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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/0b4d69539fdea138af2befe08893850c89248068 cve-icon cve-icon
https://git.kernel.org/stable/c/2b05bf5dc437f7891dd409a3eaf5058459391c7a cve-icon cve-icon
https://git.kernel.org/stable/c/6018a266279b1a75143c7c0804dd08a5fc4c3e0b cve-icon cve-icon
https://git.kernel.org/stable/c/78e397a43e1c47321a4679cc49a6c4530bf820b9 cve-icon cve-icon
https://git.kernel.org/stable/c/7dfe23659f3677c08a60a0056cda2d91a79c15ca cve-icon cve-icon
https://git.kernel.org/stable/c/82fb41c5de243e7dfa90f32ca58e35adaff56c1d cve-icon cve-icon
https://git.kernel.org/stable/c/d34c30442d5e53a33cde79ca163320dbe2432cbd cve-icon cve-icon
https://git.kernel.org/stable/c/e1e04cc2ef2c0c0866c19f5627149a76c2baae32 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025100449-CVE-2023-53559-c2f0@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2023-53559 cve-icon
https://www.cve.org/CVERecord?id=CVE-2023-53559 cve-icon
History

Mon, 06 Oct 2025 22:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Mon, 06 Oct 2025 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Sat, 04 Oct 2025 15:30:00 +0000

Type Values Removed Values Added
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.
Title ip_vti: fix potential slab-use-after-free in decode_session6
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-10-04T15:17:03.497Z

Reserved: 2025-10-04T15:14:15.923Z

Link: CVE-2023-53559

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-10-04T16:15:51.280

Modified: 2025-10-06T14:56:21.733

Link: CVE-2023-53559

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-10-04T00:00:00Z

Links: CVE-2023-53559 - Bugzilla