CVE-2021-47402 (GCVE-0-2021-47402)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-11 13:53
VLAI
Title
net: sched: flower: protect fl_walk() with rcu
Summary
In the Linux kernel, the following vulnerability has been resolved: net: sched: flower: protect fl_walk() with rcu Patch that refactored fl_walk() to use idr_for_each_entry_continue_ul() also removed rcu protection of individual filters which causes following use-after-free when filter is deleted concurrently. Fix fl_walk() to obtain rcu read lock while iterating and taking the filter reference and temporary release the lock while calling arg->fn() callback that can sleep. KASAN trace: [ 352.773640] ================================================================== [ 352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower] [ 352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987 [ 352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2 [ 352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 352.781022] Call Trace: [ 352.781573] dump_stack_lvl+0x46/0x5a [ 352.782332] print_address_description.constprop.0+0x1f/0x140 [ 352.783400] ? fl_walk+0x159/0x240 [cls_flower] [ 352.784292] ? fl_walk+0x159/0x240 [cls_flower] [ 352.785138] kasan_report.cold+0x83/0xdf [ 352.785851] ? fl_walk+0x159/0x240 [cls_flower] [ 352.786587] kasan_check_range+0x145/0x1a0 [ 352.787337] fl_walk+0x159/0x240 [cls_flower] [ 352.788163] ? fl_put+0x10/0x10 [cls_flower] [ 352.789007] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.790102] tcf_chain_dump+0x231/0x450 [ 352.790878] ? tcf_chain_tp_delete_empty+0x170/0x170 [ 352.791833] ? __might_sleep+0x2e/0xc0 [ 352.792594] ? tfilter_notify+0x170/0x170 [ 352.793400] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.794477] tc_dump_tfilter+0x385/0x4b0 [ 352.795262] ? tc_new_tfilter+0x1180/0x1180 [ 352.796103] ? __mod_node_page_state+0x1f/0xc0 [ 352.796974] ? __build_skb_around+0x10e/0x130 [ 352.797826] netlink_dump+0x2c0/0x560 [ 352.798563] ? netlink_getsockopt+0x430/0x430 [ 352.799433] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.800542] __netlink_dump_start+0x356/0x440 [ 352.801397] rtnetlink_rcv_msg+0x3ff/0x550 [ 352.802190] ? tc_new_tfilter+0x1180/0x1180 [ 352.802872] ? rtnl_calcit.isra.0+0x1f0/0x1f0 [ 352.803668] ? tc_new_tfilter+0x1180/0x1180 [ 352.804344] ? _copy_from_iter_nocache+0x800/0x800 [ 352.805202] ? kasan_set_track+0x1c/0x30 [ 352.805900] netlink_rcv_skb+0xc6/0x1f0 [ 352.806587] ? rht_deferred_worker+0x6b0/0x6b0 [ 352.807455] ? rtnl_calcit.isra.0+0x1f0/0x1f0 [ 352.808324] ? netlink_ack+0x4d0/0x4d0 [ 352.809086] ? netlink_deliver_tap+0x62/0x3d0 [ 352.809951] netlink_unicast+0x353/0x480 [ 352.810744] ? netlink_attachskb+0x430/0x430 [ 352.811586] ? __alloc_skb+0xd7/0x200 [ 352.812349] netlink_sendmsg+0x396/0x680 [ 352.813132] ? netlink_unicast+0x480/0x480 [ 352.813952] ? __import_iovec+0x192/0x210 [ 352.814759] ? netlink_unicast+0x480/0x480 [ 352.815580] sock_sendmsg+0x6c/0x80 [ 352.816299] ____sys_sendmsg+0x3a5/0x3c0 [ 352.817096] ? kernel_sendmsg+0x30/0x30 [ 352.817873] ? __ia32_sys_recvmmsg+0x150/0x150 [ 352.818753] ___sys_sendmsg+0xd8/0x140 [ 352.819518] ? sendmsg_copy_msghdr+0x110/0x110 [ 352.820402] ? ___sys_recvmsg+0xf4/0x1a0 [ 352.821110] ? __copy_msghdr_from_user+0x260/0x260 [ 