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

AI Predicted 3.3 Difficulty: Moderate EPSS 0.15% · P5

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinuxd8f867fa0825fb3e358457566d7326d8aab2406a< 1de2db19a6028abe7d905875922faef5b873de67affected
d8f867fa0825fb3e358457566d7326d8aab2406a< 89b6226b6c2a4add3939f361653a47c212d6ab75affected
d8f867fa0825fb3e358457566d7326d8aab2406a< 95093e5cb4c5b50a5b1a4b79f2942b62744bd66aaffected
6.18affected
< 6.18unaffected
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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux d8f867fa0825fb3e358457566d7326d8aab2406a ~ 1de2db19a6028abe7d905875922faef5b873de67 -
LinuxLinux 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-2026-463259.8 CRITICALRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
CVE-2026-463169.3 CRITICALKVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry
CVE-2026-463178.8 HIGHKVM: arm64: Reassign nested_mmus array behind mmu_lock
CVE-2026-463268.4 HIGHiio: pressure: mprls0025pa: fix spi_transfer struct initialisation
CVE-2026-463328.0 HIGHgreybus: gb-beagleplay: bound bootloader receive buffering
CVE-2026-529077.8 HIGHmedia: rockchip: rkcif: fix off by one bugs
CVE-2026-463307.8 HIGHRevert "net/smc: Introduce TCP ULP support"
CVE-2026-463197.8 HIGHnet/sched: act_ct: Only release RCU read lock after ct_ft
CVE-2026-463277.8 HIGHdm: fix unlocked test for dm_suspended_md
CVE-2026-463247.8 HIGHnetfilter: nf_tables: use list_del_rcu for netlink hooks
CVE-2026-463237.8 HIGHnet: gro: don't merge zcopy skbs
CVE-2026-529067.7 HIGH9p: fix access mode flags being ORed instead of replaced
CVE-2026-463207.4 HIGHtap: free page on error paths in tap_get_user_xdp()
CVE-2026-463287.3 HIGHapparmor: fix rlimit for posix cpu timers
CVE-2026-463227.1 HIGHtun: free page on build_skb failure in tun_xdp_one()
CVE-2026-463217.1 HIGHtun: free page on short-frame rejection in tun_xdp_one()
CVE-2026-46318Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare"
CVE-2026-46329erofs: handle end of filesystem properly for file-backed mounts
CVE-2026-52904drm/nouveau: fix nvkm_device leak on aperture removal failure
CVE-2026-46315io_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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