CVE-2022-50536

bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data

State: Published
Severity: 7.8 High
Published: Oct 7, 2025
Updated: Aug 5, 2026
Reserved: Oct 7, 2025

Description

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

bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data

In tcp_bpf_send_verdict() redirection, the eval variable is assigned to __SK_REDIRECT after the apply_bytes data is sent, if msg has more_data, sock_put() will be called multiple times.

We should reset the eval variable to __SK_NONE every time more_data starts.

This causes:

IPv4: Attempt to release TCP socket in state 1 00000000b4c925d7 ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 5 PID: 4482 at lib/refcount.c:25 refcount_warn_saturate+0x7d/0x110 Modules linked in: CPU: 5 PID: 4482 Comm: sockhash_bypass Kdump: loaded Not tainted 6.0.0 #1 Hardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014 Call Trace: <TASK> __tcp_transmit_skb+0xa1b/0xb90 ? __alloc_skb+0x8c/0x1a0 ? __kmalloc_node_track_caller+0x184/0x320 tcp_write_xmit+0x22a/0x1110 __tcp_push_pending_frames+0x32/0xf0 do_tcp_sendpages+0x62d/0x640 tcp_bpf_push+0xae/0x2c0 tcp_bpf_sendmsg_redir+0x260/0x410 ? preempt_count_add+0x70/0xa0 tcp_bpf_send_verdict+0x386/0x4b0 tcp_bpf_sendmsg+0x21b/0x3b0 sock_sendmsg+0x58/0x70 __sys_sendto+0xfa/0x170 ? xfd_validate_state+0x1d/0x80 ? switch_fpu_return+0x59/0xe0 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	5f0bfe21c853917aae4bc5a70fe57ddb4054443e to before 7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10Affected 15dec6d8f8642a26d6a272af2d7f9877df8f02b8 to before 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6Affected cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 8786bde11a4f31b63b3036731df0b47337a7a245Affected cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 578a7628b838a3ac8ad61deaab5a816ff032ac13Affected cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 113236e8f49f262f318c00ebb14b15f4834e87c1Affected cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 7a9841ca025275b5b0edfb0b618934abb6ceec15Affected 6f226ffe4458ea3b8c33287cb8c86f87dc198dceAffected 5.4.157 to before 5.4.229Affected 5.10.77 to before 5.10.163Affected 5.14.16 to before 5.15Affected
LinuxLinux	5.15Affected before 5.15Not affected 5.4.229 through 5.4.Not affected 5.10.163 through 5.10.Not affected 5.15.86 through 5.15.Not affected 6.0.16 through 6.0.Not affected 6.1.2 through 6.1.*Not affected 6.2 and laterNot affected

Product

Versions

LinuxLinux

5f0bfe21c853917aae4bc5a70fe57ddb4054443e to before 7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10Affected
15dec6d8f8642a26d6a272af2d7f9877df8f02b8 to before 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6Affected
cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 8786bde11a4f31b63b3036731df0b47337a7a245Affected
cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 578a7628b838a3ac8ad61deaab5a816ff032ac13Affected
cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 113236e8f49f262f318c00ebb14b15f4834e87c1Affected
cd9733f5d75c94a32544d6ce5be47e14194cf137 to before 7a9841ca025275b5b0edfb0b618934abb6ceec15Affected
6f226ffe4458ea3b8c33287cb8c86f87dc198dceAffected
5.4.157 to before 5.4.229Affected
5.10.77 to before 5.10.163Affected
5.14.16 to before 5.15Affected

LinuxLinux

5.15Affected
before 5.15Not affected
5.4.229 through 5.4.*Not affected
5.10.163 through 5.10.*Not affected
5.15.86 through 5.15.*Not affected
6.0.16 through 6.0.*Not affected
6.1.2 through 6.1.*Not affected
6.2 and laterNot affected

References

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