CVE-2025-39843

settrackprepare() can incur lock recursion. The issue is that it is called from hrtimerstartrangens holding the percpu(hrtimerbases)[n].lock, but when enabled CONFIGDEBUGOBJECTSTIMERS, may wake up kswapd in settrackprepare, and try to hold the percpu(hrtimerbases)[n].lock.

Avoid deadlock caused by implicitly waking up kswapd by passing in allocation flags, which do not contain GFPKSWAPDRECLAIM in the debugobjectsfillpool() case. Inside stack depot they are processed by gfpnestedmask(). Since _slaballoc() has preemption disabled, we mask out _GFPDIRECT_RECLAIM from the flags there.

The oops looks something like:

BUG: spinlock recursion on CPU#3, swapper/3/0 lock: 0xffffff8a4bf29c80, .magic: dead4ead, .owner: swapper/3/0, .ownercpu: 3 Hardware name: Qualcomm Technologies, Inc. Popsicle based on SM8850 (DT) Call trace: spinbug+0x0 rawspinlockirqsave+0x80 hrtimertrytocancel+0x94 taskcontending+0x10c enqueuedlentity+0x2a4 dlserverstart+0x74 enqueuetaskfair+0x568 enqueuetask+0xac doactivatetask+0x14c ttwudoactivate+0xcc trytowakeup+0x6c8 defaultwakefunction+0x20 autoremovewakefunction+0x1c wakeup+0xac wakeupkswapd+0x19c wakeallkswapds+0x78 _allocpagesslowpath+0x1ac _allocpagesnoprof+0x298 stackdepotsaveflags+0x6b0 stackdepotsave+0x14 settrackprepare+0x5c _slaballoc+0xccc kmalloccachenoprof+0x470 _setpageowner+0x2bc postallochook[jt]+0x1b8 prepnewpage+0x28 getpagefromfreelist+0x1edc _allocpagesnoprof+0x13c allocslabpage+0x244 allocateslab+0x7c slaballoc+0x8e8 kmemcacheallocnoprof+0x450 debugobjectsfillpool+0x22c debugobjectactivate+0x40 enqueuehrtimer[jt]+0xdc hrtimerstartrangens+0x5f8 ...

References

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: Introduced

5cf909c553e9efed573811de4b3f5172898d5515

Fixed

994b03b9605d36d814c611385fbf90ca6db20aa8

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

5cf909c553e9efed573811de4b3f5172898d5515

Fixed

522ffe298627cfe72539d72167c2e20e72b5e856

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

5cf909c553e9efed573811de4b3f5172898d5515

Fixed

243b705a90ed8449f561a271cf251fd2e939f3db

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

5cf909c553e9efed573811de4b3f5172898d5515

Fixed

eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab

Type: GIT
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events: Introduced

5cf909c553e9efed573811de4b3f5172898d5515

Fixed

850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f

Affected versions

v5.*

v5.18

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

v6.1.16

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

v6.12.5

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

v6.17-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

v6.6.11

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

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    {
        "deprecated": false,
        "target": {
            "file": "mm/slub.c",
            "function": "set_track_prepare"
        },
        "signature_type": "Function",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@522ffe298627cfe72539d72167c2e20e72b5e856",
        "id": "CVE-2025-39843-023e720b",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@994b03b9605d36d814c611385fbf90ca6db20aa8",
        "id": "CVE-2025-39843-2998c1fe",
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@243b705a90ed8449f561a271cf251fd2e939f3db",
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    },
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@243b705a90ed8449f561a271cf251fd2e939f3db",
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        "digest": {
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        },
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        "id": "CVE-2025-39843-4deeb8e9",
        "digest": {
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            "length": 4181.0
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    },
    {
        "deprecated": false,
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@243b705a90ed8449f561a271cf251fd2e939f3db",
        "id": "CVE-2025-39843-56964e54",
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    },
    {
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@522ffe298627cfe72539d72167c2e20e72b5e856",
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        "digest": {
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        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab",
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                "320858528116806760400721925549762577822",
                "286538829695105793622916324949901122932"
            ]
        }
    },
    {
        "deprecated": false,
        "target": {
            "file": "mm/slub.c",
            "function": "set_track_prepare"
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb3240ffd243bfb8b1e9dc568d484ecf9fd660ab",
        "id": "CVE-2025-39843-f057c1ed",
        "digest": {
            "function_hash": "115919629240849225481612365567303452811",
            "length": 53.0
        }
    },
    {
        "deprecated": false,
        "target": {
            "file": "mm/slub.c",
            "function": "set_track"
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@994b03b9605d36d814c611385fbf90ca6db20aa8",
        "id": "CVE-2025-39843-f860e1e2",
        "digest": {
            "function_hash": "149228926941445473559448599238666676564",
            "length": 174.0
        }
    },
    {
        "deprecated": false,
        "target": {
            "file": "mm/slub.c",
            "function": "free_to_partial_list"
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@994b03b9605d36d814c611385fbf90ca6db20aa8",
        "id": "CVE-2025-39843-fb173f93",
        "digest": {
            "function_hash": "65521522537101719395381291811935263181",
            "length": 1078.0
        }
    },
    {
        "deprecated": false,
        "target": {
            "file": "mm/slub.c",
            "function": "___slab_alloc"
        },
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@850470a8413a8a78e772c4f6bd9fe81ec6bd5b0f",
        "id": "CVE-2025-39843-fea72e16",
        "digest": {
            "function_hash": "66142107571853034315837348969911252687",
            "length": 4181.0
        }
    }
]

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

5.19.0

Fixed

6.1.151

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.105

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.46

Type: ECOSYSTEM
Events: Introduced

6.13.0

Fixed

6.16.6