{"id":"DEBIAN-CVE-2022-50536","details":"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:  \u003cTASK\u003e  __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","modified":"2026-09-01T16:05:35.702127459Z","published":"2025-10-07T16:15:37.810Z","upstream":["CVE-2022-50536"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-50536"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50536.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50536.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50536.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}