{ "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-2024-26725", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-26725", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-04-03T14:55:24.074Z", "updatedAt": "2026-05-11T20:02:56.186Z", "importedAt": "2026-10-24T01:57:07.518Z", "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": "dpll: fix possible deadlock during netlink dump operation", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix possible deadlock during netlink dump operation\n\nRecently, I've been hitting following deadlock warning during dpll pin\ndump:\n\n[52804.637962] ======================================================\n[52804.638536] WARNING: possible circular locking dependency detected\n[52804.639111] 6.8.0-rc2jiri+ #1 Not tainted\n[52804.639529] ------------------------------------------------------\n[52804.640104] python3/2984 is trying to acquire lock:\n[52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: netlink_dump+0xb3/0x780\n[52804.641417]\n but task is already holding lock:\n[52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, at: dpll_lock_dumpit+0x13/0x20\n[52804.642747]\n which lock already depends on the new lock.\n\n[52804.643551]\n the existing dependency chain (in reverse order) is:\n[52804.644259]\n -> #1 (dpll_lock){+.+.}-{3:3}:\n[52804.644836] lock_acquire+0x174/0x3e0\n[52804.645271] __mutex_lock+0x119/0x1150\n[52804.645723] dpll_lock_dumpit+0x13/0x20\n[52804.646169] genl_start+0x266/0x320\n[52804.646578] __netlink_dump_start+0x321/0x450\n[52804.647056] genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.647575] genl_rcv_msg+0x1ed/0x3b0\n[52804.648001] netlink_rcv_skb+0xdc/0x210\n[52804.648440] genl_rcv+0x24/0x40\n[52804.648831] netlink_unicast+0x2f1/0x490\n[52804.649290] netlink_sendmsg+0x36d/0x660\n[52804.649742] __sock_sendmsg+0x73/0xc0\n[52804.650165] __sys_sendto+0x184/0x210\n[52804.650597] __x64_sys_sendto+0x72/0x80\n[52804.651045] do_syscall_64+0x6f/0x140\n[52804.651474] entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.652001]\n -> #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}:\n[52804.652650] check_prev_add+0x1ae/0x1280\n[52804.653107] __lock_acquire+0x1ed3/0x29a0\n[52804.653559] lock_acquire+0x174/0x3e0\n[52804.653984] __mutex_lock+0x119/0x1150\n[52804.654423] netlink_dump+0xb3/0x780\n[52804.654845] __netlink_dump_start+0x389/0x450\n[52804.655321] genl_family_rcv_msg_dumpit+0x155/0x1e0\n[52804.655842] genl_rcv_msg+0x1ed/0x3b0\n[52804.656272] netlink_rcv_skb+0xdc/0x210\n[52804.656721] genl_rcv+0x24/0x40\n[52804.657119] netlink_unicast+0x2f1/0x490\n[52804.657570] netlink_sendmsg+0x36d/0x660\n[52804.658022] __sock_sendmsg+0x73/0xc0\n[52804.658450] __sys_sendto+0x184/0x210\n[52804.658877] __x64_sys_sendto+0x72/0x80\n[52804.659322] do_syscall_64+0x6f/0x140\n[52804.659752] entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[52804.660281]\n other info that might help us debug this:\n\n[52804.661077] Possible unsafe locking scenario:\n\n[52804.661671] CPU0 CPU1\n[52804.662129] ---- ----\n[52804.662577] lock(dpll_lock);\n[52804.662924] lock(nlk_cb_mutex-GENERIC);\n[52804.663538] lock(dpll_lock);\n[52804.664073] lock(nlk_cb_mutex-GENERIC);\n[52804.664490]\n\nThe issue as follows: __netlink_dump_start() calls control->start(cb)\nwith nlk->cb_mutex held. In control->start(cb) the dpll_lock is taken.\nThen nlk->cb_mutex is released and taken again in netlink_dump(), while\ndpll_lock still being held. That leads to ABBA deadlock when another\nCPU races with the same operation.\n\nFix this by moving dpll_lock taking into dumpit() callback which ensures\ncorrect lock taking order.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc", "status": "affected", "versionType": "git", "lessThan": "087739cbd0d0b87b6cec2c0799436ac66e24acc8" }, { "version": "9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc", "status": "affected", "versionType": "git", "lessThan": "53c0441dd2c44ee93fddb5473885fd41e4bc2361" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.7", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.7" }, { "version": "6.7.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.7.*" }, { "version": "6.8", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }