Local kernel memory corruption via netns teardown race
Published Jun 24, 2026 · Updated Jun 24, 2026
Use-after-free in Linux Kernel 4.16 through 7.0.9 allows local users to trigger unsafe memory access during BPF offload information queries. The bpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns() paths call get_net() after the associated netns refcount reaches zero during concurrent namespace teardown. Triggering requires a local low-privileged user to query an offloaded BPF map or program during that race, producing a kernel use-after-free.
Summary
What happened
Use-after-free in Linux Kernel 4.16 through 7.0.9 allows local users to trigger unsafe memory access during BPF offload information queries. The bpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns() paths call get_net() after the associated netns refcount reaches zero during concurrent namespace teardown. Triggering requires a local low-privileged user to query an offloaded BPF map or program during that race, producing a kernel use-after-free.
The record
- CVE
- CVE-2026-53089
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 24, 2026CVE publishedPublication date reported by the CVE source.
- Jun 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=4.16
- Affected versionversion=675fc275a3a2d905535207237402c6d8dcb5fa4b <a0c584fc18056709c8e047a82a6045d6c209f4ce
- Affected versionversion=675fc275a3a2d905535207237402c6d8dcb5fa4b <a51e7fbe94a87e236631a83973d4f558310b2cd2
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Published CVSS scores
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Attacks
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Technologies
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