CVE-2022-49647
- Source
- https://cve.org/CVERecord?id=CVE-2022-49647
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49647.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-49647
- Downstream
- Related
- Published
- 2025-02-26T02:23:51.561Z
- Modified
- 2026-03-10T21:49:06.564806Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- cgroup: Use separate src/dst nodes when preloading css_sets for migration
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
cgroup: Use separate src/dst nodes when preloading css_sets for migration
Each cset (cssset) is pinned by its tasks. When we're moving tasks around across csets for a migration, we need to hold the source and destination csets to ensure that they don't go away while we're moving tasks about. This is done by linking cset->mgpreloadnode on either the mgctx->preloadedsrccsets or mgctx->preloadeddstcsets list. Using the same cset->mgpreload_node for both the src and dst lists was deemed okay as a cset can't be both the source and destination at the same time.
Unfortunately, this overloading becomes problematic when multiple tasks are involved in a migration and some of them are identity noop migrations while others are actually moving across cgroups. For example, this can happen with the following sequence on cgroup1:
#1> mkdir -p /sys/fs/cgroup/misc/a/b #2> echo $$ > /sys/fs/cgroup/misc/a/cgroup.procs #3> RUNACOMMANDWHICHCREATESMULTIPLETHREADS & #4> PID=$! #5> echo $PID > /sys/fs/cgroup/misc/a/b/tasks #6> echo $PID > /sys/fs/cgroup/misc/a/cgroup.procs
the process including the group leader back into a. In this final migration, non-leader threads would be doing identity migration while the group leader is doing an actual one.
After #3, let's say the whole process was in cset A, and that after #4, the leader moves to cset B. Then, during #6, the following happens:
cgroupmigrateadd_src() is called on B for the leader.
cgroupmigrateadd_src() is called on A for the other threads.
cgroupmigrateprepare_dst() is called. It scans the src list.
It notices that B wants to migrate to A, so it tries to A to the dst list but realizes that its ->mgpreloadnode is already busy.
and then it notices A wants to migrate to A as it's an identity migration, it culls it by listdelinit()'ing its ->mgpreloadnode and putting references accordingly.
The rest of migration takes place with B on the src list but nothing on the dst list.
This means that A isn't held while migration is in progress. If all tasks leave A before the migration finishes and the incoming task pins it, the cset will be destroyed leading to use-after-free.
This is caused by overloading cset->mgpreloadnode for both src and dst preload lists. We wanted to exclude the cset from the src list but ended up inadvertently excluding it from the dst list too.
This patch fixes the issue by separating out cset->mgpreloadnode into ->mgsrcpreloadnode and ->mgdstpreloadnode, so that the src and dst preloadings don't interfere with each other.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49647.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/05f7658210d1d331e8dd4cb6e7bbbe3df5f5ac27
- https://git.kernel.org/stable/c/07fd5b6cdf3cc30bfde8fe0f644771688be04447
- https://git.kernel.org/stable/c/0e41774b564befa6d271e8d5086bf870d617a4e6
- https://git.kernel.org/stable/c/54aee4e5ce8c21555286a6333e46c1713880cf93
- https://git.kernel.org/stable/c/7657e3958535d101a24ab4400f9b8062b9107cc4
- https://git.kernel.org/stable/c/ad44e05f3e016bdcb1ad25af35ade5b5f41ccd68
- https://git.kernel.org/stable/c/cec2bbdcc14fbaa6b95ee15a7c423b05d97038be
