CVE-2023-53326
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
powerpc: Don't try to copy PPR for task with NULL pt_regs
powerpc sets up PF_KTHREAD and PF_IO_WORKER with a NULL pt_regs, which from my (arguably very short) checking is not commonly done for other archs. This is fine, except when PF_IO_WORKER's have been created and the task does something that causes a coredump to be generated. Then we get this crash:
Because ppr_get() is trying to copy from a PF_IO_WORKER with a NULL pt_regs.
Check for a valid pt_regs in both ppc_get/ppr_set, and return an error if not set. The actual error value doesn't seem to be important here, so just pick -EINVAL.
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[mpe: Trim oops in change log, add Fixes & Cc stable]
Detalles técnicos trazas, registros y código del informe original
Kernel attempted to read user page (160) - exploit attempt? (uid: 1000)
BUG: Kernel NULL pointer dereference on read at 0x00000160
Faulting instruction address: 0xc0000000000c3a60
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=32 NUMA pSeries
Modules linked in: bochs drm_vram_helper drm_kms_helper xts binfmt_misc ecb ctr syscopyarea sysfillrect cbc sysimgblt drm_ttm_helper aes_generic ttm sg libaes evdev joydev virtio_balloon vmx_crypto gf128mul drm dm_mod fuse loop configfs drm_panel_orientation_quirks ip_tables x_tables autofs4 hid_generic usbhid hid xhci_pci xhci_hcd usbcore usb_common sd_mod
CPU: 1 PID: 1982 Comm: ppc-crash Not tainted 6.3.0-rc2+ #88
Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries
NIP: c0000000000c3a60 LR: c000000000039944 CTR: c0000000000398e0
REGS: c0000000041833b0 TRAP: 0300 Not tainted (6.3.0-rc2+)
MSR: 800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 88082828 XER: 200400f8
...
NIP memcpy_power7+0x200/0x7d0
LR ppr_get+0x64/0xb0
Call Trace:
ppr_get+0x40/0xb0 (unreliable)
__regset_get+0x180/0x1f0
regset_get_alloc+0x64/0x90
elf_core_dump+0xb98/0x1b60
do_coredump+0x1c34/0x24a0
get_signal+0x71c/0x1410
do_notify_resume+0x140/0x6f0
interrupt_exit_user_prepare_main+0x29c/0x320
interrupt_exit_user_prepare+0x6c/0xa0
interrupt_return_srr_user+0x8/0x138CVSS
- 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: 0.15%
- Percentil entre todas las CVEs puntuadas: 3
- Fecha de la puntuación: 6/10/2026
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-476
- CWE-476
Referencias
- https://git.kernel.org/stable/c/01849382373b867ddcbe7536b9dfa89f3bcea60e
- https://git.kernel.org/stable/c/064a1c7b0f8403260d77627e62424a72ca26cee2
- https://git.kernel.org/stable/c/7624973bc15b76d000e8e6f9b8080fcb76d36595
- https://git.kernel.org/stable/c/80a4200d51e5a7e046f4a90f5faa5bafd5a60c58
- https://git.kernel.org/stable/c/fd7276189450110ed835eb0a334e62d2f1c4e3be
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc: Don't try to copy PPR for task with NULL pt_regs\n\npowerpc sets up PF_KTHREAD and PF_IO_WORKER with a NULL pt_regs, which\nfrom my (arguably very short) checking is not commonly done for other\narchs. This is fine, except when PF_IO_WORKER's have been created and\nthe task does something that causes a coredump to be generated. Then we\nget this crash:\n\n Kernel attempted to read user page (160) - exploit attempt? (uid: 1000)\n BUG: Kernel NULL pointer dereference on read at 0x00000160\n Faulting instruction address: 0xc0000000000c3a60\n Oops: Kernel access of bad area, sig: 11 [#1]\n LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=32 NUMA pSeries\n Modules linked in: bochs drm_vram_helper drm_kms_helper xts binfmt_misc ecb ctr syscopyarea sysfillrect cbc sysimgblt drm_ttm_helper aes_generic ttm sg libaes evdev joydev virtio_balloon vmx_crypto gf128mul drm dm_mod fuse loop configfs drm_panel_orientation_quirks ip_tables x_tables autofs4 hid_generic usbhid hid xhci_pci xhci_hcd usbcore usb_common sd_mod\n CPU: 1 PID: 1982 Comm: ppc-crash Not tainted 6.3.0-rc2+ #88\n Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries\n NIP: c0000000000c3a60 LR: c000000000039944 CTR: c0000000000398e0\n REGS: c0000000041833b0 TRAP: 0300 Not tainted (6.3.0-rc2+)\n MSR: 800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 88082828 XER: 200400f8\n ...\n NIP memcpy_power7+0x200/0x7d0\n LR ppr_get+0x64/0xb0\n Call Trace:\n ppr_get+0x40/0xb0 (unreliable)\n __regset_get+0x180/0x1f0\n regset_get_alloc+0x64/0x90\n elf_core_dump+0xb98/0x1b60\n do_coredump+0x1c34/0x24a0\n get_signal+0x71c/0x1410\n do_notify_resume+0x140/0x6f0\n interrupt_exit_user_prepare_main+0x29c/0x320\n interrupt_exit_user_prepare+0x6c/0xa0\n interrupt_return_srr_user+0x8/0x138\n\nBecause ppr_get() is trying to copy from a PF_IO_WORKER with a NULL\npt_regs.\n\nCheck for a valid pt_regs in both ppc_get/ppr_set, and return an error\nif not set. The actual error value doesn't seem to be important here, so\njust pick -EINVAL.\n\n[mpe: Trim oops in change log, add Fixes & Cc stable]"
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"lastModified": "2026-06-17T06:44:53.877",
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