ip_vti: fix potential slab-use-after-free in decode_session6
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.
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0b4d69539fdea138af2befe08893850c89248068
- https://git.kernel.org/stable/c/2b05bf5dc437f7891dd409a3eaf5058459391c7a
- https://git.kernel.org/stable/c/6018a266279b1a75143c7c0804dd08a5fc4c3e0b
- https://git.kernel.org/stable/c/78e397a43e1c47321a4679cc49a6c4530bf820b9
- https://git.kernel.org/stable/c/7dfe23659f3677c08a60a0056cda2d91a79c15ca
- https://git.kernel.org/stable/c/82fb41c5de243e7dfa90f32ca58e35adaff56c1d
- https://git.kernel.org/stable/c/d34c30442d5e53a33cde79ca163320dbe2432cbd
- https://git.kernel.org/stable/c/e1e04cc2ef2c0c0866c19f5627149a76c2baae32
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53559.json
- https://nvd.nist.gov/vuln/detail/CVE-2023-53559