CVE-2026-68165
Description
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: validate ranges in damon_set_regions() DAMON core logic assumes zero length regions don't exist. However, a few DAMON API callers including DAMON_SYSFS, DAMON_RECLAIM and DAMON_LRU_SORT allow users to set empty monitoring target regions. This could result in WARN_ONCE() on CONFIG_DAMON_DEBUG_SANITY enabled kernel, and divide-by-zero from damon_merge_two_regions(). For example, the WANR_ONCE() can be triggered like below. # grep DAMON_DEBUG_SANITY /boot/config-$(uname -r) # CONFIG_DAMON_DEBUG_SANITY=y # damo start # cd /sys/kernel/mm/damon/admin/kdamonds/0 # echo 0 > contexts/0/targets/0/regions/0/start # echo 0 > contexts/0/targets/0/regions/0/end # echo commit > state # dmesg [....] [ 73.705780] ------------[ cut here ]------------ [ 73.707552] start 0 >= end 0 [ 73.708452] WARNING: mm/damon/core.c:359 at damon_new_region+0x6e/0x80, CPU#1: kdamond.0/758 [...] All DAMON API callers eventually use damon_set_regions() to setup the regions. Add the validation logic in the function.
How to fix
- Linux Linux71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b, b585facbafbb5cf117b37b1c75819ac046646c27, c927b73a5694c735314ea10e7c81c07f9bd51ad7, 4b6f1d6d5d07855bd1bb9e64922b049062138bfa, 43aaddd0fa92010a68adeda7744c7cf497a1c8e9, 1292c0ecb1caefb8ca064a3639d5673991e8810c or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 43b0536cb4710e7bb591edfda7e68a1c327a3409 ≤ v < 71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b, 43b0536cb4710e7bb591edfda7e68a1c327a3409 ≤ v < b585facbafbb5cf117b37b1c75819ac046646c27, 43b0536cb4710e7bb591edfda7e68a1c327a3409 ≤ v < c927b73a5694c735314ea10e7c81c07f9bd51ad7, 43b0536cb4710e7bb591edfda7e68a1c327a3409 ≤ v < 4b6f1d6d5d07855bd1bb9e64922b049062138bfa, 43b0536cb4710e7bb591edfda7e68a1c327a3409 ≤ v < 43aaddd0fa92010a68adeda7744c7cf497a1c8e9, 43b0536cb4710e7bb591edfda7e68a1c327a3409 ≤ v < 1292c0ecb1caefb8ca064a3639d5673991e8810c, 5.16 | 71cf8a3ee1c18cfa8b88cc14bac9c2f43dd29f9b, b585facbafbb5cf117b37b1c75819ac046646c27, c927b73a5694c735314ea10e7c81c07f9bd51ad7, 4b6f1d6d5d07855bd1bb9e64922b049062138bfa, 43aaddd0fa92010a68adeda7744c7cf497a1c8e9, 1292c0ecb1caefb8ca064a3639d5673991e8810c |
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