CVE-2026-72110
Description
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.
How to fix
- Linux Linux7df67a4799067a59e6a2d53f8059a6be6e73e678, aff686efd38728e06daf12417a0d7ed454ce4cff, c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74, 9cff220ddb65b022cc668bb652200742476e744c, c4f626ddf2350652ad2f79daf1f10847f3f6eabd, 43f0005f81b8ce3be962d653cde8db9022f1e9b0, 9b51a6155d14389876916726430da30eabb1d4ed or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | a10787e6d58c24b51e91c19c6d16c5da89fcaa4b ≤ v < 7df67a4799067a59e6a2d53f8059a6be6e73e678, a10787e6d58c24b51e91c19c6d16c5da89fcaa4b ≤ v < aff686efd38728e06daf12417a0d7ed454ce4cff, a10787e6d58c24b51e91c19c6d16c5da89fcaa4b ≤ v < c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74, a10787e6d58c24b51e91c19c6d16c5da89fcaa4b ≤ v < 9cff220ddb65b022cc668bb652200742476e744c, a10787e6d58c24b51e91c19c6d16c5da89fcaa4b ≤ v < c4f626ddf2350652ad2f79daf1f10847f3f6eabd, a10787e6d58c24b51e91c19c6d16c5da89fcaa4b ≤ v < 43f0005f81b8ce3be962d653cde8db9022f1e9b0, a10787e6d58c24b51e91c19c6d16c5da89fcaa4b ≤ v < 9b51a6155d14389876916726430da30eabb1d4ed, 5.13 | 7df67a4799067a59e6a2d53f8059a6be6e73e678, aff686efd38728e06daf12417a0d7ed454ce4cff, c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74, 9cff220ddb65b022cc668bb652200742476e744c, c4f626ddf2350652ad2f79daf1f10847f3f6eabd, 43f0005f81b8ce3be962d653cde8db9022f1e9b0, 9b51a6155d14389876916726430da30eabb1d4ed |
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