CVE-2026-23001
macvlan: fix possible UAF in macvlan_forward_source()
Reported by linux · Published January 25, 2026
In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/695fb1e8.050a0220.1c677c.039f.GAE@google.com/T/#u
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| bpftool6.12 | Amazon Linux | 1:6.12.68-92.122.amzn2023 |
| kernel6.12-devel | Amazon Linux | 1:6.12.68-92.122.amzn2023 |
| kernel-modules-extra | errata.rockylinux.org | 0:4.18.0-553.111.1.el8_10.x86_64 |
| python3-perf-debuginfo | errata.rockylinux.org | 0:4.18.0-553.111.1.el8_10.x86_64 |
| kernel6.12-libbpf-devel | Amazon Linux | 1:6.12.68-92.122.amzn2023 |
| kernel6.12-modules-extra | Amazon Linux | 1:6.12.68-92.122.amzn2023 |
| bpftool | errata.rockylinux.org | 0:4.18.0-553.111.1.el8_10.x86_64 |
| bpftool-debuginfo | errata.rockylinux.org | 0:4.18.0-553.111.1.el8_10.x86_64, 0:4.18.0-553.111.1.el8_10.aarch64 |
| kernel-debug-devel | errata.rockylinux.org | 0:4.18.0-553.111.1.el8_10.x86_64 |
| kernel-debug-modules-extra | errata.rockylinux.org | 0:4.18.0-553.111.1.el8_10.x86_64, 0:4.18.0-553.111.1.el8_10.aarch64 |
| perf6.12 | Amazon Linux | 1:6.12.68-92.122.amzn2023 |
| kernel-rt-modules-extra | errata.rockylinux.org | 0:4.18.0-553.111.1.rt7.452.el8_10.x86_64 |
32 more packages have a fixed version. See every fix in Lookup.
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 79cf79abce71eb7dbc40e2f3121048ca5405cb47, 79cf79abce71eb7dbc40e2f3121048ca5405cb47, 79cf79abce71eb7dbc40e2f3121048ca5405cb47 |
| Linux | Linux | 3.18, 0, 5.10.249 |
| Linux | Linux | 6.19, 0, 5.10.249 |
| linux | linux_kernel | 3.18, 3.18, 3.18 |
Timeline
- Jan 25, 2026 CVE Published
- Jan 25, 2026 PoC Published (14 in total, the first dated here)
- Jan 26, 2026 EPSS Score (30 in total, the first dated here)
- Jan 30, 2026 Security Advisory (118 in total, the first dated here)
- Mar 22, 2026 Coalition ESS Score (2 in total, the first dated here)
- Mar 23, 2026 Distribution Patch (118 in total, the first dated here)
- Sep 27, 2026 CVE Updated
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