Bug 2454319 (CVE-2026-23412) - CVE-2026-23412 kernel: netfilter: bpf: defer hook memory release until rcu readers are done
Summary: CVE-2026-23412 kernel: netfilter: bpf: defer hook memory release until rcu re...
Keywords:
Status: NEW
Alias: CVE-2026-23412
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-02 12:02 UTC by OSIDB Bzimport
Modified: 2026-04-02 21:30 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-04-02 12:02:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netfilter: bpf: defer hook memory release until rcu readers are done

Yiming Qian reports UaF when concurrent process is dumping hooks via
nfnetlink_hooks:

BUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0
Read of size 8 at addr ffff888003edbf88 by task poc/79
Call Trace:
 <TASK>
 nfnl_hook_dump_one.isra.0+0xe71/0x10f0
 netlink_dump+0x554/0x12b0
 nfnl_hook_get+0x176/0x230
 [..]

Defer release until after concurrent readers have completed.
Comment 1 Jon Moroney 2026-04-02 21:28:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040201-CVE-2026-23412-4daa@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.