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49647.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-49647
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
-
Introducedf817de98513d060023be4fa1d061b29a6515273eFixed05f7658210d1d331e8dd4cb6e7bbbe3df5f5ac27Fixedcec2bbdcc14fbaa6b95ee15a7c423b05d97038beFixedad44e05f3e016bdcb1ad25af35ade5b5f41ccd68Fixed7657e3958535d101a24ab4400f9b8062b9107cc4Fixed54aee4e5ce8c21555286a6333e46c1713880cf93Fixed0e41774b564befa6d271e8d5086bf870d617a4e6Fixed07fd5b6cdf3cc30bfde8fe0f644771688be04447
Affected versions
v3.*
v3.15
v3.15-rc2
v3.15-rc3
v3.15-rc4
v3.15-rc5
v3.15-rc6
v3.15-rc7
v3.15-rc8
v3.16
v3.16-rc1
v3.16-rc2
v3.16-rc3
v3.16-rc4
v3.16-rc5
v3.16-rc6
v3.16-rc7
v3.17
v3.17-rc1
v3.17-rc2
v3.17-rc3
v3.17-rc4
v3.17-rc5
v3.17-rc6
v3.17-rc7
v3.18
v3.18-rc1
v3.18-rc2
v3.18-rc3
v3.18-rc4
v3.18-rc5
v3.18-rc6
v3.18-rc7
v3.19
v3.19-rc1
v3.19-rc2
v3.19-rc3
v3.19-rc4
v3.19-rc5
v3.19-rc6
v3.19-rc7
v4.*
v4.0
v4.0-rc1
v4.0-rc2
v4.0-rc3
v4.0-rc4
v4.0-rc5
v4.0-rc6
v4.0-rc7
v4.1
v4.1-rc1
v4.1-rc2
v4.1-rc3
v4.1-rc4
v4.1-rc5
v4.1-rc6
v4.1-rc7
v4.1-rc8
v4.10
v4.10-rc1
v4.10-rc2
v4.10-rc3
v4.10-rc4
v4.10-rc5
v4.10-rc6
v4.10-rc7
v4.10-rc8
v4.11
v4.11-rc1
v4.11-rc2
v4.11-rc3
v4.11-rc4
v4.11-rc5
v4.11-rc6
v4.11-rc7
v4.11-rc8
v4.12
v4.12-rc1
v4.12-rc2
v4.12-rc3
v4.12-rc4
v4.12-rc5
v4.12-rc6
v4.12-rc7
v4.13
v4.13-rc1
v4.13-rc2
v4.13-rc3
v4.13-rc4
v4.13-rc5
v4.13-rc6
v4.13-rc7
v4.14
v4.14-rc1
v4.14-rc2
v4.14-rc3
v4.14-rc4
v4.14-rc5
v4.14-rc6
v4.14-rc7
v4.14-rc8
v4.14.1
v4.14.10
v4.14.100
v4.14.101
v4.14.102
v4.14.103
v4.14.104
v4.14.105
v4.14.106
v4.14.107
v4.14.108
v4.14.109
v4.14.11
v4.14.110
v4.14.111
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v4.14.113
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v4.14.12
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v4.14.139
v4.14.14
v4.14.140
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v4.14.193
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v4.14.2
v4.14.20
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v4.14.201
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v4.14.286
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v4.14.288
v4.14.29
v4.14.3
v4.14.30
v4.14.31
v4.14.32
v4.14.33
v4.14.34
v4.14.35
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v4.14.39
v4.14.4
v4.14.40
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v4.14.44
v4.14.45
v4.14.46
v4.14.47
v4.14.48
v4.14.49
v4.14.5
v4.14.50
v4.14.51
v4.14.52
v4.14.53
v4.14.54
v4.14.55
v4.14.56
v4.14.57
v4.14.58
v4.14.59
v4.14.6
v4.14.60
v4.14.61
v4.14.62
v4.14.63
v4.14.64
v4.14.65
v4.14.66
v4.14.67
v4.14.68
v4.14.69
v4.14.7
v4.14.70
v4.14.71
v4.14.72
v4.14.73
v4.14.74
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v4.14.76
v4.14.77
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v4.14.8
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v4.14.84
v4.14.85
v4.14.86
v4.14.87
v4.14.88
v4.14.89
v4.14.9
v4.14.90
v4.14.91
v4.14.92
v4.14.93
v4.14.94
v4.14.95
v4.14.96
v4.14.97
v4.14.98
v4.14.99
v4.15
v4.15-rc1
v4.15-rc2
v4.15-rc3
v4.15-rc4
v4.15-rc5
v4.15-rc6
v4.15-rc7
v4.15-rc8
v4.15-rc9
v4.16
v4.16-rc1
v4.16-rc2
v4.16-rc3
v4.16-rc4
v4.16-rc5
v4.16-rc6
v4.16-rc7
v4.17
v4.17-rc1
v4.17-rc2
v4.17-rc3
v4.17-rc4
v4.17-rc5
v4.17-rc6
v4.17-rc7
v4.18
v4.18-rc1
v4.18-rc2
v4.18-rc3
v4.18-rc4
v4.18-rc5
v4.18-rc6
v4.18-rc7
v4.18-rc8
v4.19
v4.19-rc1
v4.19-rc2
v4.19-rc3
v4.19-rc4
v4.19-rc5
v4.19-rc6
v4.19-rc7
v4.19-rc8
v4.19.1
v4.19.10
v4.19.100
v4.19.101
v4.19.102
v4.19.103
v4.19.104
v4.19.105
v4.19.106
v4.19.107
v4.19.108
v4.19.109
