CVE-2026-63828

CVE CVE-2026-63828EUVD EUVD-2026-45494Published 2026-07-19T12:02:22.000ZLast changed 2026-08-05T12:36:11.000ZCVSS 8.4

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: apparmor: mediate the implicit connect of TCP fast open sendmsg sendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and write(2): it opens the connection in the SYN. apparmor_socket_sendmsg() only checks AA_MAY_SEND, so a profile that grants send but denies connect lets a confined task open an outbound TCP/MPTCP connection that connect(2) would have refused, bypassing connect mediation. Mediate the implicit connect when MSG_FASTOPEN is set and a destination is supplied. Add it to apparmor_socket_sendmsg() (not the shared aa_sock_msg_perm() helper, which recvmsg also uses) and call aa_sk_perm() directly, mirroring the selinux and tomoyo fixes. sk_is_tcp() does not cover MPTCP fast open, so the SOCK_STREAM/IPPROTO_MPTCP arm is explicit.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.2-rc1; cf60af03ca4e71134206809ea892e49b92a88896 <4a69b83045d3195d5b9a9b053ad840ddb2998b4e; cf60af03ca4e71134206809ea892e49b92a88896 <7f57428ce00891d26b0f087ef754a4d820ec83aa; patch: 6.1.177; patch: 5.10.261; patch: 6.18.38; 3.6; patch: 6.6.144; cf60af03ca4e71134206809ea892e49b92a88896 <faea60deaa05c76f0772650f42eafde12bd39d93; cf60af03ca4e71134206809ea892e49b92a88896 <4d587cd8a72155089a627130bbd4716ec0856e21; patch: 6.12.95; patch: 7.1.3; cf60af03ca4e71134206809ea892e49b92a88896 <a16714e7cf2baa98ba2efddd5d6cbac641f4e76b; cf60af03ca4e71134206809ea892e49b92a88896 <07b71c342382b854ab8030b244aeab6a7228ad7d; cf60af03ca4e71134206809ea892e49b92a88896 <45ebb934ea50b436ce49b2f159f090dab0d7fa28; cf60af03ca4e71134206809ea892e49b92a88896 <20383429b56974507c465d016e5238b189f7a246; patch: 0; patch: 5.15.212

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

Does this concern one of your customers?

This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.

Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.