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 bpftool-debuginfoUpgrade bpftoolUpgrade python-perfUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernel-livepatch-4.14.238-182.421Upgrade kernel-headersUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade python-perf-debuginfoUpgrade perfUpgrade perf-debuginfoUpgrade kernel-tools | May 21, 2025 | May 21, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade python3-perfUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernelUpgrade kernel-abi-stablelists | Oct 8, 2024 | May 21, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernel | Oct 8, 2024 | May 21, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-raspiUpgrade linux-fipsUpgrade linux-aws-5.4Upgrade linux-oracle-5.4Upgrade linux-aws-hweUpgrade linuxUpgrade linux-bluefieldUpgrade linux-raspi-5.4Upgrade linux-oracleUpgrade linux-gkeopUpgrade linux-gcpUpgrade linux-gcp-fipsUpgrade linux-azure-fipsUpgrade linux-hwe-5.4Upgrade linux-hweUpgrade linux-azure-5.4Upgrade linux-azure-4.15Upgrade linux-aws-fipsUpgrade linux-azureUpgrade linux-awsUpgrade linux-gcp-4.15Upgrade linux-kvmUpgrade linux-gcp-5.4 | Nov 19, 2024 | May 21, 2024 |
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