CVE-2025-39881
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-39881
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39881.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-39881
- Downstream
- Related
- Published
- 2025-09-23T06:00:50Z
- Modified
- 2025-11-04T03:12:26.299508Z
- Summary
- kernfs: Fix UAF in polling when open file is released
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
kernfs: Fix UAF in polling when open file is released
A use-after-free (UAF) vulnerability was identified in the PSI (Pressure Stall Information) monitoring mechanism:
BUG: KASAN: slab-use-after-free in psitriggerpoll+0x3c/0x140 Read of size 8 at addr ffff3de3d50bd308 by task systemd/1
psitriggerpoll+0x3c/0x140 cgrouppressurepoll+0x70/0xa0 cgroupfilepoll+0x8c/0x100 kernfsfoppoll+0x11c/0x1c0 epitempoll.isra.0+0x188/0x2c0
Allocated by task 1: cgroupfileopen+0x88/0x388 kernfsfopopen+0x73c/0xaf0 dodentryopen+0x5fc/0x1200 vfsopen+0xa0/0x3f0 doopen+0x7e8/0xd08 pathopenat+0x2fc/0x6b0 dofilp_open+0x174/0x368
Freed by task 8462: cgroupfilerelease+0x130/0x1f8 kernfsdrainopenfiles+0x17c/0x440 kernfsdrain+0x2dc/0x360 kernfsshow+0x1b8/0x288 cgroupfileshow+0x150/0x268 cgrouppressurewrite+0x1dc/0x340 cgroupfile_write+0x274/0x548
Reproduction Steps: 1. Open test/cpu.pressure and establish epoll monitoring 2. Disable monitoring: echo 0 > test/cgroup.pressure 3. Re-enable monitoring: echo 1 > test/cgroup.pressure
The race condition occurs because: 1. When cgroup.pressure is disabled (echo 0 > cgroup.pressure), it: - Releases PSI triggers via cgroupfilerelease() - Frees of->priv through kernfsdrainopen_files() 2. While epoll still holds reference to the file and continues polling 3. Re-enabling (echo 1 > cgroup.pressure) accesses freed of->priv
epolling disable/enable cgroup.pressure fd=open(cpu.pressure) while(1) ... epollwait kernfsfoppoll kernfsgetactive = true echo 0 > cgroup.pressure ... cgroupfileshow kernfsshow // inactive kn kernfsdrainopenfiles cft->release(of); kfree(ctx); ... kernfsgetactive = false echo 1 > cgroup.pressure kernfsshow kernfsactivateone(kn); kernfsfoppoll kernfsgetactive = true cgroupfilepoll psitriggerpoll // UAF ... end: close(fd)
To address this issue, introduce kernfsgetactiveof() for kernfs open files to obtain active references. This function will fail if the open file has been released. Replace kernfsgetactive() with kernfsgetactiveof() to prevent further operations on released file descriptors.
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/34d9cafd469c69ad85e6a36b4303c78382cf5c79
- https://git.kernel.org/stable/c/3c9ba2777d6c86025e1ba4186dc5cd930e40ec5f
- https://git.kernel.org/stable/c/7e64474aba78d240f7804f48f2d454dcca78b15f
- https://git.kernel.org/stable/c/854baafc00c433cccbe0ab4231b77aeb9b637b77
- https://git.kernel.org/stable/c/ac5cda4fae8818cf1963317bb699f7f2f85b60af
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced34f26a15611afb03c33df6819359d36f5b382589Fixed34d9cafd469c69ad85e6a36b4303c78382cf5c79
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced34f26a15611afb03c33df6819359d36f5b382589Fixed854baafc00c433cccbe0ab4231b77aeb9b637b77
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced34f26a15611afb03c33df6819359d36f5b382589Fixed7e64474aba78d240f7804f48f2d454dcca78b15f
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced34f26a15611afb03c33df6819359d36f5b382589Fixedac5cda4fae8818cf1963317bb699f7f2f85b60af
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced34f26a15611afb03c33df6819359d36f5b382589Fixed3c9ba2777d6c86025e1ba4186dc5cd930e40ec5f
Affected versions
v6.*
v6.0
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.1
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.1.1
v6.1.10
v6.1.100
v6.1.101
v6.1.102