352.821934] ? _raw_spin_lock+0x81/0xd0 [ 352.822680] ? __handle_mm_fault+0xef3/0x1b20 [ 352.823549] ? rb_insert_color+0x2a/0x270 [ 352.824373] ? copy_page_range+0x16b0/0x16b0 [ 352.825209] ? perf_event_update_userpage+0x2d0/0x2d0 [ 352.826190] ? __fget_light+0xd9/0xf0 [ 352.826941] __sys_sendmsg+0xb3/0x130 [ 352.827613] ? __sys_sendmsg_sock+0x20/0x20 [ 352.828377] ? do_user_addr_fault+0x2c5/0x8a0 [ 352.829184] ? fpregs_assert_state_consistent+0x52/0x60 [ 352.830001] ? exit_to_user_mode_prepare+0x32/0x160 [ 352.830845] do_syscall_64+0x35/0x80 [ 352.831445] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 352.832331] RIP: 0033:0x7f7bee973c17 [ ---truncated---
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < 694b0cee7f8546b69a80996a29cb3cf4149c0453 (git)
Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < d0d520c19e7ea19ed38dc5797b12397b6ccf9f88 (git)
Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < dab4677bdbffa5c8270e79e34e51c89efa0728a0 (git)
Affected: d39d714969cda5cbda291402c8c6b1fb1047f42e , < d5ef190693a7d76c5c192d108e8dec48307b46ee (git)
Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.151 , ≤ 5.4.* (semver)
Unaffected: 5.10.71 , ≤ 5.10.* (semver)
Unaffected: 5.14.10 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: flower: protect fl_walk() with rcu\n\nPatch that refactored fl_walk() to use idr_for_each_entry_continue_ul()\nalso removed rcu protection of individual filters which causes following\nuse-after-free when filter is deleted concurrently. Fix fl_walk() to obtain\nrcu read lock while iterating and taking the filter reference and temporary\nrelease the lock while calling arg-\u003efn() callback that can sleep.\n\nKASAN trace:\n\n[  352.773640] ==================================================================\n[  352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower]\n[  352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987\n\n[  352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2\n[  352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[  352.781022] Call Trace:\n[  352.781573]  dump_stack_lvl+0x46/0x5a\n[  352.782332]  print_address_description.constprop.0+0x1f/0x140\n[  352.783400]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.784292]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.785138]  kasan_report.cold+0x83/0xdf\n[  352.785851]  ? fl_walk+0x159/0x240 [cls_flower]\n[  352.786587]  kasan_check_range+0x145/0x1a0\n[  352.787337]  fl_walk+0x159/0x240 [cls_flower]\n[  352.788163]  ? fl_put+0x10/0x10 [cls_flower]\n[  352.789007]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.790102]  tcf_chain_dump+0x231/0x450\n[  352.790878]  ? tcf_chain_tp_delete_empty+0x170/0x170\n[  352.791833]  ? __might_sleep+0x2e/0xc0\n[  352.792594]  ? tfilter_notify+0x170/0x170\n[  352.793400]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.794477]  tc_dump_tfilter+0x385/0x4b0\n[  352.795262]  ? tc_new_tfilter+0x1180/0x1180\n[  352.796103]  ? __mod_node_page_state+0x1f/0xc0\n[  352.796974]  ? __build_skb_around+0x10e/0x130\n[  352.797826]  netlink_dump+0x2c0/0x560\n[  352.798563]  ? netlink_getsockopt+0x430/0x430\n[  352.799433]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\n[  352.800542]  __netlink_dump_start+0x356/0x440\n[  352.801397]  rtnetlink_rcv_msg+0x3ff/0x550\n[  352.802190]  ? tc_new_tfilter+0x1180/0x1180\n[  352.802872]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\n[  352.803668]  ? tc_new_tfilter+0x1180/0x1180\n[  352.804344]  ? _copy_from_iter_nocache+0x800/0x800\n[  352.805202]  ? kasan_set_track+0x1c/0x30\n[  352.805900]  netlink_rcv_skb+0xc6/0x1f0\n[  352.806587]  ? rht_deferred_worker+0x6b0/0x6b0\n[  352.807455]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\n[  352.808324]  ? netlink_ack+0x4d0/0x4d0\n[  352.809086]  ? netlink_deliver_tap+0x62/0x3d0\n[  352.809951]  netlink_unicast+0x353/0x480\n[  352.810744]  ? netlink_attachskb+0x430/0x430\n[  352.811586]  ? __alloc_skb+0xd7/0x200\n[  352.812349]  netlink_sendmsg+0x396/0x680\n[  352.813132]  ? netlink_unicast+0x480/0x480\n[  352.813952]  ? __import_iovec+0x192/0x210\n[  352.814759]  ? netlink_unicast+0x480/0x480\n[  352.815580]  sock_sendmsg+0x6c/0x80\n[  352.816299]  ____sys_sendmsg+0x3a5/0x3c0\n[  352.817096]  ? kernel_sendmsg+0x30/0x30\n[  352.817873]  ? __ia32_sys_recvmmsg+0x150/0x150\n[  352.818753]  ___sys_sendmsg+0xd8/0x140\n[  352.819518]  ? sendmsg_copy_msghdr+0x110/0x110\n[  352.820402]  ? ___sys_recvmsg+0xf4/0x1a0\n[  352.821110]  ? __copy_msghdr_from_user+0x260/0x260\n[  352.821934]  ? _raw_spin_lock+0x81/0xd0\n[  352.822680]  ? __handle_mm_fault+0xef3/0x1b20\n[  352.823549]  ? rb_insert_color+0x2a/0x270\n[  352.824373]  ? copy_page_range+0x16b0/0x16b0\n[  352.825209]  ? perf_event_update_userpage+0x2d0/0x2d0\n[  352.826190]  ? __fget_light+0xd9/0xf0\n[  352.826941]  __sys_sendmsg+0xb3/0x130\n[  352.827613]  ? __sys_sendmsg_sock+0x20/0x20\n[  352.828377]  ? do_user_addr_fault+0x2c5/0x8a0\n[  352.829184]  ? fpregs_assert_state_consistent+0x52/0x60\n[  352.830001]  ? exit_to_user_mode_prepare+0x32/0x160\n[  352.830845]  do_syscall_64+0x35/0x80\n[  352.831445]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[  352.832331] RIP: 0033:0x7f7bee973c17\n[ \n---truncated---"
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          "url": "https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47402",
    "datePublished": "2024-05-21T15:03:56.690Z",
    "dateReserved": "2024-05-21T14:58:30.816Z",
    "dateUpdated": "2026-05-11T13:53:59.768Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2021-47402",
      "date": "2026-06-16",
      "epss": "0.00244",
      "percentile": "0.15331"
    },
    "fkie_nvd": {
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: sched: flower: protect fl_walk() with rcu\\n\\nPatch that refactored fl_walk() to use idr_for_each_entry_continue_ul()\\nalso removed rcu protection of individual filters which causes following\\nuse-after-free when filter is deleted concurrently. Fix fl_walk() to obtain\\nrcu read lock while iterating and taking the filter reference and temporary\\nrelease the lock while calling arg-\u003efn() callback that can sleep.