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.
CVSS Details
- CVSS 3.1 Base Score: 8.4
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool6.18Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.18-modules-extra-commonUpgrade python3-perf6.18Upgrade kernel6.18Upgrade kernel6.18-modules-extraUpgrade kernel6.18-debuginfo-common-aarch64Upgrade microvm-kernel6.18Upgrade kernel-livepatch-6.18.38-73.137Upgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-tools-develUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18-debuginfoUpgrade kernel6.18-develUpgrade perf6.18Upgrade kernel6.18-tools | Aug 10, 2026 | Jul 19, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Jul 20, 2026 | Jul 20, 2026 |
| Ubuntu | — | Upgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-7.0.0-31-genericUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-awsUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-azure-7.0Upgrade linux-image-generic-7.0Upgrade linux-image-6.8.0-1035-nvidia-tegraUpgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-nvidia-64kUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-gcpUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-generic-64k-7.0Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-aws-64kUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-raspi-7.0Upgrade linux-image-oracle-64kUpgrade linux-image-azureUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-raspi-realtimeUpgrade linux-image-realtimeUpgrade linux-image-oem-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-generic-64kUpgrade linux-image-virtualUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-ibmUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-6.8.0-1035-nvidia-tegra-rtUpgrade linux-image-azure-lts-26.04Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-7.0.0-1014-azureUpgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-oem-26.04bUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-genericUpgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-oem-26.04aUpgrade linux-image-gke-64kUpgrade linux-image-gkeUpgrade linux-image-oracle-7.0Upgrade linux-image-oracleUpgrade linux-image-virtual-7.0Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-ibm-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-realtime-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-gke-7.0Upgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-nvidia-tegraUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-aws-64k-7.0Upgrade linux-image-nvidia-bosUpgrade linux-image-nvidia | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 27, 2026 | Jul 19, 2026 |
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