{"id":"AZL-55203","summary":"CVE-2024-56694 affecting package kernel for versions less than 5.15.176.3-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix recursive lock when verdict program return SK_PASS\n\nWhen the stream_verdict program returns SK_PASS, it places the received skb\ninto its own receive queue, but a recursive lock eventually occurs, leading\nto an operating system deadlock. This issue has been present since v6.9.\n\n'''\nsk_psock_strp_data_ready\n    write_lock_bh(&sk-\u003esk_callback_lock)\n    strp_data_ready\n      strp_read_sock\n        read_sock -\u003e tcp_read_sock\n          strp_recv\n            cb.rcv_msg -\u003e sk_psock_strp_read\n              # now stream_verdict return SK_PASS without peer sock assign\n              __SK_PASS = sk_psock_map_verd(SK_PASS, NULL)\n              sk_psock_verdict_apply\n                sk_psock_skb_ingress_self\n                  sk_psock_skb_ingress_enqueue\n                    sk_psock_data_ready\n                      read_lock_bh(&sk-\u003esk_callback_lock) \u003c= dead lock\n\n'''\n\nThis topic has been discussed before, but it has not been fixed.\nPrevious discussion:\nhttps://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch","modified":"2026-04-01T05:18:31.932911Z","published":"2024-12-28T10:15:15Z","upstream":["CVE-2024-56694"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56694"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:2","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.176.3-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-55203.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}