{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-50409", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50409", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-09-18T16:03:53.902Z", "updatedAt": "2026-05-11T19:18:56.170Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory\n\nFixes the below NULL pointer dereference:\n\n [...]\n [ 14.471200] Call Trace:\n [ 14.471562] \n [ 14.471882] lock_acquire+0x245/0x2e0\n [ 14.472416] ? remove_wait_queue+0x12/0x50\n [ 14.473014] ? _raw_spin_lock_irqsave+0x17/0x50\n [ 14.473681] _raw_spin_lock_irqsave+0x3d/0x50\n [ 14.474318] ? remove_wait_queue+0x12/0x50\n [ 14.474907] remove_wait_queue+0x12/0x50\n [ 14.475480] sk_stream_wait_memory+0x20d/0x340\n [ 14.476127] ? do_wait_intr_irq+0x80/0x80\n [ 14.476704] do_tcp_sendpages+0x287/0x600\n [ 14.477283] tcp_bpf_push+0xab/0x260\n [ 14.477817] tcp_bpf_sendmsg_redir+0x297/0x500\n [ 14.478461] ? __local_bh_enable_ip+0x77/0xe0\n [ 14.479096] tcp_bpf_send_verdict+0x105/0x470\n [ 14.479729] tcp_bpf_sendmsg+0x318/0x4f0\n [ 14.480311] sock_sendmsg+0x2d/0x40\n [ 14.480822] ____sys_sendmsg+0x1b4/0x1c0\n [ 14.481390] ? copy_msghdr_from_user+0x62/0x80\n [ 14.482048] ___sys_sendmsg+0x78/0xb0\n [ 14.482580] ? vmf_insert_pfn_prot+0x91/0x150\n [ 14.483215] ? __do_fault+0x2a/0x1a0\n [ 14.483738] ? do_fault+0x15e/0x5d0\n [ 14.484246] ? __handle_mm_fault+0x56b/0x1040\n [ 14.484874] ? lock_is_held_type+0xdf/0x130\n [ 14.485474] ? find_held_lock+0x2d/0x90\n [ 14.486046] ? __sys_sendmsg+0x41/0x70\n [ 14.486587] __sys_sendmsg+0x41/0x70\n [ 14.487105] ? intel_pmu_drain_pebs_core+0x350/0x350\n [ 14.487822] do_syscall_64+0x34/0x80\n [ 14.488345] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n\nThe test scenario has the following flow:\n\nthread1 thread2\n----------- ---------------\n tcp_bpf_sendmsg\n tcp_bpf_send_verdict\n tcp_bpf_sendmsg_redir sock_close\n tcp_bpf_push_locked __sock_release\n tcp_bpf_push //inet_release\n do_tcp_sendpages sock->ops->release\n sk_stream_wait_memory \t // tcp_close\n sk_wait_event sk->sk_prot->close\n release_sock(__sk);\n ***\n lock_sock(sk);\n __tcp_close\n sock_orphan(sk)\n sk->sk_wq = NULL\n release_sock\n ****\n lock_sock(__sk);\n remove_wait_queue(sk_sleep(sk), &wait);\n sk_sleep(sk)\n //NULL pointer dereference\n &rcu_dereference_raw(sk->sk_wq)->wait\n\nWhile waiting for memory in thread1, the socket is released with its wait\nqueue because thread2 has closed it. This caused by tcp_bpf_send_verdict\ndidn't increase the f_count of psock->sk_redir->sk_socket->file in thread1.\n\nWe should check if SOCK_DEAD flag is set on wakeup in sk_stream_wait_memory\nbefore accessing the wait queue.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "a76462dbdd8bddcbeec9463bc9e54e509b860762" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "65029aaedd15d9fe5ea1a899134e236d83f627bb" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "124b7c773271f06af5a2cea694b283cdb5275cf5" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "35f5e70bdfa7432762ac4ffa75e5a7574ac5563e" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "435f5aa4421782af197b98d8525263977be4af5c" }, { "version": "604326b41a6fb9b4a78b6179335decee0365cd8c", "status": "affected", "versionType": "git", "lessThan": "3f8ef65af927db247418d4e1db49164d7a158fc5" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.220", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.150", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.75", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.19.17", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.19.*" }, { "version": "6.0.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }