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CVE-2022-48956

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ipv6: avoid use-after-free in ip6_fragment() Blamed commit claimed rcu_read_lock() was held by ip6_fragment() callers.

Published Oct 21, 2024CWE-416EPSS 0.27%

Overview

CVE-2022-48956 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

ipv6: avoid use-after-free in ip6_fragment()

Blamed commit claimed rcu_read_lock() was held by ip6_fragment() callers.

It seems to not be always true, at least for UDP stack.

syzbot reported:

BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:245 [inline]

BUG: KASAN: use-after-free in ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951

Read of size 8 at addr ffff88801d403e80 by task syz-executor.3/7618

CPU: 1 PID: 7618 Comm: syz-executor.3 Not tainted 6.1.0-rc6-syzkaller-00012-g4312098baf37 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:88 [inline]

dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106

print_address_description mm/kasan/report.c:284 [inline]

print_report+0x15e/0x45d mm/kasan/report.c:395

kasan_report+0xbf/0x1f0 mm/kasan/report.c:495

ip6_dst_idev include/net/ip6_fib.h:245 [inline]

ip6_frag

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/6b6d3be3661bff2746cab26147bd629aa034e094Refgit.kernel.org/stable/c/7390c70bd431cbfa6951477e2c80a301643e284bRefgit.kernel.org/stable/c/7e0dcd5f3ade221a6126278aca60c8ab4cc3bce9Refgit.kernel.org/stable/c/803e84867de59a1e5d126666d25eb4860cfd2ebeRefgit.kernel.org/stable/c/8208d7e56b1e579320b9ff3712739ad2e63e1f86Refgit.kernel.org/stable/c/9b1a468a455d8319041528778d0e684a4c062792Refgit.kernel.org/stable/c/b3d7ff8c04a83279fb7641fc4d5aa82a602df7c0

How CyberStrike helps

Frequently asked questions

What is CVE-2022-48956?

CVE-2022-48956 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-48956?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-48956?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-48956?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-48956 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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