PT-2026-61272 · Linux · Linux

CVE-2026-63955

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Publicado

2026-07-19

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Atualizado

2026-07-19

CVSS v3.1

7.5

Alta

VetorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
In the Linux kernel, the following vulnerability has been resolved:
mm/vmalloc: do not trigger BUG() on BH disabled context
get vm area node() currently triggers a BUG() if in interrupt() returns true. However, in interrupt() also reports true when BH are disabled.
The bridge code can call rhashtable lookup insert fast() with bottom halves disabled:
vlan add() -> br fdb add local() spin lock bh(&br->hash lock); <-- Disable BH -> fdb add local() -> fdb create() -> rhashtable lookup insert fast() -> kvmalloc() -> vmalloc() -> get vm area node() -> BUG ON(in interrupt()) spin unlock bh(&br->hash lock)
this triggers the BUG() despite the caller not being in NMI or hard IRQ context.
Replace the in interrupt() check with in nmi() || in hardirq().

Correção

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dbugs@ptsecurity.com

Identificadores relacionados

CVE-2026-63955

Produtos afetados

Linux