CVE-2026-53089
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free in offloaded map/prog info fill When querying info for an offloaded BPF map or program, bpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns() obtain the network namespace with get_net(dev_net(offmap->netdev)). However, the associated netdev's netns may be racing with teardown during netns destruction. If the netns refcount has already reached 0, get_net() performs a refcount_t increment on 0, triggering: refcount_t: addition on 0; use-after-free. Although rtnl_lock and bpf_devs_lock ensure the netdev pointer remains valid, they cannot prevent the netns refcount from reaching zero. Fix this by using maybe_get_net() instead of get_net(). maybe_get_net() uses refcount_inc_not_zero() and returns NULL if the refcount is already zero, which causes ns_get_path_cb() to fail and the caller to return -ENOENT -- the correct behavior when the netns is being destroyed.
- Published Jun 24, 2026
- CVSS 7.8 high
- 0.1% chance of exploitation in the next 30 days (EPSS)
- A fix is available
Affected software
In the news
- Multiple vulnerabilities in the Debian Linux kernel CERT-FR ·
- Multiple vulnerabilities in the SUSE Linux kernel CERT-FR ·
- Multiple vulnerabilities in the Ubuntu Linux kernel CERT-FR ·
- Multiple vulnerabilities in the SUSE Linux kernel CERT-FR ·
- Multiple vulnerabilities in the Ubuntu Linux kernel CERT-FR ·
- Multiple vulnerabilities in the Ubuntu Linux kernel CERT-FR ·
- Multiple vulnerabilities in the SUSE Linux kernel CERT-FR ·