CVE-2024-56751

unregisternetdevice: waiting for vethA-R1 to become free. Usage count = 6 reftracker: vethA-R1@ffff888013df15d8 has 1/5 users at dstinit+0x84/0x4a0 dstalloc+0x97/0x150 ip6dstalloc+0x23/0x90 ip6rtpcpualloc+0x1e6/0x520 ip6polroute+0x56f/0x840 fib6rulelookup+0x334/0x630 ip6routeoutputflags+0x259/0x480 ip6dstlookuptail.constprop.0+0x5c2/0x940 ip6dstlookupflow+0x88/0x190 udptunnel6dstlookup+0x2a7/0x4c0 vxlanxmitone+0xbde/0x4a50 [vxlan] vxlanxmit+0x9ad/0xf20 [vxlan] devhardstartxmit+0x10e/0x360 _devqueuexmit+0xf95/0x18c0 arpsolicit+0x4a2/0xe00 neighprobe+0xaa/0xf0

While the first suspect is the dstcache, explicitly tracking the dst owing the last device reference via probes proved such dst is held by the nexthop in the originating fib6info.

Similar to commit f5b51fe804ec ("ipv6: route: purge exception on removal"), we need to explicitly release the originating fib info when disconnecting a to-be-removed device from a live ipv6 dst: move the fib6info cleanup into ip6dst_ifdown().

Tested running:

./pmtu.sh cleanupipv6exception

in a tight loop for more than 400 iterations with no spat, running an unpatched kernel I observed a splat every ~10 iterations.

