CVE-2025-39843
published 2025-09-19CVE-2025-39843: In the Linux kernel, the following vulnerability has been resolved: mm: slub: avoid wake up kswapd in set_track_prepare set_track_prepare() can incur lock…
medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
In the Linux kernel, the following vulnerability has been resolved:
mm: slub: avoid wake up kswapd in set_track_prepare
set_track_prepare() can incur lock recursion.
The issue is that it is called from hrtimer_start_range_ns
holding the per_cpu(hrtimer_bases)[n].lock, but when enabled
CONFIG_DEBUG_OBJECTS_TIMERS, may wake up kswapd in set_track_prepare,
and try to hold the per_cpu(hrtimer_bases)[n].lock.
Avoid deadlock caused by implicitly waking up kswapd by passing in
allocation flags, which do not contain __GFP_KSWAPD_RECLAIM in the
debug_objects_fill_pool() case. Inside stack depot they are processed by
gfp_nested_mask().
Since ___slab_alloc() has preemption disabled, we mask out
__GFP_DIRECT_RECLAIM from the flags there.
The oops looks something like:
BUG: spinlock recursion on CPU#3, swapper/3/0
lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .owner_cpu: 3
Hardware name: Qualcomm Technologies, Inc. Popsicle based on SM8850 (DT)
Call trace:
spin_bug+0x0
_raw_spin_lock_irqsave+0x80
hrtimer_try_to_cancel+0x94
task_contending+0x10c
enqueue_dl_entity+0x2a4
dl_server_start+0x74
enqueue_task_fair+0x568
enqueue_task+0xac
do_activate_task+0x14c
ttwu_do_activate+0xcc
try_to_wake_up+0x6c8
default_wake_function+0x20
autoremove_wake_function+0x1c
__wake_up+0xac
wakeup_kswapd+0x19c
wake_all_kswapds+0x78
__alloc_pages_slowpath+0x1ac
__alloc_pages_noprof+0x298
stack_depot_save_flags+0x6b0
stack_depot_save+0x14
set_track_prepare+0x5c
___slab_alloc+0xccc
__kmalloc_cache_noprof+0x470
__set_page_owner+0x2bc
post_alloc_hook[jt]+0x1b8
prep_new_page+0x28
get_page_from_freelist+0x1edc
__alloc_pages_noprof+0x13c
alloc_slab_page+0x244
allocate_slab+0x7c
___slab_alloc+0x8e8
kmem_cache_alloc_noprof+0x450
debug_objects_fill_pool+0x22c
debug_object_activate+0x40
enqueue_hrtimer[jt]+0xdc
hrtimer_start_range_ns+0x5f8
...
Affected
20 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 5cf909c553e9efed573811de4b3f5172898d5515 < 994b03b9605d36d814c611385fbf90ca6db20aa8 | 994b03b9605d36d814c611385fbf90ca6db20aa8 |
| linux | linux | >= 5cf909c553e9efed573811de4b3f5172898d5515 < 522ffe298627cfe72539d72167c2e20e72b5e856 | 522ffe298627cfe72539d72167c2e20e72b5e856 |
| linux | linux | >= 5cf909c553e9efed573811de4b3f5172898d5515 < 243b705a90ed8449f561a271cf251fd2e939f3db | 243b705a90ed8449f561a271cf251fd2e939f3db |
| linux | linux | >= 5cf909c553e9efed573811de4b3f5172898d5515 < eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab | eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab |
| linux | linux | >= 5cf909c553e9efed573811de4b3f5172898d5515 < 850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f | 850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.1.153-1 | 6.1.153-1 |
| linux | linux_kernel | >= 0 < 6.12.48-1 | 6.12.48-1 |
| linux | linux_kernel | >= 0 < 6.16.6-1 | 6.16.6-1 |
| linux | linux_kernel | >= 0 < 6.8.0-106.106 | 6.8.0-106.106 |
| linux | linux_kernel | >= 5.19 < 6.1.151 | 6.1.151 |
| linux | linux_kernel | >= 6.13 < 6.16.6 | 6.16.6 |
| linux | linux_kernel | >= 6.2 < 6.6.105 | 6.6.105 |
| linux | linux_kernel | >= 6.7 < 6.12.46 | 6.12.46 |
| msrc | azl3_kernel_6.6.96.2-2_on_azure_linux_3.0 | — | — |
| ubuntu | linux-xilinx | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM