CVE-2022-50536: bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data
Vulnerability summary
CVE-2022-50536 is a high (CVSS 7.8) Double Free vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 1Timeline
- 07-10-2025PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
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
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.17% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu116 products
- linux< 5.4.0-144.161 | < 5.15.0-69.76
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.4.0-1097.105 | < 5.15.0-1033.37
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 5f0bfe21c853917aae4bc5a70fe57ddb4054443e, < 7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10 | ≥ 15dec6d8f8642a26d6a272af2d7f9877df8f02b8, < 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6 | ≥ cd9733f5d75c94a32544d6ce5be47e14194cf137, < 8786bde11a4f31b63b3036731df0b47337a7a245 | ≥ cd9733f5d75c94a32544d6ce5be47e14194cf137, < 578a7628b838a3ac8ad61deaab5a816ff032ac13 | ≥ cd9733f5d75c94a32544d6ce5be47e14194cf137, < 113236e8f49f262f318c00ebb14b15f4834e87c1 | ≥ cd9733f5d75c94a32544d6ce5be47e14194cf137, < 7a9841ca025275b5b0edfb0b618934abb6ceec15 | 6f226ffe4458ea3b8c33287cb8c86f87dc198dce | ≥ 5.4.157, < 5.4.229 | ≥ 5.10.77, < 5.10.163 | ≥ 5.14.16, < 5.15 | 5.15
- linux_kernel≥ 5.4.157, < 5.4.229 | ≥ 5.10.77, < 5.10.163 | ≥ 5.14.16, < 5.15 | ≥ 5.15.1, < 5.15.86 | ≥ 5.16, < 6.0.16 | ≥ 6.1, < 6.1.2 | 5.15
Debian1 product
- linux< 6.1.4-1
3 vendors · 119 products
