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Tracker / CVE-2022-50206

CVE-2022-50206

Media 5.5

In the Linux kernel, the following vulnerability has been resolved: arm64: fix oops in concurrently setting insn_emulation sysctls emulation_proc_handler() changes table->data for proc_dointvec_minmax and can generate the following Oops if called concurrently with itself: | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 | Internal error: Oops: 96000006 [#1] SMP | Call trace: | update_insn_emulation_mode+0xc0/0x148 | emulation_proc_handler+0x64/0xb8 | proc_sys_call_handler+0x9c/0xf8 | proc_sys_write+0x18/0x20 | __vfs_write+0x20/0x48 | vfs_write+0xe4/0x1d0 | ksys_write+0x70/0xf8 | __arm64_sys_write+0x20/0x28 | el0_svc_common.constprop.0+0x7c/0x1c0 | el0_svc_handler+0x2c/0xa0 | el0_svc+0x8/0x200 To fix this issue, keep the table->data as &insn->current_mode and use container_of() to retrieve the insn pointer. Another mutex is used to protect against the current_mode update but not for retrieving insn_emulation as table->data is no longer changing.

Prodotti e versioni affette

linux linux_kernel · … → 4.14.291
linux linux_kernel · 4.15 → 4.19.256
linux linux_kernel · 4.20 → 5.4.211
linux linux_kernel · 5.11 → 5.15.61
linux linux_kernel · 5.16 → 5.18.18
linux linux_kernel · 5.19 → 5.19.2
linux linux_kernel · 5.5 → 5.10.137

Analisi

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Riferimenti