v6.1.103
v6.1.104
v6.1.105
v6.1.106
v6.1.107
v6.1.108
v6.1.109
v6.1.11
v6.1.110
v6.1.111
v6.1.112
v6.1.113
v6.1.114
v6.1.115
v6.1.116
v6.1.117
v6.1.118
v6.1.119
v6.1.12
v6.1.120
v6.1.121
v6.1.122
v6.1.123
v6.1.124
v6.1.125
v6.1.126
v6.1.127
v6.1.128
v6.1.129
v6.1.13
v6.1.130
v6.1.131
v6.1.132
v6.1.133
v6.1.134
v6.1.135
v6.1.136
v6.1.137
v6.1.138
v6.1.139
v6.1.14
v6.1.140
v6.1.141
v6.1.142
v6.1.143
v6.1.144
v6.1.145
v6.1.146
v6.1.147
v6.1.148
v6.1.149
v6.1.15
v6.1.150
v6.1.151
v6.1.152
v6.1.16
v6.1.17
v6.1.18
v6.1.19
v6.1.2
v6.1.20
v6.1.21
v6.1.22
v6.1.23
v6.1.24
v6.1.25
v6.1.26
v6.1.27
v6.1.28
v6.1.29
v6.1.3
v6.1.30
v6.1.31
v6.1.32
v6.1.33
v6.1.34
v6.1.35
v6.1.36
v6.1.37
v6.1.38
v6.1.39
v6.1.4
v6.1.40
v6.1.41
v6.1.42
v6.1.43
v6.1.44
v6.1.45
v6.1.46
v6.1.47
v6.1.48
v6.1.49
v6.1.5
v6.1.50
v6.1.51
v6.1.52
v6.1.53
v6.1.54
v6.1.55
v6.1.56
v6.1.57
v6.1.58
v6.1.59
v6.1.6
v6.1.60
v6.1.61
v6.1.62
v6.1.63
v6.1.64
v6.1.65
v6.1.66
v6.1.67
v6.1.68
v6.1.69
v6.1.7
v6.1.70
v6.1.71
v6.1.72
v6.1.73
v6.1.74
v6.1.75
v6.1.76
v6.1.77
v6.1.78
v6.1.79
v6.1.8
v6.1.80
v6.1.81
v6.1.82
v6.1.83
v6.1.84
v6.1.85
v6.1.86
v6.1.87
v6.1.88
v6.1.89
v6.1.9
v6.1.90
v6.1.91
v6.1.92
v6.1.93
v6.1.94
v6.1.95
v6.1.96
v6.1.97
v6.1.98
v6.1.99
v6.10
v6.10-rc1
v6.10-rc2
v6.10-rc3
v6.10-rc4
v6.10-rc5
v6.10-rc6
v6.10-rc7
v6.11
v6.11-rc1
v6.11-rc2
v6.11-rc3
v6.11-rc4
v6.11-rc5
v6.11-rc6
v6.11-rc7
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.12.10
v6.12.11
v6.12.12
v6.12.13
v6.12.14
v6.12.15
v6.12.16
v6.12.17
v6.12.18
v6.12.19
v6.12.2
v6.12.20
v6.12.21
v6.12.22
v6.12.23
v6.12.24
v6.12.25
v6.12.26
v6.12.27
v6.12.28
v6.12.29
v6.12.3
v6.12.30
v6.12.31
v6.12.32
v6.12.33
v6.12.34
v6.12.35
v6.12.36
v6.12.37
v6.12.38
v6.12.39
v6.12.4
v6.12.40
v6.12.41
v6.12.42
v6.12.43
v6.12.44
v6.12.45
v6.12.46
v6.12.47
v6.12.5
v6.12.6
v6.12.7
v6.12.8
v6.12.9
v6.13
v6.13-rc1
v6.13-rc2
v6.13-rc3
v6.13-rc4
v6.13-rc5
v6.13-rc6
v6.13-rc7
v6.14
v6.14-rc1
v6.14-rc2
v6.14-rc3
v6.14-rc4
v6.14-rc5
v6.14-rc6
v6.14-rc7
v6.15
v6.15-rc1
v6.15-rc2
v6.15-rc3
v6.15-rc4
v6.15-rc5
v6.15-rc6
v6.15-rc7
v6.16
v6.16-rc1
v6.16-rc2
v6.16-rc3
v6.16-rc4
v6.16-rc5
v6.16-rc6
v6.16-rc7
v6.16.1
v6.16.2
v6.16.3
v6.16.4
v6.16.5
v6.16.6
v6.16.7
v6.17-rc1
v6.17-rc2
v6.17-rc3
v6.2
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6
v6.2-rc7
v6.2-rc8
v6.3
v6.3-rc1
v6.3-rc2
v6.3-rc3
v6.3-rc4
v6.3-rc5
v6.3-rc6
v6.3-rc7
v6.4
v6.4-rc1
v6.4-rc2
v6.4-rc3
v6.4-rc4
v6.4-rc5
v6.4-rc6
v6.4-rc7
v6.5
v6.5-rc1
v6.5-rc2
v6.5-rc3
v6.5-rc4
v6.5-rc5
v6.5-rc6
v6.5-rc7
v6.6
v6.6-rc1
v6.6-rc2
v6.6-rc3
v6.6-rc4
v6.6-rc5
v6.6-rc6
v6.6-rc7
v6.6.1
v6.6.10
v6.6.100
v6.6.101
v6.6.102
v6.6.103
v6.6.104
v6.6.105
v6.6.106
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.2
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.3
v6.6.30
v6.6.31
v6.6.32
v6.6.33
v6.6.34
v6.6.35
v6.6.36
v6.6.37
v6.6.38
v6.6.39
v6.6.4
v6.6.40
v6.6.41
v6.6.42
v6.6.43
v6.6.44
v6.6.45
v6.6.46
v6.6.47
v6.6.48
v6.6.49
v6.6.5
v6.6.50
v6.6.51
v6.6.52
v6.6.53
v6.6.54
v6.6.55
v6.6.56
v6.6.57
v6.6.58
v6.6.59
v6.6.6
v6.6.60
v6.6.61
v6.6.62
v6.6.63
v6.6.64
v6.6.65
v6.6.66
v6.6.67
v6.6.68
v6.6.69
v6.6.7
v6.6.70
v6.6.71
v6.6.72
v6.6.73
v6.6.74
v6.6.75
v6.6.76
v6.6.77
v6.6.78
v6.6.79
v6.6.8
v6.6.80
v6.6.81
v6.6.82
v6.6.83
v6.6.84
v6.6.85
v6.6.86
v6.6.87
v6.6.88
v6.6.89
v6.6.9
v6.6.90
v6.6.91
v6.6.92
v6.6.93
v6.6.94
v6.6.95
v6.6.96
v6.6.97
v6.6.98
v6.6.99
v6.7
v6.7-rc1
v6.7-rc2
v6.7-rc3
v6.7-rc4
v6.7-rc5
v6.7-rc6
v6.7-rc7
v6.7-rc8
v6.8
v6.8-rc1
v6.8-rc2
v6.8-rc3
v6.8-rc4
v6.8-rc5
v6.8-rc6
v6.8-rc7
v6.9
v6.9-rc1
v6.9-rc2
v6.9-rc3
v6.9-rc4
v6.9-rc5
v6.9-rc6
v6.9-rc7
Database specific
vanir_signatures
[
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@34d9cafd469c69ad85e6a36b4303c78382cf5c79",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "53612596741659719282552078234804111563",
