Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-10-09T00:00:00 kernel: bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destroy() 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-125

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destroy() sk_protocol lives in struct sock, not in struct sock_common. A timewait or request sock handed to bpf_sock_destroy() by the tcp iterator is neither, so reading sk->sk_protocol runs past the object: ================================================================== BUG: KASAN: slab-out-of-bounds in bpf_sock_destroy+0xc7/0xe0 Read of size 2 at addr ffff8881047d11b4 by task test_progs/428 Tainted: [W]=WARN Call Trace: <TASK> dump_stack_lvl+0x91/0xf0 print_report+0xd1/0x630 kasan_report+0xf3/0x130 __asan_report_load2_noabort+0x14/0x30 bpf_sock_destroy+0xc7/0xe0 bpf_prog_c3dd61f9d9cd9f37_iter_tcp6_timewait+0x9f/0xb7 bpf_iter_run_prog+0x538/0xde0 bpf_iter_tcp_seq_show+0x26b/0x4b0 bpf_seq_read+0x424/0x1210 vfs_read+0x197/0xe40 ksys_read+0x119/0x240 __x64_sys_read+0x72/0xc0 x64_sys_call+0x647/0x27e0 do_syscall_64+0xe5/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e Only check sk_protocol on full socks. tcp_abort() already knows how to deal with TIME_WAIT and NEW_SYN_RECV socks. Also fix the comment, it never matched the code.

A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. When processing socket destruction requests through the bpf_sock_destroy() helper, the kernel fails to properly verify if a socket is a full socket before attempting to read its protocol field, causing an out-of-bounds memory read. A local user authorized to execute BPF programs can exploit this vulnerability to cause a system crash, resulting in a Denial of Service (DoS), or potentially disclose sensitive kernel memory.

A moderate-impact flaw was found in the Linux kernel BPF subsystem in Red Hat Enterprise Linux 9 and 10, Red Hat In-Vehicle OS 2, and the RHEL CoreOS 9 kernels shipped with OpenShift Container Platform 4.19 and later. The bpf_sock_destroy() BPF helper reads the sk_protocol field, which exists only in the full struct sock, but the TCP BPF iterator can hand it a timewait or request socket, which is based on the smaller struct sock_common. Reading sk_protocol past the end of such an object causes a two-byte slab out-of-bounds read that can crash the kernel, resulting in a denial of service. Exploitation requires local access with authorization to load and execute BPF programs, and the read value is not returned to user space, so Red Hat rates this flaw as Moderate (CVSS 3.1 score 5.5, AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Red Hat Enterprise Linux 7 and 8, the earlier RHEL 9 streams 9.2 and 9.4, and OpenShift Container Platform 4.18 and earlier are not affected because the vulnerable bpf_sock_destroy kfunc is not present in those kernels. For the affected streams the fix is deferred to a future regularly scheduled kernel update; the residual risk is limited to local denial of service by a user who already holds the privileges required to run BPF programs, with no direct information disclosure or privilege escalation demonstrated. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Not affected kernel-rt Red Hat OpenShift Container Platform 4 Not affected openshift/ose-rhel-coreos-8 Red Hat OpenShift Container Platform 4 Fix deferred openshift/ose-rhel-coreos-9 https://www.cve.org/CVERecord?id=CVE-2026-98384 https://nvd.nist.gov/vuln/detail/CVE-2026-98384 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98384.mbox