\\n\\nKASAN trace:\\n\\n[  352.773640] ==================================================================\\n[  352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower]\\n[  352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987\\n\\n[  352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2\\n[  352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\\n[  352.781022] Call Trace:\\n[  352.781573]  dump_stack_lvl+0x46/0x5a\\n[  352.782332]  print_address_description.constprop.0+0x1f/0x140\\n[  352.783400]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.784292]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.785138]  kasan_report.cold+0x83/0xdf\\n[  352.785851]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.786587]  kasan_check_range+0x145/0x1a0\\n[  352.787337]  fl_walk+0x159/0x240 [cls_flower]\\n[  352.788163]  ? fl_put+0x10/0x10 [cls_flower]\\n[  352.789007]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.790102]  tcf_chain_dump+0x231/0x450\\n[  352.790878]  ? tcf_chain_tp_delete_empty+0x170/0x170\\n[  352.791833]  ? __might_sleep+0x2e/0xc0\\n[  352.792594]  ? tfilter_notify+0x170/0x170\\n[  352.793400]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.794477]  tc_dump_tfilter+0x385/0x4b0\\n[  352.795262]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.796103]  ? __mod_node_page_state+0x1f/0xc0\\n[  352.796974]  ? __build_skb_around+0x10e/0x130\\n[  352.797826]  netlink_dump+0x2c0/0x560\\n[  352.798563]  ? netlink_getsockopt+0x430/0x430\\n[  352.799433]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.800542]  __netlink_dump_start+0x356/0x440\\n[  352.801397]  rtnetlink_rcv_msg+0x3ff/0x550\\n[  352.802190]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.802872]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\\n[  352.803668]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.804344]  ? _copy_from_iter_nocache+0x800/0x800\\n[  352.805202]  ? kasan_set_track+0x1c/0x30\\n[  352.805900]  netlink_rcv_skb+0xc6/0x1f0\\n[  352.806587]  ? rht_deferred_worker+0x6b0/0x6b0\\n[  352.807455]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\\n[  352.808324]  ? netlink_ack+0x4d0/0x4d0\\n[  352.809086]  ? netlink_deliver_tap+0x62/0x3d0\\n[  352.809951]  netlink_unicast+0x353/0x480\\n[  352.810744]  ? netlink_attachskb+0x430/0x430\\n[  352.811586]  ? __alloc_skb+0xd7/0x200\\n[  352.812349]  netlink_sendmsg+0x396/0x680\\n[  352.813132]  ? netlink_unicast+0x480/0x480\\n[  352.813952]  ? __import_iovec+0x192/0x210\\n[  352.814759]  ? netlink_unicast+0x480/0x480\\n[  352.815580]  sock_sendmsg+0x6c/0x80\\n[  352.816299]  ____sys_sendmsg+0x3a5/0x3c0\\n[  352.817096]  ? kernel_sendmsg+0x30/0x30\\n[  352.817873]  ? __ia32_sys_recvmmsg+0x150/0x150\\n[  352.818753]  ___sys_sendmsg+0xd8/0x140\\n[  352.819518]  ? sendmsg_copy_msghdr+0x110/0x110\\n[  352.820402]  ? ___sys_recvmsg+0xf4/0x1a0\\n[  352.821110]  ? __copy_msghdr_from_user+0x260/0x260\\n[  352.821934]  ? _raw_spin_lock+0x81/0xd0\\n[  352.822680]  ? __handle_mm_fault+0xef3/0x1b20\\n[  352.823549]  ? rb_insert_color+0x2a/0x270\\n[  352.824373]  ? copy_page_range+0x16b0/0x16b0\\n[  352.825209]  ? perf_event_update_userpage+0x2d0/0x2d0\\n[  352.826190]  ? __fget_light+0xd9/0xf0\\n[  352.826941]  __sys_sendmsg+0xb3/0x130\\n[  352.827613]  ? __sys_sendmsg_sock+0x20/0x20\\n[  352.828377]  ? do_user_addr_fault+0x2c5/0x8a0\\n[  352.829184]  ? fpregs_assert_state_consistent+0x52/0x60\\n[  352.830001]  ? exit_to_user_mode_prepare+0x32/0x160\\n[  352.830845]  do_syscall_64+0x35/0x80\\n[  352.831445]  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n[  352.832331] RIP: 