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

f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74

Fixed

77aa9855a878fb43f547ddfbda3127a1e88ad31a

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

f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74

Fixed

b2f26a27ea3f72f75d18330f76f5d1007c791848

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

f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74

Fixed

43e25adc80269f917d2a195f0d59f74cdd182955

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

f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74

Fixed

a3c3f8a4d025acc8c857246ec2b812c59102487a

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

f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74

Fixed

0e4c6faaef8a24b762a24ffb767280e263ef8e10

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

f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74

Fixed

eb02688c5c45c3e7af7e71f036a7144f5639cbfe

Affected versions

v5.*

v5.10

v5.10-rc1

v5.10-rc2

v5.10-rc3

v5.10-rc4

v5.10-rc5

v5.10-rc6

v5.10-rc7

v5.11

v5.11-rc1

v5.11-rc2

v5.11-rc3

v5.11-rc4

v5.11-rc5

v5.11-rc6

v5.11-rc7

v5.12

v5.12-rc1

v5.12-rc1-dontuse

v5.12-rc2

v5.12-rc3

v5.12-rc4

v5.12-rc5

v5.12-rc6

v5.12-rc7

v5.12-rc8

v5.13

v5.13-rc1

v5.13-rc2

v5.13-rc3

v5.13-rc4

v5.13-rc5

v5.13-rc6

v5.13-rc7

v5.14

v5.14-rc1

v5.14-rc2

v5.14-rc3

v5.14-rc4

v5.14-rc5

v5.14-rc6

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

v5.15.1

v5.15.10

v5.15.100

v5.15.101

v5.15.102

v5.15.103

v5.15.104

v5.15.105

v5.15.106

v5.15.107

v5.15.108

v5.15.109

v5.15.11

v5.15.110

v5.15.111

v5.15.112

v5.15.113

v5.15.114

v5.15.115

v5.15.116

v5.15.117

v5.15.118

v5.15.119

v5.15.12

v5.15.120

v5.15.121

v5.15.122

v5.15.123

v5.15.124

v5.15.125

v5.15.126

v5.15.127

v5.15.128

v5.15.129

v5.15.13

v5.15.130

v5.15.131

v5.15.132

v5.15.133

v5.15.134

v5.15.135

v5.15.136

v5.15.137

v5.15.138

v5.15.139

v5.15.14

v5.15.140

v5.15.141

v5.15.142

v5.15.143

v5.15.144

v5.15.145

v5.15.146

v5.15.147

v5.15.148

v5.15.149

v5.15.15

v5.15.150

v5.15.151

v5.15.152

v5.15.153

v5.15.154

v5.15.155

v5.15.156

v5.15.157

v5.15.158

v5.15.159

v5.15.16

v5.15.160

v5.15.161

v5.15.162

v5.15.163

v5.15.164

v5.15.165

v5.15.166

v5.15.167

v5.15.168

v5.15.169

v5.15.17

v5.15.170

v5.15.171

v5.15.172

v5.15.173

v5.15.174

v5.15.175

v5.15.176

v5.15.177

v5.15.178

v5.15.179

v5.15.18

v5.15.180

v5.15.19

v5.15.2

v5.15.20

v5.15.21

v5.15.22

v5.15.23

v5.15.24

v5.15.25

v5.15.26

v5.15.27

v5.15.28

v5.15.29

v5.15.3

v5.15.30

v5.15.31

v5.15.32

v5.15.33

v5.15.34

v5.15.35

v5.15.36

v5.15.37

v5.15.38

v5.15.39

v5.15.4

v5.15.40

v5.15.41

v5.15.42

v5.15.43

v5.15.44

v5.15.45

v5.15.46

v5.15.47

v5.15.48

v5.15.49

v5.15.5

v5.15.50

v5.15.51

v5.15.52

v5.15.53

v5.15.54

v5.15.55

v5.15.56

v5.15.57

v5.15.58

v5.15.59

v5.15.6

v5.15.60

v5.15.61

v5.15.62

v5.15.63

v5.15.64

v5.15.65

v5.15.66

v5.15.67

v5.15.68

v5.15.69

v5.15.7

v5.15.70

v5.15.71

v5.15.72

v5.15.73

v5.15.74

v5.15.75

v5.15.76

v5.15.77

v5.15.78

v5.15.79

v5.15.8

v5.15.80

v5.15.81

v5.15.82

v5.15.83

v5.15.84

v5.15.85

v5.15.86

v5.15.87

v5.15.88

v5.15.89

v5.15.9

v5.15.90

v5.15.91

v5.15.92

v5.15.93

v5.15.94

v5.15.95

v5.15.96

v5.15.97

v5.15.98

v5.15.99

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

v5.2

v5.2-rc3

v5.2-rc4

v5.2-rc5

v5.2-rc6

v5.2-rc7

v5.3

v5.3-rc1

v5.3-rc2

v5.3-rc3

v5.3-rc4

v5.3-rc5

v5.3-rc6

v5.3-rc7

v5.3-rc8

v5.4

v5.4-rc1

v5.4-rc2

v5.4-rc3

v5.4-rc4

v5.4-rc5

v5.4-rc6

v5.4-rc7

v5.4-rc8

v5.5

v5.5-rc1

v5.5-rc2

v5.5-rc3

v5.5-rc4

v5.5-rc5

v5.5-rc6

v5.5-rc7

v5.6

v5.6-rc1

v5.6-rc2

v5.6-rc3

v5.6-rc4

v5.6-rc5

v5.6-rc6

v5.6-rc7

v5.7

v5.7-rc1

v5.7-rc2

v5.7-rc3

v5.7-rc4

v5.7-rc5

v5.7-rc6

v5.7-rc7

v5.8

v5.8-rc1

v5.8-rc2

v5.8-rc3

v5.8-rc4

v5.8-rc5

v5.8-rc6

v5.8-rc7

v5.9

v5.9-rc1

v5.9-rc2

v5.9-rc3

v5.9-rc4

v5.9-rc5

v5.9-rc6

v5.9-rc7

v5.9-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

v6.1.13

v6.1.14

v6.1.15

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

v6.11.1

v6.11.10

v6.11.2

v6.11.3

v6.11.4

v6.11.5

v6.11.6

v6.11.7

v6.11.8

v6.11.9

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

v6.2

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

v6.6.11

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

v6.6.7

v6.6.8

v6.6.9

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

[
    {
        "target": {
            "file": "net/ipv6/route.c",
            "function": "ip6_dst_ifdown"
        },
        "signature_version": "v1",
        "id": "CVE-2024-56751-01fc5b7d",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb02688c5c45c3e7af7e71f036a7144f5639cbfe",
        "digest": {
            "function_hash": "274181833741433117768394702156930454253",
            "length": 283.0
        },
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "net/ipv6/route.c",
            "function": "rt6_remove_exception"
        },
        "signature_version": "v1",
        "id": "CVE-2024-56751-04f15752",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@77aa9855a878fb43f547ddfbda3127a1e88ad31a",
        "digest": {
            "function_hash": "147374859402863029994565236094761352974",
            "length": 490.0
        },
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "net/ipv6/route.c"
        },
        "signature_version": "v1",
        "id": "CVE-2024-56751-1c284f04",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@eb02688c5c45c3e7af7e71f036a7144f5639cbfe",
        "digest": {
            "line_hashes": [
                "143660982353546743424230537068513887483",
                "91900319400325772050420617232385988303",
                "252104772808012224198729376088928135750",
                "250655405018220570750200526462171506638",
                "15457252396331132911561032636818815333",
                "168774869241230097468670148110096999253",
                "166144027108892451148511233093462093986",
                "80765803609771234757054177939565488450",
                "81676333130211775615298719002186731612",
                "26771086856946239922716176482218825089",
                "325940665620582091029057987105962344091",
                "290329091230317444921484548632122905652",
                "208352578317118388958669297996206067739",
                "149356250773098631072549761956130813607",
                "122297597866443793013561375969711773077",
                "269318197537837530259836174044136595931",
                "137934986434951804685322043880853516392"
            ],
            "threshold": 0.9
        },
        "signature_type": "Line"
    },
    {
        "target": {
            "file": "net/ipv6/route.c",
            "function": "ip6_dst_ifdown"
        },
        "signature_version": "v1",
        "id": "CVE-2024-56751-375b3611",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@43e25adc80269f917d2a195f0d59f74cdd182955",
        "digest": {
            "function_hash": "159934568611836230878513064868074842437",
            "length": 282.0
        },
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "net/ipv6/route.c",
            "function": "ip6_dst_ifdown"
        },
        "signature_version": "v1",
        "id": "CVE-2024-56751-38d688d1",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@b2f26a27ea3f72f75d18330f76f5d1007c791848",
        "digest": {
            "function_hash": "211475279044173711179703388300514938141",
            "length": 296.0
        },
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "net/ipv6/route.c"
        },
        "signature_version": "v1",
        "id": "CVE-2024-56751-41d7fea5",
        "deprecated": false,
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@b2f26a27ea3f72f75d18330f76f5d1007c791848",
        "digest": {
            "line_hashes": [
                "218673997929350435132443069738784624827",
                "314658926535669494276709516543452025505",
                "136644331973440861435629189418874694432",
                "250655405018220570750200526462171506638",
                "15457252396331132911561032636818815333",
                "168774869241230097468670148110096999253",
                "166144027108892451148511233093462093986",
                "80765803609771234757054177939565488450",
                "81676333130211775615298719002186731612",
                "26771086856946239922716176482218825089",
                "325940665620582091029057987105962344091",
                "290329091230317444921484548632122905652",
                "208352578317118388958669297996206067739",
                "149356250773098631072549761956130813607",
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Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

5.3.0

Fixed

5.15.181

Type: ECOSYSTEM
Events: Introduced

5.16.0

Fixed

6.1.120

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.64

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.11.11

Type: ECOSYSTEM
Events: Introduced

6.12.0

Fixed

6.12.2