CVE-2025-21884

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Source
https://nvd.nist.gov/vuln/detail/CVE-2025-21884
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21884.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-21884
Related
Published
2025-03-27T15:15:56Z
Modified
2025-03-27T20:55:39.520833Z
Downstream
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

net: better track kernel sockets lifetime

While kernel sockets are dismantled during pernetoperations->exit(), their freeing can be delayed by any tx packets still held in qdisc or device queues, due to skbsetownerw() prior calls.

This then trigger the following warning from reftrackerdir_exit() [1]

To fix this, make sure that kernel sockets own a reference on net->passive.

Add sknetrefcnt_upgrade() helper, used whenever a kernel socket is converted to a refcounted one.

[1]

[ 136.263918][ T35] reftracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at [ 136.263918][ T35] skalloc+0x2b3/0x370 [ 136.263918][ T35] inet6create+0x6ce/0x10f0 [ 136.263918][ T35] _sockcreate+0x4c0/0xa30 [ 136.263918][ T35] inetctlsockcreate+0xc2/0x250 [ 136.263918][ T35] igmp6netinit+0x39/0x390 [ 136.263918][ T35] opsinit+0x31e/0x590 [ 136.263918][ T35] setupnet+0x287/0x9e0 [ 136.263918][ T35] copynetns+0x33f/0x570 [ 136.263918][ T35] createnewnamespaces+0x425/0x7b0 [ 136.263918][ T35] unsharensproxynamespaces+0x124/0x180 [ 136.263918][ T35] ksysunshare+0x57d/0xa70 [ 136.263918][ T35] _x64sysunshare+0x38/0x40 [ 136.263918][ T35] dosyscall64+0xf3/0x230 [ 136.263918][ T35] entrySYSCALL64afterhwframe+0x77/0x7f [ 136.263918][ T35] [ 136.343488][ T35] reftracker: net notrefcnt@ffff8880638f01e0 has 1/2 users at [ 136.343488][ T35] skalloc+0x2b3/0x370 [ 136.343488][ T35] inet6create+0x6ce/0x10f0 [ 136.343488][ T35] _sockcreate+0x4c0/0xa30 [ 136.343488][ T35] inetctlsockcreate+0xc2/0x250 [ 136.343488][ T35] ndiscnetinit+0xa7/0x2b0 [ 136.343488][ T35] opsinit+0x31e/0x590 [ 136.343488][ T35] setupnet+0x287/0x9e0 [ 136.343488][ T35] copynetns+0x33f/0x570 [ 136.343488][ T35] createnewnamespaces+0x425/0x7b0 [ 136.343488][ T35] unsharensproxynamespaces+0x124/0x180 [ 136.343488][ T35] ksysunshare+0x57d/0xa70 [ 136.343488][ T35] _x64sysunshare+0x38/0x40 [ 136.343488][ T35] dosyscall64+0xf3/0x230 [ 136.343488][ T35] entrySYSCALL64afterhwframe+0x77/0x7f

References

Affected packages

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.1.112-1
6.1.115-1
6.1.119-1
6.1.123-1
6.1.124-1
6.1.128-1
6.1.129-1
6.3.1-1~exp1
6.3.2-1~exp1
6.3.4-1~exp1
6.3.5-1~exp1
6.3.7-1~bpo12+1
6.3.7-1
6.3.11-1
6.4~rc6-1~exp1
6.4~rc7-1~exp1
6.4.1-1~exp1
6.4.4-1~bpo12+1
6.4.4-1
6.4.4-2
6.4.4-3~bpo12+1
6.4.4-3
6.4.11-1
6.4.13-1
6.5~rc4-1~exp1
6.5~rc6-1~exp1
6.5~rc7-1~exp1
6.5.1-1~exp1
6.5.3-1~bpo12+1
6.5.3-1
6.5.6-1
6.5.8-1
6.5.10-1~bpo12+1
6.5.10-1
6.5.13-1
6.6.3-1~exp1
6.6.4-1~exp1
6.6.7-1~exp1
6.6.8-1
6.6.9-1
6.6.11-1
6.6.13-1~bpo12+1
6.6.13-1
6.6.15-1
6.6.15-2
6.7-1~exp1
6.7.1-1~exp1
6.7.4-1~exp1
6.7.7-1
6.7.9-1
6.7.9-2
6.7.12-1~bpo12+1
6.7.12-1
6.8.9-1
6.8.11-1
6.8.12-1~bpo12+1
6.8.12-1
6.9.2-1~exp1
6.9.7-1~bpo12+1
6.9.7-1
6.9.8-1
6.9.9-1
6.9.10-1~bpo12+1
6.9.10-1
6.9.11-1
6.9.12-1
6.10-1~exp1
6.10.1-1~exp1
6.10.3-1
6.10.4-1
6.10.6-1~bpo12+1
6.10.6-1
6.10.7-1
6.10.9-1
6.10.11-1~bpo12+1
6.10.11-1
6.10.12-1
6.11~rc4-1~exp1
6.11~rc5-1~exp1
6.11-1~exp1
6.11.2-1
6.11.4-1
6.11.5-1~bpo12+1
6.11.5-1
6.11.6-1
6.11.7-1
6.11.9-1
6.11.10-1~bpo12+1
6.11.10-1
6.12~rc6-1~exp1
6.12.3-1
6.12.5-1
6.12.6-1
6.12.8-1
6.12.9-1~bpo12+1
6.12.9-1
6.12.9-1+alpha
6.12.10-1
6.12.11-1
6.12.11-1+alpha
6.12.11-1+alpha.1
6.12.12-1~bpo12+1
6.12.12-1
6.12.13-1
6.12.15-1
6.12.16-1
6.12.17-1
6.12.19-1
6.12.20-1
6.13~rc6-1~exp1
6.13~rc7-1~exp1
6.13.2-1~exp1
6.13.3-1~exp1
6.13.4-1~exp1
6.13.5-1~exp1
6.13.6-1~exp1
6.13.7-1~exp1
6.13.8-1~exp1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}