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CVE-2026-72110

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.217, 6.1.184, 6.6.145, 6.12.97, 6.18.40, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From a10787e6d58c24b51e91c19c6d16c5da89fcaa4b · fixed in 7df67a4799067a59e6a2d53f8059a6be6e73e678; From a10787e6d58c24b51e91c19c6d16c5da89fcaa4b · fixed in aff686efd38728e06daf12417a0d7ed454ce4cff; From a10787e6d58c24b51e91c19c6d16c5da89fcaa4b · fixed in c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74; From a10787e6d58c24b51e91c19c6d16c5da89fcaa4b · fixed in 9cff220ddb65b022cc668bb652200742476e744c; From a10787e6d58c24b51e91c19c6d16c5da89fcaa4b · fixed in c4f626ddf2350652ad2f79daf1f10847f3f6eabd; From a10787e6d58c24b51e91c19c6d16c5da89fcaa4b · fixed in 43f0005f81b8ce3be962d653cde8db9022f1e9b0; From a10787e6d58c24b51e91c19c6d16c5da89fcaa4b · fixed in 9b51a6155d14389876916726430da30eabb1d4ed

  • Linux Linux

    5.13

  • KernelLinux

    From 5.13.0 · fixed in 5.15.217; From 5.16.0 · fixed in 6.1.184; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 7

git.kernel.org