CVE-2022-49904

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Source
https://nvd.nist.gov/vuln/detail/CVE-2022-49904
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49904.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2022-49904
Related
Published
2025-05-01T15:16:15Z
Modified
2025-05-07T14:47:40.781667Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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

net, neigh: Fix null-ptr-deref in neightableclear()

When IPv6 module gets initialized but hits an error in the middle, kenel panic with:

KASAN: null-ptr-deref in range [0x0000000000000598-0x000000000000059f] CPU: 1 PID: 361 Comm: insmod Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:_neighifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neightableclear+0x94/0x2d0 ndisccleanup+0x27/0x40 [ipv6] inet6init+0x21c/0x2cb [ipv6] dooneinitcall+0xd3/0x4d0 doinitmodule+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception

When ipv6 initialization fails, it will try to cleanup and calls:

neightableclear() neighifdown(tbl, NULL) pneighqueuepurge(&tbl->proxyqueue, devnet(dev == NULL)) # devnet(NULL) triggers null-ptr-deref.

Fix it by passing NULL to pneighqueuepurge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.

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
6.0.8-1

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
6.0.8-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}