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CVE-2024-42126— powerpc: Avoid nmi_enter/nmi_exit in real mode interrupt.

EPSS 0.01% · P2
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I. Basic Information for CVE-2024-42126

Vulnerability Information
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Vulnerability Title
powerpc: Avoid nmi_enter/nmi_exit in real mode interrupt.
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: powerpc: Avoid nmi_enter/nmi_exit in real mode interrupt. nmi_enter()/nmi_exit() touches per cpu variables which can lead to kernel crash when invoked during real mode interrupt handling (e.g. early HMI/MCE interrupt handler) if percpu allocation comes from vmalloc area. Early HMI/MCE handlers are called through DEFINE_INTERRUPT_HANDLER_NMI() wrapper which invokes nmi_enter/nmi_exit calls. We don't see any issue when percpu allocation is from the embedded first chunk. However with CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK enabled there are chances where percpu allocation can come from the vmalloc area. With kernel command line "percpu_alloc=page" we can force percpu allocation to come from vmalloc area and can see kernel crash in machine_check_early: [ 1.215714] NIP [c000000000e49eb4] rcu_nmi_enter+0x24/0x110 [ 1.215717] LR [c0000000000461a0] machine_check_early+0xf0/0x2c0 [ 1.215719] --- interrupt: 200 [ 1.215720] [c000000fffd73180] [0000000000000000] 0x0 (unreliable) [ 1.215722] [c000000fffd731b0] [0000000000000000] 0x0 [ 1.215724] [c000000fffd73210] [c000000000008364] machine_check_early_common+0x134/0x1f8 Fix this by avoiding use of nmi_enter()/nmi_exit() in real mode if percpu first chunk is not embedded.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于powerpc模块中在处理实时模式中断时使用nmi_enter()/nmi_exit()，如果percpu分配来自vmalloc区域，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux eb553f16973ade990d05946af9ae191394712c8a ~ fb6675db04c4b79883373edc578d5df7bbc84848 -
LinuxLinux 5.10 -

II. Public POCs for CVE-2024-42126

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III. Intelligence Information for CVE-2024-42126

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Same Patch Batch · Linux · 2024-07-30 · 70 CVEs total

CVE-2024-42146drm/xe: Add outer runtime_pm protection to xe_live_ktest@xe_dma_buf
CVE-2024-42227drm/amd/display: Fix overlapping copy within dml_core_mode_programming
CVE-2024-42225wifi: mt76: replace skb_put with skb_put_zero
CVE-2024-42153i2c: pnx: Fix potential deadlock warning from del_timer_sync() call in isr
CVE-2024-42152nvmet: fix a possible leak when destroy a ctrl during qp establishment
CVE-2024-42151bpf: mark bpf_dummy_struct_ops.test_1 parameter as nullable
CVE-2024-42150net: txgbe: remove separate irq request for MSI and INTx
CVE-2024-42149fs: don't misleadingly warn during thaw operations
CVE-2024-42148bnx2x: Fix multiple UBSAN array-index-out-of-bounds
CVE-2024-42147crypto: hisilicon/debugfs - Fix debugfs uninit process issue
CVE-2024-42154tcp_metrics: validate source addr length
CVE-2024-42145IB/core: Implement a limit on UMAD receive List
CVE-2024-42144thermal/drivers/mediatek/lvts_thermal: Check NULL ptr on lvts_data
CVE-2024-42142net/mlx5: E-switch, Create ingress ACL when needed
CVE-2024-42141Bluetooth: ISO: Check socket flag instead of hcon
CVE-2024-42140riscv: kexec: Avoid deadlock in kexec crash path
CVE-2024-42138mlxsw: core_linecards: Fix double memory deallocation in case of invalid INI file
CVE-2024-42139ice: Fix improper extts handling
CVE-2024-42137Bluetooth: qca: Fix BT enable failure again for QCA6390 after warm reboot
CVE-2024-42136cdrom: rearrange last_media_change check to avoid unintentional overflow

Showing top 20 of 70 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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