CVE-2024-42126 (GCVE-0-2024-42126)

Vulnerability from cvelistv5 – Published: 2024-07-30 07:46 – Updated: 2025-11-03 22:01
VLAI?
Title
powerpc: Avoid nmi_enter/nmi_exit in real mode interrupt.
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: eb553f16973ade990d05946af9ae191394712c8a , < fb6675db04c4b79883373edc578d5df7bbc84848 (git)
Affected: eb553f16973ade990d05946af9ae191394712c8a , < e2afb26615adf6c3ceaaa7732aa839bcd587a057 (git)
Affected: eb553f16973ade990d05946af9ae191394712c8a , < 8d3f83dfb23674540c827a8d65fba20aa300b252 (git)
Affected: eb553f16973ade990d05946af9ae191394712c8a , < 0f37946c62c48a907625348cbc720a7a0c547d1e (git)
Affected: eb553f16973ade990d05946af9ae191394712c8a , < 2c78c9411e685dbc9eac8c2845111b03501975b8 (git)
Affected: eb553f16973ade990d05946af9ae191394712c8a , < 0db880fc865ffb522141ced4bfa66c12ab1fbb70 (git)
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    Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.224 , ≤ 5.10.* (semver)
Unaffected: 5.15.165 , ≤ 5.15.* (semver)
Unaffected: 6.1.98 , ≤ 6.1.* (semver)
Unaffected: 6.6.39 , ≤ 6.6.* (semver)
Unaffected: 6.9.9 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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