"length": 439.0
},
"target": {
"function": "kernfs_vma_access",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-06084a15"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7e64474aba78d240f7804f48f2d454dcca78b15f",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "99635071145717469987078874485799790173",
"length": 270.0
},
"target": {
"function": "kernfs_vma_open",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-084c5d19"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@34d9cafd469c69ad85e6a36b4303c78382cf5c79",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "227752914849792824047635669604748630943",
"length": 221.0
},
"target": {
"function": "kernfs_seq_stop_active",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-1033205a"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@7e64474aba78d240f7804f48f2d454dcca78b15f",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "34024782152447975828815228483723568806",
"length": 390.0
},
"target": {
"function": "kernfs_vma_page_mkwrite",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-21610af6"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@ac5cda4fae8818cf1963317bb699f7f2f85b60af",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "2259729354723716176603184866282389205",
"length": 989.0
},
"target": {
"function": "kernfs_file_read_iter",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-222bd92e"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@34d9cafd469c69ad85e6a36b4303c78382cf5c79",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "99635071145717469987078874485799790173",
"length": 270.0
},
"target": {
"function": "kernfs_vma_open",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-2e0daf85"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@854baafc00c433cccbe0ab4231b77aeb9b637b77",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "16353630821259151283954114539093356004",
"length": 847.0
},
"target": {
"function": "kernfs_fop_mmap",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-34709915"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3c9ba2777d6c86025e1ba4186dc5cd930e40ec5f",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "216264352538095298711804054705509597694",
"length": 366.0
},
"target": {
"function": "kernfs_vma_fault",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-3977dca3"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3c9ba2777d6c86025e1ba4186dc5cd930e40ec5f",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "99635071145717469987078874485799790173",
"length": 270.0
},
"target": {
"function": "kernfs_vma_open",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-3bb02024"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@854baafc00c433cccbe0ab4231b77aeb9b637b77",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Function",
"digest": {
"function_hash": "216264352538095298711804054705509597694",
"length": 366.0
},
"target": {
"function": "kernfs_vma_fault",
"file": "fs/kernfs/file.c"
},
"id": "CVE-2025-39881-3c9909b9"
},
{
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@3c9ba2777d6c86025e1ba4186dc5cd930e40ec5f",
"deprecated": false,
"signature_version": "v1",
"signature_type": "Line",
"digest": {
"threshold": 0.9,
"line_hashes": [
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"170948989220569913972300231832288987810",
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"4693432967102722252596234931874713531",
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"161645997641085312051688969014582576351",
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"45604858432458171223762090398118917396",
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