CVE-2022-49904 - Vulnerability Details

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

Description

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

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

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:__neigh_ifdown.isra.0+0x24b/0x370
RSP: 0018:ffff888012677908 EFLAGS: 00000202
...
Call Trace:
<TASK>
neigh_table_clear+0x94/0x2d0
ndisc_cleanup+0x27/0x40 [ipv6]
inet6_init+0x21c/0x2cb [ipv6]
do_one_initcall+0xd3/0x4d0
do_init_module+0x1ae/0x670
...
Kernel panic - not syncing: Fatal exception

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

neigh_table_clear()
neigh_ifdown(tbl, NULL)
pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL))
# dev_net(NULL) triggers null-ptr-deref.

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

Published: 2025-05-01

Score: 5.5 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`9bbaed571c4bf1b62ac8703cb359dc090efc3455`	affected	< 0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0
`05fdce1ae744dee43c9181fd063c9c0db4f777f2`	affected	< b736592de2aa53aee2d48d6b129bc0c892007bbe
`51be9dd391fd25872b95708a0250f2f7722d2d8e`	affected	< b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c
`c35adafe42bd6c3bf2aca0a3f523dabc38fc23c8`	affected	< 1c89642e7f2b7ecc9635610653f5c2f0276c0051
`db6fa03d80ab076238fc806c9925d1f8b9639d1b`	affected	< 2b45d6d0c41cb9593868e476681efb1aae5078a1
`66ba215cb51323e4e55e38fd5f250e0fae0cbc94`	affected	< a99a8ec4c62180c889482a2ff6465033e0743458
`66ba215cb51323e4e55e38fd5f250e0fae0cbc94`	affected	< f8017317cb0b279b8ab98b0f3901a2e0ac880dad
`2dd5ed474115150d8175825bc3b56c6385c3a83b`	affected	—

Linux

affected

Version	Status	Constraints
`6.0`	affected	—
`0`	unaffected	< 6.0
`4.14.299`	unaffected	≤ 4.14.*
`4.19.265`	unaffected	≤ 4.19.*
`5.4.224`	unaffected	≤ 5.4.*
`5.10.154`	unaffected	≤ 5.10.*
`5.15.78`	unaffected	≤ 5.15.*
`6.0.8`	unaffected	≤ 6.0.*
`6.1`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc1::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
EUVD	EUVD-2025-12848	In the Linux kernel, the following vulnerability has been resolved: net, neigh: Fix null-ptr-deref in neigh_table_clear() 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:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception When ipv6 initialization fails, it will try to cleanup and calls: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) triggers null-ptr-deref. Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00063.

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0
https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051
https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1
https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458
https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c
https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe
https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad
https://lore.kernel.org/linux-cve-announce/2025050102-CVE-2022-49904-5009@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-49904
https://www.cve.org/CVERecord?id=CVE-2022-49904

History

Wed, 01 Oct 2025 16:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 07 May 2025 14:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
Weaknesses		CWE-476
CPEs		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:6.1:rc1:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc2:::::: cpe:2.3:o:linux:linux_kernel:6.1:rc3::::::
Vendors & Products		Linux Linux linux Kernel

Fri, 02 May 2025 14:00:00 +0000

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2025050102-CVE-2022-49904-5009@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2022-49904 https://www.cve.org/CVERecord?id=CVE-2022-49904
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Thu, 01 May 2025 14:30:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: net, neigh: Fix null-ptr-deref in neigh_table_clear() 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:__neigh_ifdown.isra.0+0x24b/0x370 RSP: 0018:ffff888012677908 EFLAGS: 00000202 ... Call Trace: <TASK> neigh_table_clear+0x94/0x2d0 ndisc_cleanup+0x27/0x40 [ipv6] inet6_init+0x21c/0x2cb [ipv6] do_one_initcall+0xd3/0x4d0 do_init_module+0x1ae/0x670 ... Kernel panic - not syncing: Fatal exception When ipv6 initialization fails, it will try to cleanup and calls: neigh_table_clear() neigh_ifdown(tbl, NULL) pneigh_queue_purge(&tbl->proxy_queue, dev_net(dev == NULL)) # dev_net(NULL) triggers null-ptr-deref. Fix it by passing NULL to pneigh_queue_purge() in neigh_ifdown() if dev is NULL, to make kernel not panic immediately.
Title		net, neigh: Fix null-ptr-deref in neigh_table_clear()
References		https://git.kernel.org/stable/c/0d38b4ca6679e72860ff8730e79bb99d0e9fa3b0 https://git.kernel.org/stable/c/1c89642e7f2b7ecc9635610653f5c2f0276c0051 https://git.kernel.org/stable/c/2b45d6d0c41cb9593868e476681efb1aae5078a1 https://git.kernel.org/stable/c/a99a8ec4c62180c889482a2ff6465033e0743458 https://git.kernel.org/stable/c/b49f6b2f21f543d4dc88fb7b1ec2adccb822f27c https://git.kernel.org/stable/c/b736592de2aa53aee2d48d6b129bc0c892007bbe https://git.kernel.org/stable/c/f8017317cb0b279b8ab98b0f3901a2e0ac880dad

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-05-01T14:10:48.998Z

Updated: 2026-05-11T19:08:58.357Z

Reserved: 2025-05-01T14:05:17.245Z

Link: CVE-2022-49904

Vulnrichment

Updated: 2025-10-01T14:22:34.831Z

NVD

Status : Modified

Published: 2025-05-01T15:16:15.480

Modified: 2025-10-01T16:15:50.540

Link: CVE-2022-49904

Redhat

Severity : Moderate

Publid Date: 2025-05-01T00:00:00Z

Links: CVE-2022-49904 - Bugzilla

OpenCVE Enrichment

No data.

Weaknesses

CWE-476

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Subscriptions

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