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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 5.5 Difficulty: Hard EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux eb553f16973ade990d05946af9ae191394712c8a< fb6675db04c4b79883373edc578d5df7bbc84848 affected
eb553f16973ade990d05946af9ae191394712c8a< e2afb26615adf6c3ceaaa7732aa839bcd587a057 affected
eb553f16973ade990d05946af9ae191394712c8a< 8d3f83dfb23674540c827a8d65fba20aa300b252 affected
eb553f16973ade990d05946af9ae191394712c8a< 0f37946c62c48a907625348cbc720a7a0c547d1e affected
eb553f16973ade990d05946af9ae191394712c8a< 2c78c9411e685dbc9eac8c2845111b03501975b8 affected
eb553f16973ade990d05946af9ae191394712c8a< 0db880fc865ffb522141ced4bfa66c12ab1fbb70 affected
5.10 affected
< 5.10 unaffected
… +6 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux eb553f16973ade990d05946af9ae191394712c8a ~ fb6675db04c4b79883373edc578d5df7bbc84848 -
Linux Linux 5.10 -

II. Public POCs for CVE-2024-42126

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III. Intelligence Information for CVE-2024-42126

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Other References for CVE-2024-42126 (6)

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

CVE-2024-42108 9.8 CRITICAL net: rswitch: Avoid use-after-free in rswitch_poll()
CVE-2024-42225 8.3 HIGH wifi: mt76: replace skb_put with skb_put_zero
CVE-2024-42120 7.8 HIGH drm/amd/display: Check pipe offset before setting vblank
CVE-2024-42115 7.8 HIGH jffs2: Fix potential illegal address access in jffs2_free_inode
CVE-2024-42112 7.8 HIGH net: txgbe: free isb resources at the right time
CVE-2024-42111 7.8 HIGH btrfs: always do the basic checks for btrfs_qgroup_inherit structure
CVE-2024-42117 7.8 HIGH drm/amd/display: ASSERT when failing to find index by plane/stream id
CVE-2024-42109 7.8 HIGH netfilter: nf_tables: unconditionally flush pending work before notifier
CVE-2024-42162 7.8 HIGH gve: Account for stopped queues when reading NIC stats
CVE-2024-42105 7.8 HIGH nilfs2: fix inode number range checks
CVE-2024-42104 7.8 HIGH nilfs2: add missing check for inode numbers on directory entries
CVE-2024-42103 7.8 HIGH btrfs: fix adding block group to a reclaim list and the unused list during reclaim
CVE-2024-42099 7.8 HIGH s390/dasd: Fix invalid dereferencing of indirect CCW data pointer
CVE-2024-42132 7.6 HIGH bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX
CVE-2024-42133 7.6 HIGH Bluetooth: Ignore too large handle values in BIG
CVE-2024-42152 7.5 HIGH nvmet: fix a possible leak when destroy a ctrl during qp establishment
CVE-2024-42110 7.5 HIGH net: ntb_netdev: Move ntb_netdev_rx_handler() to call netif_rx() from __netif_rx()
CVE-2024-42145 7.5 HIGH IB/core: Implement a limit on UMAD receive List
CVE-2024-42123 7.0 HIGH drm/amdgpu: fix double free err_addr pointer warnings
CVE-2024-42224 7.0 HIGH net: dsa: mv88e6xxx: Correct check for empty list

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-42126

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