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CVE-2026-52905— mm/damon/core: disallow non-power of two min_region_sz on damon_start()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于damon_start()中未检查min_region_sz是否为2的幂，可能导致非对齐的DAMON区域地址范围。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux d8f867fa0825fb3e358457566d7326d8aab2406a< 1de2db19a6028abe7d905875922faef5b873de67 affected
d8f867fa0825fb3e358457566d7326d8aab2406a< 89b6226b6c2a4add3939f361653a47c212d6ab75 affected
d8f867fa0825fb3e358457566d7326d8aab2406a< 95093e5cb4c5b50a5b1a4b79f2942b62744bd66a affected
6.18 affected
< 6.18 unaffected
6.18.30≤ 6.18.* unaffected
7.0.4≤ 7.0.* unaffected
7.1≤ * unaffected
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I. Basic Information for CVE-2026-52905

Vulnerability Information
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Vulnerability Title
mm/damon/core: disallow non-power of two min_region_sz on damon_start()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: disallow non-power of two min_region_sz on damon_start() Commit d8f867fa0825 ("mm/damon: add damon_ctx->min_sz_region") introduced a bug that allows unaligned DAMON region address ranges. Commit c80f46ac228b ("mm/damon/core: disallow non-power of two min_region_sz") fixed it, but only for damon_commit_ctx() use case. Still, DAMON sysfs interface can emit non-power of two min_region_sz via damon_start(). Fix the path by adding the is_power_of_2() check on damon_start(). The issue was discovered by sashiko [1].
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于damon_start()中未检查min_region_sz是否为2的幂，可能导致非对齐的DAMON区域地址范围。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux d8f867fa0825fb3e358457566d7326d8aab2406a ~ 1de2db19a6028abe7d905875922faef5b873de67 -
Linux Linux 6.18 -

II. Public POCs for CVE-2026-52905

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III. Intelligence Information for CVE-2026-52905

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Patches & Fixes for CVE-2026-52905 (2)

Same Patch Batch · Linux · 2026-06-09 · 21 CVEs total

CVE-2026-46325 9.8 CRITICAL RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
CVE-2026-46316 9.3 CRITICAL KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry
CVE-2026-46317 8.8 HIGH KVM: arm64: Reassign nested_mmus array behind mmu_lock
CVE-2026-46326 8.4 HIGH iio: pressure: mprls0025pa: fix spi_transfer struct initialisation
CVE-2026-46332 8.0 HIGH greybus: gb-beagleplay: bound bootloader receive buffering
CVE-2026-52907 7.8 HIGH media: rockchip: rkcif: fix off by one bugs
CVE-2026-46330 7.8 HIGH Revert "net/smc: Introduce TCP ULP support"
CVE-2026-46319 7.8 HIGH net/sched: act_ct: Only release RCU read lock after ct_ft
CVE-2026-46327 7.8 HIGH dm: fix unlocked test for dm_suspended_md
CVE-2026-46324 7.8 HIGH netfilter: nf_tables: use list_del_rcu for netlink hooks
CVE-2026-46323 7.8 HIGH net: gro: don't merge zcopy skbs
CVE-2026-52906 7.7 HIGH 9p: fix access mode flags being ORed instead of replaced
CVE-2026-46320 7.4 HIGH tap: free page on error paths in tap_get_user_xdp()
CVE-2026-46328 7.3 HIGH apparmor: fix rlimit for posix cpu timers
CVE-2026-46322 7.1 HIGH tun: free page on build_skb failure in tun_xdp_one()
CVE-2026-46321 7.1 HIGH tun: free page on short-frame rejection in tun_xdp_one()
CVE-2026-46318 Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"
CVE-2026-46329 erofs: handle end of filesystem properly for file-backed mounts
CVE-2026-52904 drm/nouveau: fix nvkm_device leak on aperture removal failure
CVE-2026-46315 io_uring/waitid: clear waitid info before copying it to userspace

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52905

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