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CVE-2023-53500

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: xfrm: fix slab-use-after-free in decode_session6 When the xfrm device is set to the qdisc of the sfb type, the cb field of the…

Published Oct 1, 2025CWE-416EPSS 0.16%

Overview

CVE-2023-53500 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, 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:

xfrm: fix slab-use-after-free in decode_session6

When the xfrm device is set to the qdisc of the sfb type, the cb field

of the sent skb may be modified during enqueuing. Then,

slab-use-after-free may occur when the xfrm device sends IPv6 packets.

The stack information is as follows:

BUG: KASAN: slab-use-after-free in decode_session6+0x103f/0x1890

Read of size 1 at addr ffff8881111458ef by task swapper/3/0

CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.4.0-next-20230707 #409

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014

Call Trace:

<IRQ>

dump_stack_lvl+0xd9/0x150

print_address_description.constprop.0+0x2c/0x3c0

kasan_report+0x11d/0x130

decode_session6+0x103f/0x1890

__xfrm_decode_session+0x54/0xb0

xfrmi_xmit+0x173/0x1ca0

dev_hard_start_xmit+0x187/0x700

sch_direct_xmit+0x1a3/0xc30

__qdisc_run+0x510/0x17a0

__dev_queue_xmit+0x2215/0x3b10

neigh_connected_output+0x3c2/0x550

ip6_finish_ou

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/0d27567fde5be5f0edc2db5c110142b7915b8fa8Refgit.kernel.org/stable/c/44b3d40967009304617a7a6486490c1d6c12f899Refgit.kernel.org/stable/c/53223f2ed1ef5c90dad814daaaefea4e68a933c8Refgit.kernel.org/stable/c/86f15300a22656db3fa8c8967defbcd24fac4d37Refgit.kernel.org/stable/c/bafa236380816b41b2c4c6970d9067fefa4a6c9eRefgit.kernel.org/stable/c/da4cbaa75ed088b6d70db77b9103a27e2359e243Refgit.kernel.org/stable/c/db0e50741f0387f388e9ec824ea7ae8456554d5b

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53500?

CVE-2023-53500 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2023-53500?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2023-53500?

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-2023-53500?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53500 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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