CVE-2026-45904
Estado: En análisisMedia (5.5)—
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.
Leer descripción completaMostrar menos
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.
Detalles técnicos trazas, registros y código del informe original
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.
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:
<snip>
[ 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---CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-674
Referencias
- https://git.kernel.org/stable/c/6e6561231c6cfc32c5631aeecc0928ff2b14265c
- https://git.kernel.org/stable/c/788dd28fd49610d6047cbb15dbf1186afffdfbaf
- https://git.kernel.org/stable/c/815a8d2feb5615ae7f0b5befd206af0b0160614c
- https://git.kernel.org/stable/c/87a1f93986aa1500b85aeff16b0b71c29ea116ea
- https://git.kernel.org/stable/c/89810e2d80281d42f855fac813786758ee16e323
- https://git.kernel.org/stable/c/b85ee287bfe52c6b2d9b41758b5e0d08679d5b39
- https://git.kernel.org/stable/c/f49faa4a64f8ac0e38983e606075b25dfcfc9ad4
- https://git.kernel.org/stable/c/f8b16d5764ee1e78c1ef333017ad383ffe76fcdc
JSON original (NVD)
Mostrar
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"description": [
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"descriptions": [
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"lang": "en",
"value": "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<snip>\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---"
}
],
"lastModified": "2026-06-24T16:28:46.760",
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