CVE-2025-39977
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-39977
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39977.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-39977
- Downstream
- Published
- 2025-10-15T07:55:58Z
- Modified
- 2025-10-18T08:05:11.795426Z
- Summary
- futex: Prevent use-after-free during requeue-PI
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
futex: Prevent use-after-free during requeue-PI
syzbot managed to trigger the following race:
T1 T2
futexwaitrequeuepi() futexdowait() schedule() futexrequeue() futexproxytrylockatomic() futexrequeuepiprepare() requeuepiwakefutex() futexrequeuepicomplete() /* preempt */
* timeout/ signal wakes T1 *futexrequeuepiwakeupsync() // QREQUEUEPILOCKED futexhashput() // back to userland, on stack futexq is garbage
/* back */ wake_up_state(q->task, TASK_NORMAL);In this scenario futexwaitrequeuepi() is able to leave without using futexq::lock_ptr for synchronization.
This can be prevented by reading futexq::task before updating the futexq::requeuestate. A reference on the taskstruct is not needed because requeuepiwakefutex() is invoked with a spinlockt held which implies a RCU read section.
Even if T1 terminates immediately after, the taskstruct will remain valid during T2's wakeupstate(). A READONCE on futexq::task before futexrequeuepicomplete() is enough because it ensures that the variable is read before the state is updated.
Read futex_q::task before updating the requeue state, use it for the following wakeup.
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/348736955ed6ca6e99ca24b93b1d3fbfe352c181
- https://git.kernel.org/stable/c/a170b9c0dde83312b8b58ccc91509c7c15711641
- https://git.kernel.org/stable/c/b549113738e8c751b613118032a724b772aa83f2
- https://git.kernel.org/stable/c/cb5d19a61274b51b49601214a87af573b43d60fa
- https://git.kernel.org/stable/c/d824b2dbdcfe3c390278dd9652ea526168ef6850
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
-
Introduced07d91ef510fb16a2e0ca7453222105835b7ba3b8Fixedcb5d19a61274b51b49601214a87af573b43d60fa
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced07d91ef510fb16a2e0ca7453222105835b7ba3b8Fixed348736955ed6ca6e99ca24b93b1d3fbfe352c181
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced07d91ef510fb16a2e0ca7453222105835b7ba3b8Fixeda170b9c0dde83312b8b58ccc91509c7c15711641
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced07d91ef510fb16a2e0ca7453222105835b7ba3b8Fixedd824b2dbdcfe3c390278dd9652ea526168ef6850
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced07d91ef510fb16a2e0ca7453222105835b7ba3b8Fixedb549113738e8c751b613118032a724b772aa83f2
Affected versions
v5.*
v5.14
v5.14-rc7
v5.15
v5.15-rc1
v5.15-rc2
v5.15-rc3
v5.15-rc4
v5.15-rc5
v5.15-rc6
v5.15-rc7
v5.16
v5.16-rc1
v5.16-rc2
v5.16-rc3
v5.16-rc4
v5.16-rc5
v5.16-rc6
v5.16-rc7
v5.16-rc8
v5.17
v5.17-rc1
v5.17-rc2
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.19
v5.19-rc1
v5.19-rc2
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8
v6.*
v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
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
v6.1.153
v6.1.154
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
v6.12.48
v6.12.49
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
v6.16.8
v6.16.9
v6.17-rc1
v6.17-rc2
v6.17-rc3
v6.17-rc4
v6.17-rc5
v6.17-rc6
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
v6.6.107
v6.6.108
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
[
{
"id": "CVE-2025-39977-16bb0a39",
"deprecated": false,
"target": {
"function": "requeue_pi_wake_futex",
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@d824b2dbdcfe3c390278dd9652ea526168ef6850",
"digest": {
"length": 351.0,
"function_hash": "79293099083029529895252991215709074157"
},
"signature_version": "v1",
"signature_type": "Function"
},
{
"id": "CVE-2025-39977-6917c837",
"deprecated": false,
"target": {
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cb5d19a61274b51b49601214a87af573b43d60fa",
"digest": {
"line_hashes": [
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"273360076791450319684836368070150166545",
"80015738351317566738820245627168470032",
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"295626471960879843613400460783735163366",
"242468682264243299749163247838621798631"
],
"threshold": 0.9
