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CVE-2025-39877— mm/damon/sysfs: fix use-after-free in state_show()

EPSS 0.02% · P5

Affected Version Matrix 12

VendorProductVersion RangeStatus
LinuxLinuxa61ea561c87139992fe32afdee48a6f6b85d824a< 3858c44341ad49dc7544b19cc9f9ecffaa7cc50eaffected
a61ea561c87139992fe32afdee48a6f6b85d824a< 60d7a3d2b985a395318faa1d88da6915fad11c19affected
a61ea561c87139992fe32afdee48a6f6b85d824a< 26d29b2ac87a2989071755f9828ebf839b560d4caffected
a61ea561c87139992fe32afdee48a6f6b85d824a< 4e87f461d61959647464a94d11ae15c011be58ceaffected
a61ea561c87139992fe32afdee48a6f6b85d824a< 3260a3f0828e06f5f13fac69fb1999a6d60d9cffaffected
5.18affected
< 5.18unaffected
6.1.153≤ 6.1.*unaffected
… +4 more rows
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I. Basic Information for CVE-2025-39877

Vulnerability Information
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Vulnerability Title
mm/damon/sysfs: fix use-after-free in state_show()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs: fix use-after-free in state_show() state_show() reads kdamond->damon_ctx without holding damon_sysfs_lock. This allows a use-after-free race: CPU 0 CPU 1 ----- ----- state_show() damon_sysfs_turn_damon_on() ctx = kdamond->damon_ctx; mutex_lock(&damon_sysfs_lock); damon_destroy_ctx(kdamond->damon_ctx); kdamond->damon_ctx = NULL; mutex_unlock(&damon_sysfs_lock); damon_is_running(ctx); /* ctx is freed */ mutex_lock(&ctx->kdamond_lock); /* UAF */ (The race can also occur with damon_sysfs_kdamonds_rm_dirs() and damon_sysfs_kdamond_release(), which free or replace the context under damon_sysfs_lock.) Fix by taking damon_sysfs_lock before dereferencing the context, mirroring the locking used in pid_show(). The bug has existed since state_show() first accessed kdamond->damon_ctx.
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，该漏洞源于未正确获取damon_sysfs_lock锁，可能导致释放后重用。
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 a61ea561c87139992fe32afdee48a6f6b85d824a ~ 3858c44341ad49dc7544b19cc9f9ecffaa7cc50e -
LinuxLinux 5.18 -

II. Public POCs for CVE-2025-39877

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III. Intelligence Information for CVE-2025-39877

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Same Patch Batch · Linux · 2025-09-23 · 21 CVEs total

CVE-2025-39878ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error
CVE-2025-39887tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()
CVE-2025-39888fuse: Block access to folio overlimit
CVE-2025-39885ocfs2: fix recursive semaphore deadlock in fiemap call
CVE-2025-39886bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()
CVE-2025-39883mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
CVE-2025-39884btrfs: fix subvolume deletion lockup caused by inodes xarray race
CVE-2025-39882drm/mediatek: fix potential OF node use-after-free
CVE-2025-39880libceph: fix invalid accesses to ceph_connection_v1_info
CVE-2025-39881kernfs: Fix UAF in polling when open file is released
CVE-2025-39868erofs: fix runtime warning on truncate_folio_batch_exceptionals()
CVE-2025-39879ceph: always call ceph_shift_unused_folios_left()
CVE-2025-39876net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable()
CVE-2025-39874macsec: sync features on RTM_NEWLINK
CVE-2025-39875igb: Fix NULL pointer dereference in ethtool loopback test
CVE-2025-39873can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB
CVE-2025-39872hsr: hold rcu and dev lock for hsr_get_port_ndev
CVE-2025-39871dmaengine: idxd: Remove improper idxd_free
CVE-2025-39869dmaengine: ti: edma: Fix memory allocation size for queue_priority_map
CVE-2025-39870dmaengine: idxd: Fix double free in idxd_setup_wqs()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39877

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