CVE-2026-72110

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf,fork: wipe ->bpf_storage before bailouts that access it

Currently, copy_process() can bail out to free_task() before p->bpf_storage has been initialized, with this call graph (shown here for the !CONFIG_MEMCG case):

copy_process dup_task_struct arch_dup_task_struct [copies the entire task_struct, including ->bpf_storage member] [RLIMIT_NPROC check fails] delayed_free_task free_task bpf_task_storage_free rcu_dereference(task->bpf_storage) bpf_local_storage_destroy

In this case, the nascent task's ->bpf_storage member that bpf_local_storage_destroy() operates on is a plain copy of the parent's ->bpf_storage pointer, not a real initialized pointer. This leads to badness (kernel hangs, UAF).

This is reachable as long as the process calling fork() has been inserted into a task storage map.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa10787e6d58c24b51e91c19c6d16c5da89fcaa4b < c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74affected
LinuxLinuxa10787e6d58c24b51e91c19c6d16c5da89fcaa4b < 9cff220ddb65b022cc668bb652200742476e744caffected
LinuxLinuxa10787e6d58c24b51e91c19c6d16c5da89fcaa4b < c4f626ddf2350652ad2f79daf1f10847f3f6eabdaffected
LinuxLinuxa10787e6d58c24b51e91c19c6d16c5da89fcaa4b < 43f0005f81b8ce3be962d653cde8db9022f1e9b0affected
LinuxLinuxa10787e6d58c24b51e91c19c6d16c5da89fcaa4b < 9b51a6155d14389876916726430da30eabb1d4edaffected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References