},
"signature_version": "v1",
"signature_type": "Line"
},
{
"id": "CVE-2025-39977-76d5b40e",
"deprecated": false,
"target": {
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@d824b2dbdcfe3c390278dd9652ea526168ef6850",
"digest": {
"line_hashes": [
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"80898422298175794301024613479299516607",
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"334285480943938167583713032450922375393",
"330046207925245700519682419748353699138",
"1036084545073754887403113089404087048",
"339075914011019731959836251670738073471",
"295626471960879843613400460783735163366",
"242468682264243299749163247838621798631"
],
"threshold": 0.9
},
"signature_version": "v1",
"signature_type": "Line"
},
{
"id": "CVE-2025-39977-77b6347c",
"deprecated": false,
"target": {
"function": "requeue_pi_wake_futex",
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a170b9c0dde83312b8b58ccc91509c7c15711641",
"digest": {
"length": 300.0,
"function_hash": "20594351922312143593715492055036795886"
},
"signature_version": "v1",
"signature_type": "Function"
},
{
"id": "CVE-2025-39977-8b71d60d",
"deprecated": false,
"target": {
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@a170b9c0dde83312b8b58ccc91509c7c15711641",
"digest": {
"line_hashes": [
"160213375841278904612831132543741570845",
"228504553634408485002406459562692114129",
"80898422298175794301024613479299516607",
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"119383389621903115740750415748012411947",
"273360076791450319684836368070150166545",
"80015738351317566738820245627168470032",
"339075914011019731959836251670738073471",
"295626471960879843613400460783735163366",
"242468682264243299749163247838621798631"
],
"threshold": 0.9
},
"signature_version": "v1",
"signature_type": "Line"
},
{
"id": "CVE-2025-39977-ab24dbee",
"deprecated": false,
"target": {
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@348736955ed6ca6e99ca24b93b1d3fbfe352c181",
"digest": {
"line_hashes": [
"160213375841278904612831132543741570845",
"228504553634408485002406459562692114129",
"80898422298175794301024613479299516607",
"277418175906165590123758266307717146104",
"119383389621903115740750415748012411947",
"273360076791450319684836368070150166545",
"80015738351317566738820245627168470032",
"339075914011019731959836251670738073471",
"295626471960879843613400460783735163366",
"242468682264243299749163247838621798631"
],
"threshold": 0.9
},
"signature_version": "v1",
"signature_type": "Line"
},
{
"id": "CVE-2025-39977-cff41d8b",
"deprecated": false,
"target": {
"function": "requeue_pi_wake_futex",
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@b549113738e8c751b613118032a724b772aa83f2",
"digest": {
"length": 351.0,
"function_hash": "79293099083029529895252991215709074157"
},
"signature_version": "v1",
"signature_type": "Function"
},
{
"id": "CVE-2025-39977-db1b29b8",
"deprecated": false,
"target": {
"function": "requeue_pi_wake_futex",
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@cb5d19a61274b51b49601214a87af573b43d60fa",
"digest": {
"length": 300.0,
"function_hash": "20594351922312143593715492055036795886"
},
"signature_version": "v1",
"signature_type": "Function"
},
{
"id": "CVE-2025-39977-e60cc3de",
"deprecated": false,
"target": {
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@b549113738e8c751b613118032a724b772aa83f2",
"digest": {
"line_hashes": [
"160213375841278904612831132543741570845",
"228504553634408485002406459562692114129",
"80898422298175794301024613479299516607",
"277418175906165590123758266307717146104",
"334285480943938167583713032450922375393",
"330046207925245700519682419748353699138",
"1036084545073754887403113089404087048",
"339075914011019731959836251670738073471",
"295626471960879843613400460783735163366",
"242468682264243299749163247838621798631"
],
"threshold": 0.9
},
"signature_version": "v1",
"signature_type": "Line"
},
{
"id": "CVE-2025-39977-ec4c4a14",
"deprecated": false,
"target": {
"function": "requeue_pi_wake_futex",
"file": "kernel/futex/requeue.c"
},
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@348736955ed6ca6e99ca24b93b1d3fbfe352c181",
"digest": {
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},
"signature_version": "v1",
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}
]