0033:0x7f7bee973c17\\n[ \\n---truncated---\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: net: sched: flower: protege fl_walk() con rcu. El parche que refactoriz\\u00f3 fl_walk() para usar idr_for_each_entry_continue_ul() tambi\\u00e9n elimin\\u00f3 la protecci\\u00f3n de rcu de filtros individuales que provoca el siguiente use after free. cuando el filtro se elimina simult\\u00e1neamente. Se corrige fl_walk() para obtener el bloqueo de lectura de rcu mientras se itera y se toma la referencia del filtro y se libera temporalmente el bloqueo mientras se llama a la devoluci\\u00f3n de llamada arg-\u0026gt;fn() que puede dormir. Seguimiento de KASAN: [352.773640] ============================================= ========================== [352.775041] ERROR: KASAN: use-after-free en fl_walk+0x159/0x240 [cls_flower] [352.776304] Lectura de tama\\u00f1o 4 en addr ffff8881c8251480 por tarea tc/2987 [ 352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2 [ 352.778980] Nombre de hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13 .0-0-gf21b5a4aeb02-prebuilt.qemu.org 01/04/2014 [352.781022] Seguimiento de llamadas: [352.781573] dump_stack_lvl+0x46/0x5a [352.782332] print_address_description.constprop.0+0x1f/0x140 [ 352.783400] ? fl_walk+0x159/0x240 [cls_flower] [ 352.784292] ? fl_walk+0x159/0x240 [cls_flower] [ 352.785138] kasan_report.cold+0x83/0xdf [ 352.785851] ? fl_walk+0x159/0x240 [cls_flower] [ 352.786587] kasan_check_range+0x145/0x1a0 [ 352.787337] fl_walk+0x159/0x240 [cls_flower] [ 352.788163] ? fl_put+0x10/0x10 [cls_flower] [ 352.789007] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [352.790102] tcf_chain_dump+0x231/0x450 [352.790878]? tcf_chain_tp_delete_empty+0x170/0x170 [352.791833]? __might_sleep+0x2e/0xc0 [ 352.792594] ? tfilter_notify+0x170/0x170 [352.793400]? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [352.794477] tc_dump_tfilter+0x385/0x4b0 [352.795262]? tc_new_tfilter+0x1180/0x1180 [352.796103]? __mod_node_page_state+0x1f/0xc0 [352.796974]? __build_skb_around+0x10e/0x130 [ 352.797826] netlink_dump+0x2c0/0x560 [ 352.798563] ? netlink_getsockopt+0x430/0x430 [352.799433]? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.800542] __netlink_dump_start+0x356/0x440 [ 352.801397] rtnetlink_rcv_msg+0x3ff/0x550 [ 352.802190] ? tc_new_tfilter+0x1180/0x1180 [352.802872]? rtnl_calcit.isra.0+0x1f0/0x1f0 [ 352.803668] ? tc_new_tfilter+0x1180/0x1180 [352.804344]? _copy_from_iter_nocache+0x800/0x800 [352.805202]? kasan_set_track+0x1c/0x30 [ 352.805900] netlink_rcv_skb+0xc6/0x1f0 [ 352.806587] ? rht_deferred_worker+0x6b0/0x6b0 [352.807455]? rtnl_calcit.isra.0+0x1f0/0x1f0 [352.808324]? netlink_ack+0x4d0/0x4d0 [352.809086]? netlink_deliver_tap+0x62/0x3d0 [352.809951] netlink_unicast+0x353/0x480 [352.810744]? netlink_attachskb+0x430/0x430 [352.811586]? __alloc_skb+0xd7/0x200 [ 352.812349] netlink_sendmsg+0x396/0x680 [ 352.813132] ? netlink_unicast+0x480/0x480 [352.813952]? __import_iovec+0x192/0x210 [352.814759]? netlink_unicast+0x480/0x480 [352.815580] sock_sendmsg+0x6c/0x80 [352.816299] ____sys_sendmsg+0x3a5/0x3c0 [352.817096] ? kernel_sendmsg+0x30/0x30 [352.817873]? __ia32_sys_recvmmsg+0x150/0x150 [ 352.818753] ___sys_sendmsg+0xd8/0x140 [ 352.819518] ? sendmsg_copy_msghdr+0x110/0x110 [352.820402]? ___sys_recvmsg+0xf4/0x1a0 [352.821110]? __copy_msghdr_from_user+0x260/0x260 [352.821934]? _raw_spin_lock+0x81/0xd0 [352.822680]? __handle_mm_fault+0xef3/0x1b20 [352.823549]? rb_insert_color+0x2a/0x270 [352.824373]? copy_page_range+0x16b0/0x16b0 [352.825209]? perf_event_update_userpage+0x2d0/0x2d0 [352.826190]? __fget_light+0xd9/0xf0 [ 352.826941] __sys_sendmsg+0xb3/0x130 [ 352.827613] ? __sys_sendmsg_sock+0x20/0x20 [352.828377]? do_user_addr_fault+0x2c5/0x8a0 [352.829184]? fpregs_assert_state_consistent+0x52/0x60 [352.830001]? exit_to_user_mode_prepare+0x32/0x160 [ 352.830845] do_syscall_64+0x35/0x80 [ 352.831445] Entry_SYSCALL_64_after_hwframe+0x44/0xae [ 352.832331] RIP: 0033:0x7f7bee973c1 7 [ ---truncado---\"}]",
      "id": "CVE-2021-47402",
      "lastModified": "2024-11-21T06:36:04.283",
      "published": "2024-05-21T15:15:25.690",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Undergoing Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47402\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:25.690\",\"lastModified\":\"2025-01-14T17:29:04.687\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: sched: flower: protect fl_walk() with rcu\\n\\nPatch that refactored fl_walk() to use idr_for_each_entry_continue_ul()\\nalso removed rcu protection of individual filters which causes following\\nuse-after-free when filter is deleted concurrently. Fix fl_walk() to obtain\\nrcu read lock while iterating and taking the filter reference and temporary\\nrelease the lock while calling arg-\u003efn() callback that can sleep.\\n\\nKASAN trace:\\n\\n[  352.773640] ==================================================================\\n[  352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower]\\n[  352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987\\n\\n[  352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2\\n[  352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\\n[  352.781022] Call Trace:\\n[  352.781573]  dump_stack_lvl+0x46/0x5a\\n[  352.782332]  print_address_description.constprop.0+0x1f/0x140\\n[  352.783400]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.784292]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.785138]  kasan_report.cold+0x83/0xdf\\n[  352.785851]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.786587]  kasan_check_range+0x145/0x1a0\\n[  352.787337]  fl_walk+0x159/0x240 [cls_flower]\\n[  352.788163]  ? fl_put+0x10/0x10 [cls_flower]\\n[  352.789007]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.790102]  tcf_chain_dump+0x231/0x450\\n[  352.790878]  ? tcf_chain_tp_delete_empty+0x170/0x170\\n[  352.791833]  ? __might_sleep+0x2e/0xc0\\n[  352.792594]  ? tfilter_notify+0x170/0x170\\n[  352.793400]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.794477]  tc_dump_tfilter+0x385/0x4b0\\n[  352.795262]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.796103]  ? __mod_node_page_state+0x1f/0xc0\\n[  352.796974]  ? __build_skb_around+0x10e/0x130\\n[  352.797826]  netlink_dump+0x2c0/0x560\\n[  352.798563]  ? netlink_getsockopt+0x430/0x430\\n[  352.799433]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.800542]  __netlink_dump_start+0x356/0x440\\n[  352.801397]  rtnetlink_rcv_msg+0x3ff/0x550\\n[  