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40 [   84.964357] [    T928]                        other info that might help us debug this: [   84.964363] [    T928]  Possible unsafe locking scenario:  [   84.964367] [    T928]        CPU0 [   84.964370] [    T928]        ---- [   84.964373] [    T928]   lock(pci_rescan_remove_lock); [   84.964378] [    T928]   lock(pci_rescan_remove_lock); [   84.964383] [    T928]                        *** DEADLOCK ***  [   84.964388] [    T928]  May be due to missing lock nesting notation  [   84.964393] [    T928] 1 lock held by eehd/928: [   84.964397] [    T928]  #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40 [   84.964408] [    T928]                        stack backtrace: [   84.964414] [    T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY [   84.964417] [    T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries [   84.964419] [    T928] Call Trace: [   84.964420] [    T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable) [   84.964424] [    T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440 [   84.964428] [    T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80 [   84.964431] [    T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410 [   84.964433] [    T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050 [   84.964436] [    T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40 [   84.964439] [    T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0 [   84.964442] [    T928] [c0000011a7157e50] [c00000 ---truncated---","modified":"2026-09-14T17:03:42.363926311Z","published":"2026-05-27T14:17:04.820Z","upstream":["CVE-2026-45904"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-45904"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.170-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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