In the Linux kernel, the following vulnerability has been resolved:
net: bridge: fix vlan tunnel dst null pointer dereference
This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. When deleting a vlan tunnel the tunnel_dst pointer is set to NULL without waiting a grace period (i.e. while it's still usable) and packets egressing are dereferencing it without checking. Use READ/WRITE_ONCE to annotate the lockless use of tunnel_id, use RCU for accessing tunnel_dst and make sure it is read only once and checked in the egress path. The dst is already properly RCU protected so we don't need to do anything fancy than to make sure tunnel_id and tunnel_dst are read only once and checked in the egress path.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade python-perfUpgrade kernelUpgrade bpftoolUpgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfoUpgrade kernel-livepatch-4.14.238-182.421Upgrade perfUpgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-tools-develUpgrade python-perf-debuginfoUpgrade kernel-devel | May 21, 2025 | May 21, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade python3-perf | Oct 8, 2024 | May 21, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernelUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel-tools | Oct 8, 2024 | May 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-azure-5.4Upgrade linux-gcp-fipsUpgrade linux-hwe-5.4Upgrade linux-kvmUpgrade linux-azure-fipsUpgrade linux-oracleUpgrade linux-gcp-5.4Upgrade linux-awsUpgrade linux-hweUpgrade linux-azureUpgrade linux-gcp-4.15Upgrade linux-azure-4.15Upgrade linux-gkeopUpgrade linux-aws-fipsUpgrade linux-gcpUpgrade linux-bluefieldUpgrade linuxUpgrade linux-oracle-5.4Upgrade linux-fipsUpgrade linux-aws-hweUpgrade linux-aws-5.4Upgrade linux-raspi-5.4Upgrade linux-raspi | Nov 19, 2024 | May 21, 2024 |
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