CVE-2022-49865

Source
https://nvd.nist.gov/vuln/detail/CVE-2022-49865
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49865.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-49865
Related
Published
2025-05-01T15:16:11Z
Modified
2025-05-02T14:49:55.816755Z
Summary
[none]
Details

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

ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network

When copying a struct ifaddrlblmsg to the network, _ifalreserved remained uninitialized, resulting in a 1-byte infoleak:

BUG: KMSAN: kernel-network-infoleak in _netdevstartxmit ./include/linux/netdevice.h:4841 _netdevstartxmit ./include/linux/netdevice.h:4841 netdevstartxmit ./include/linux/netdevice.h:4857 xmitone net/core/dev.c:3590 devhardstartxmit+0x1dc/0x800 net/core/dev.c:3606 _devqueuexmit+0x17e8/0x4350 net/core/dev.c:4256 devqueuexmit ./include/linux/netdevice.h:3009 _netlinkdelivertapskb net/netlink/afnetlink.c:307 _netlinkdelivertap+0x728/0xad0 net/netlink/afnetlink.c:325 netlinkdelivertap net/netlink/afnetlink.c:338 _netlinksendskb net/netlink/afnetlink.c:1263 netlinksendskb+0x1d9/0x200 net/netlink/afnetlink.c:1272 netlinkunicast+0x56d/0xf50 net/netlink/afnetlink.c:1360 nlmsgunicast ./include/net/netlink.h:1061 rtnlunicast+0x5a/0x80 net/core/rtnetlink.c:758 ip6addrlblget+0xfad/0x10f0 net/ipv6/addrlabel.c:628 rtnetlinkrcvmsg+0xb33/0x1570 net/core/rtnetlink.c:6082 ... Uninit was created at: slabpostallochook+0x118/0xb00 mm/slab.h:742 slaballocnode mm/slub.c:3398 _kmemcacheallocnode+0x4f2/0x930 mm/slub.c:3437 _dokmallocnode mm/slabcommon.c:954 _kmallocnodetrackcaller+0x117/0x3d0 mm/slabcommon.c:975 kmallocreserve net/core/skbuff.c:437 _allocskb+0x27a/0xab0 net/core/skbuff.c:509 allocskb ./include/linux/skbuff.h:1267 nlmsgnew ./include/net/netlink.h:964 ip6addrlblget+0x490/0x10f0 net/ipv6/addrlabel.c:608 rtnetlinkrcvmsg+0xb33/0x1570 net/core/rtnetlink.c:6082 netlinkrcvskb+0x299/0x550 net/netlink/afnetlink.c:2540 rtnetlinkrcv+0x26/0x30 net/core/rtnetlink.c:6109 netlinkunicastkernel net/netlink/afnetlink.c:1319 netlinkunicast+0x9ab/0xf50 net/netlink/afnetlink.c:1345 netlinksendmsg+0xebc/0x10f0 net/netlink/afnetlink.c:1921 ...

This patch ensures that the reserved field is always initialized.

References

Affected packages

Debian:11 / 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
Fixed
5.10.158-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1
5.10.84-1
5.10.92-1~bpo10+1
5.10.92-1
5.10.92-2
5.10.103-1~bpo10+1
5.10.103-1
5.10.106-1
5.10.113-1
5.10.120-1~bpo10+1
5.10.120-1
5.10.127-1
5.10.127-2~bpo10+1
5.10.127-2
5.10.136-1
5.10.140-1
5.10.148-1
5.10.149-1
5.10.149-2

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / 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
Fixed
6.0.10-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

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
Fixed
6.0.10-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}