CVE-2024-26725 (GCVE-0-2024-26725)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:55 – Updated: 2025-05-04 08:54
VLAI?
Title
dpll: fix possible deadlock during netlink dump operation
Summary
In the Linux kernel, the following vulnerability has been resolved: dpll: fix possible deadlock during netlink dump operation Recently, I've been hitting following deadlock warning during dpll pin dump: [52804.637962] ====================================================== [52804.638536] WARNING: possible circular locking dependency detected [52804.639111] 6.8.0-rc2jiri+ #1 Not tainted [52804.639529] ------------------------------------------------------ [52804.640104] python3/2984 is trying to acquire lock: [52804.640581] ffff88810e642678 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}, at: netlink_dump+0xb3/0x780 [52804.641417] but task is already holding lock: [52804.642010] ffffffff83bde4c8 (dpll_lock){+.+.}-{3:3}, at: dpll_lock_dumpit+0x13/0x20 [52804.642747] which lock already depends on the new lock. [52804.643551] the existing dependency chain (in reverse order) is: [52804.644259] -> #1 (dpll_lock){+.+.}-{3:3}: [52804.644836] lock_acquire+0x174/0x3e0 [52804.645271] __mutex_lock+0x119/0x1150 [52804.645723] dpll_lock_dumpit+0x13/0x20 [52804.646169] genl_start+0x266/0x320 [52804.646578] __netlink_dump_start+0x321/0x450 [52804.647056] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.647575] genl_rcv_msg+0x1ed/0x3b0 [52804.648001] netlink_rcv_skb+0xdc/0x210 [52804.648440] genl_rcv+0x24/0x40 [52804.648831] netlink_unicast+0x2f1/0x490 [52804.649290] netlink_sendmsg+0x36d/0x660 [52804.649742] __sock_sendmsg+0x73/0xc0 [52804.650165] __sys_sendto+0x184/0x210 [52804.650597] __x64_sys_sendto+0x72/0x80 [52804.651045] do_syscall_64+0x6f/0x140 [52804.651474] entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.652001] -> #0 (nlk_cb_mutex-GENERIC){+.+.}-{3:3}: [52804.652650] check_prev_add+0x1ae/0x1280 [52804.653107] __lock_acquire+0x1ed3/0x29a0 [52804.653559] lock_acquire+0x174/0x3e0 [52804.653984] __mutex_lock+0x119/0x1150 [52804.654423] netlink_dump+0xb3/0x780 [52804.654845] __netlink_dump_start+0x389/0x450 [52804.655321] genl_family_rcv_msg_dumpit+0x155/0x1e0 [52804.655842] genl_rcv_msg+0x1ed/0x3b0 [52804.656272] netlink_rcv_skb+0xdc/0x210 [52804.656721] genl_rcv+0x24/0x40 [52804.657119] netlink_unicast+0x2f1/0x490 [52804.657570] netlink_sendmsg+0x36d/0x660 [52804.658022] __sock_sendmsg+0x73/0xc0 [52804.658450] __sys_sendto+0x184/0x210 [52804.658877] __x64_sys_sendto+0x72/0x80 [52804.659322] do_syscall_64+0x6f/0x140 [52804.659752] entry_SYSCALL_64_after_hwframe+0x46/0x4e [52804.660281] other info that might help us debug this: [52804.661077] Possible unsafe locking scenario: [52804.661671] CPU0 CPU1 [52804.662129] ---- ---- [52804.662577] lock(dpll_lock); [52804.662924] lock(nlk_cb_mutex-GENERIC); [52804.663538] lock(dpll_lock); [52804.664073] lock(nlk_cb_mutex-GENERIC); [52804.664490] The issue as follows: __netlink_dump_start() calls control->start(cb) with nlk->cb_mutex held. In control->start(cb) the dpll_lock is taken. Then nlk->cb_mutex is released and taken again in netlink_dump(), while dpll_lock still being held. That leads to ABBA deadlock when another CPU races with the same operation. Fix this by moving dpll_lock taking into dumpit() callback which ensures correct lock taking order.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc , < 087739cbd0d0b87b6cec2c0799436ac66e24acc8 (git)
Affected: 9d71b54b65b1fb6c0d3a6c5c88ba9b915c783fbc , < 53c0441dd2c44ee93fddb5473885fd41e4bc2361 (git)
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    Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix possible deadlock during netlink dump operation\n\nRecently, I\u0027ve 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               -\u003e #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               -\u003e #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-\u003estart(cb)\nwith nlk-\u003ecb_mutex held. In control-\u003estart(cb) the dpll_lock is taken.\nThen nlk-\u003ecb_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."
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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               -\u003e #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               -\u003e #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-\u003estart(cb)\\nwith nlk-\u003ecb_mutex held. In control-\u003estart(cb) the dpll_lock is taken.\\nThen nlk-\u003ecb_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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.6\", \"versionStartIncluding\": \"6.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:54:58.551Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26725\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:54:58.551Z\", \"dateReserved\": \"2024-02-19T14:20:24.163Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T14:55:24.074Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.