v4.19.11
v4.19.110
v4.19.111
v4.19.112
v4.19.113
v4.19.114
v4.19.115
v4.19.116
v4.19.117
v4.19.118
v4.19.119
v4.19.12
v4.19.120
v4.19.121
v4.19.122
v4.19.123
v4.19.124
v4.19.125
v4.19.126
v4.19.127
v4.19.128
v4.19.129
v4.19.13
v4.19.130
v4.19.131
v4.19.132
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v4.19.134
v4.19.135
v4.19.136
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v4.19.139
v4.19.14
v4.19.140
v4.19.141
v4.19.142
v4.19.143
v4.19.144
v4.19.145
v4.19.146
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v4.19.148
v4.19.149
v4.19.15
v4.19.150
v4.19.151
v4.19.152
v4.19.153
v4.19.154
v4.19.155
v4.19.156
v4.19.157
v4.19.158
v4.19.159
v4.19.16
v4.19.160
v4.19.161
v4.19.162
v4.19.163
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v4.19.168
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v4.19.17
v4.19.170
v4.19.171
v4.19.172
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v4.19.18
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v4.19.195
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v4.19.197
v4.19.198
v4.19.199
v4.19.2
v4.19.20
v4.19.200
v4.19.201
v4.19.202
v4.19.203
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v4.19.23
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v4.19.26
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v4.19.3
v4.19.30
v4.19.31
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v4.19.33
v4.19.34
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v4.19.4
v4.19.40
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v4.19.42
v4.19.43
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v4.19.47
v4.19.48
v4.19.49
v4.19.5
v4.19.50
v4.19.51
v4.19.52
v4.19.53
v4.19.54
v4.19.55
v4.19.56
v4.19.57
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v4.19.6
v4.19.60
v4.19.61
v4.19.62
v4.19.63
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v4.19.65
v4.19.66
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v4.19.69
v4.19.7
v4.19.70
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v4.19.8
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v4.19.9
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v4.19.92
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v4.19.95
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v4.19.98
v4.19.99
v4.2
v4.2-rc1
v4.2-rc2
v4.2-rc3
v4.2-rc4
v4.2-rc5
v4.2-rc6
v4.2-rc7
v4.2-rc8
v4.20
v4.20-rc1
v4.20-rc2
v4.20-rc3
v4.20-rc4
v4.20-rc5
v4.20-rc6
v4.20-rc7
v4.3
v4.3-rc1
v4.3-rc2
v4.3-rc3
v4.3-rc4
v4.3-rc5
v4.3-rc6
v4.3-rc7
v4.4
v4.4-rc1
v4.4-rc2
v4.4-rc3
v4.4-rc4
v4.4-rc5
v4.4-rc6
v4.4-rc7
v4.4-rc8
v4.5
v4.5-rc1
v4.5-rc2
v4.5-rc3
v4.5-rc4
v4.5-rc5
v4.5-rc6
v4.5-rc7
v4.6
v4.6-rc1
v4.6-rc2
v4.6-rc3
v4.6-rc4
v4.6-rc5
v4.6-rc6
v4.6-rc7
v4.7
v4.7-rc1
v4.7-rc2
v4.7-rc3
v4.7-rc4
v4.7-rc5
v4.7-rc6
v4.7-rc7
v4.8
v4.8-rc1
v4.8-rc2
v4.8-rc3
v4.8-rc4
v4.8-rc5
v4.8-rc6
v4.8-rc7
v4.8-rc8
v4.9
v4.9-rc1
v4.9-rc2
v4.9-rc3
v4.9-rc4
v4.9-rc5
v4.9-rc6
v4.9-rc7
v4.9-rc8
v5.*
v5.0
v5.0-rc1
v5.0-rc2
v5.0-rc3
v5.0-rc4
v5.0-rc5
v5.0-rc6
v5.0-rc7
v5.0-rc8
v5.1
v5.1-rc1
v5.1-rc2
v5.1-rc3
v5.1-rc4
v5.1-rc5
v5.1-rc6
v5.1-rc7
v5.10
v5.10-rc1
v5.10-rc2
v5.10-rc3
v5.10-rc4
v5.10-rc5
v5.10-rc6
v5.10-rc7
v5.10.1
v5.10.10
v5.10.100
v5.10.101
v5.10.102
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Database specific
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49647.json"
vanir_signatures
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},
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},
{
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},
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