In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix KASAN use-after-free Read in compute_effective_progs
Syzbot found a Use After Free bug in compute_effective_progs(). The reproducer creates a number of BPF links, and causes a fault injected alloc to fail, while calling bpf_link_detach on them. Link detach triggers the link to be freed by bpf_link_free(), which calls __cgroup_bpf_detach() and update_effective_progs(). If the memory allocation in this function fails, the function restores the pointer to the bpf_cgroup_link on the cgroup list, but the memory gets freed just after it returns. After this, every subsequent call to update_effective_progs() causes this already deallocated pointer to be dereferenced in prog_list_length(), and triggers KASAN UAF error.
To fix this issue don't preserve the pointer to the prog or link in the list, but remove it and replace it with a dummy prog without shrinking the table. The subsequent call to __cgroup_bpf_detach() or __cgroup_bpf_detach() will correct it.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-livepatch-5.15.69-37.134Upgrade bpftool-debuginfoUpgrade python-perfUpgrade perfUpgrade kernelUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-livepatch-5.10.144-127.601Upgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-devel | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools-libsUpgrade bpftool | Oct 24, 2025 | Oct 23, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 18, 2025 |
| Ubuntu | — | Upgrade linux-gcpUpgrade linux-gkeopUpgrade linux-oracle-5.15Upgrade linux-kvmUpgrade linux-ibmUpgrade linuxUpgrade linux-intel-iotgUpgrade linux-oracleUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-nvidiaUpgrade linux-realtimeUpgrade linux-raspiUpgrade linux-aws-5.15Upgrade linux-gcp-5.15Upgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-azure-fdeUpgrade linux-azureUpgrade linux-riscv-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-awsUpgrade linux-lowlatency | Jun 26, 2025 | Jun 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 18, 2025 |
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