CVE-2026-46035
published 2026-05-27CVE-2026-46035: In the Linux kernel, the following vulnerability has been resolved: mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP On UP…
high7
In the Linux kernel, the following vulnerability has been resolved:
mm/page_alloc: return NULL early from alloc_frozen_pages_nolock() in NMI on UP
On UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that
unconditionally succeeds even when the lock is already held. As a
result, alloc_frozen_pages_nolock() called from NMI context can
re-enter rmqueue() and acquire the zone lock that the interrupted
context is already holding, corrupting the freelists.
With CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with
the slub_kunit test module:
BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243
[...]
Call Trace:
dump_stack_lvl+0x3f/0x60
do_raw_spin_trylock+0x41/0x50
_raw_spin_trylock+0x24/0x50
rmqueue.isra.0+0x2a9/0xa70
get_page_from_freelist+0xeb/0x450
alloc_frozen_pages_nolock_noprof+0x111/0x1e0
allocate_slab+0x42a/0x500
___slab_alloc+0xa7/0x4c0
kmalloc_nolock_noprof+0x164/0x310
[...]
Fix this by returning NULL early when invoked from NMI on a UP kernel.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= d7242af8643409aae32243450341ef25b28d8a8c < 05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4 | 05b4ed8bef30bba4f559c8d835e2dd20c48cf8a4 |
| linux | linux | >= d7242af8643409aae32243450341ef25b28d8a8c < a6d57efeaae3f3b3656514f600eac96be713d90e | a6d57efeaae3f3b3656514f600eac96be713d90e |
| linux | linux | >= d7242af8643409aae32243450341ef25b28d8a8c < 620b46ed6ae17c8438d889c8c0cfddab36a1476c | 620b46ed6ae17c8438d889c8c0cfddab36a1476c |
| linux | linux_kernel | — | — |