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Vulnerability record · CVE-2023-53559 · published 4 October 2025

CVE-2023-53559: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ip_vti: fix potential slab-use-after-free in decode_session6 When ip_vti 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 ip_vti device sends IPv6 packets. As commit f855691975bb ("xfrm6: Fix the nexthdr offset in _decode_session6.") showed, xfrm_decode_session was originally intended only for the receive path. IP6CB(skb)->nhoff is not set during transmission. Therefore, set the cb field in the skb to 0 before sending packets.

7.8 CVSS 3.1 High EPSS 0.15% · top 96.6% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
4 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: ip_vti: fix potential slab-use-after-free in decode_session6 When ip_vti 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 ip_vti device sends IPv6 packets. As commit f855691975bb ("xfrm6: Fix the nexthdr offset in _decode_session6.") showed, xfrm_decode_session was originally intended only for the receive path. IP6CB(skb)->nhoff is not set during transmission. Therefore, set the cb field in the skb to 0 before sending packets.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0b4d69539fdea138af2befe08893850c89248068 Patch
https://git.kernel.org/stable/c/2b05bf5dc437f7891dd409a3eaf5058459391c7a Patch
https://git.kernel.org/stable/c/6018a266279b1a75143c7c0804dd08a5fc4c3e0b Patch
https://git.kernel.org/stable/c/78e397a43e1c47321a4679cc49a6c4530bf820b9 Patch
https://git.kernel.org/stable/c/7dfe23659f3677c08a60a0056cda2d91a79c15ca Patch
https://git.kernel.org/stable/c/82fb41c5de243e7dfa90f32ca58e35adaff56c1d Patch
https://git.kernel.org/stable/c/d34c30442d5e53a33cde79ca163320dbe2432cbd Patch
https://git.kernel.org/stable/c/e1e04cc2ef2c0c0866c19f5627149a76c2baae32 Patch

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Source: NIST National Vulnerability Database (record CVE-2023-53559), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.