352.802190]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.802872]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\\n[  352.803668]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.804344]  ? _copy_from_iter_nocache+0x800/0x800\\n[  352.805202]  ? kasan_set_track+0x1c/0x30\\n[  352.805900]  netlink_rcv_skb+0xc6/0x1f0\\n[  352.806587]  ? rht_deferred_worker+0x6b0/0x6b0\\n[  352.807455]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\\n[  352.808324]  ? netlink_ack+0x4d0/0x4d0\\n[  352.809086]  ? netlink_deliver_tap+0x62/0x3d0\\n[  352.809951]  netlink_unicast+0x353/0x480\\n[  352.810744]  ? netlink_attachskb+0x430/0x430\\n[  352.811586]  ? __alloc_skb+0xd7/0x200\\n[  352.812349]  netlink_sendmsg+0x396/0x680\\n[  352.813132]  ? netlink_unicast+0x480/0x480\\n[  352.813952]  ? __import_iovec+0x192/0x210\\n[  352.814759]  ? netlink_unicast+0x480/0x480\\n[  352.815580]  sock_sendmsg+0x6c/0x80\\n[  352.816299]  ____sys_sendmsg+0x3a5/0x3c0\\n[  352.817096]  ? kernel_sendmsg+0x30/0x30\\n[  352.817873]  ? __ia32_sys_recvmmsg+0x150/0x150\\n[  352.818753]  ___sys_sendmsg+0xd8/0x140\\n[  352.819518]  ? sendmsg_copy_msghdr+0x110/0x110\\n[  352.820402]  ? ___sys_recvmsg+0xf4/0x1a0\\n[  352.821110]  ? __copy_msghdr_from_user+0x260/0x260\\n[  352.821934]  ? _raw_spin_lock+0x81/0xd0\\n[  352.822680]  ? __handle_mm_fault+0xef3/0x1b20\\n[  352.823549]  ? rb_insert_color+0x2a/0x270\\n[  352.824373]  ? copy_page_range+0x16b0/0x16b0\\n[  352.825209]  ? perf_event_update_userpage+0x2d0/0x2d0\\n[  352.826190]  ? __fget_light+0xd9/0xf0\\n[  352.826941]  __sys_sendmsg+0xb3/0x130\\n[  352.827613]  ? __sys_sendmsg_sock+0x20/0x20\\n[  352.828377]  ? do_user_addr_fault+0x2c5/0x8a0\\n[  352.829184]  ? fpregs_assert_state_consistent+0x52/0x60\\n[  352.830001]  ? exit_to_user_mode_prepare+0x32/0x160\\n[  352.830845]  do_syscall_64+0x35/0x80\\n[  352.831445]  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n[  352.832331] RIP: 0033:0x7f7bee973c17\\n[ \\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: sched: flower: protege fl_walk() con rcu. El parche que refactoriz\u00f3 fl_walk() para usar idr_for_each_entry_continue_ul() tambi\u00e9n elimin\u00f3 la protecci\u00f3n de rcu de filtros individuales que provoca el siguiente use after free. cuando el filtro se elimina simult\u00e1neamente. Se corrige fl_walk() para obtener el bloqueo de lectura de rcu mientras se itera y se toma la referencia del filtro y se libera temporalmente el bloqueo mientras se llama a la devoluci\u00f3n de llamada arg-\u0026gt;fn() que puede dormir. Seguimiento de KASAN: [352.773640] ============================================= ========================== [352.775041] ERROR: KASAN: use-after-free en fl_walk+0x159/0x240 [cls_flower] [352.776304] Lectura de tama\u00f1o 4 en addr ffff8881c8251480 por tarea tc/2987 [ 352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2 [ 352.778980] Nombre de hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13 .0-0-gf21b5a4aeb02-prebuilt.qemu.org 01/04/2014 [352.781022] Seguimiento de llamadas: [352.781573] dump_stack_lvl+0x46/0x5a [352.782332] print_address_description.constprop.0+0x1f/0x140 [ 352.783400] ? fl_walk+0x159/0x240 [cls_flower] [ 352.784292] ? fl_walk+0x159/0x240 [cls_flower] [ 352.785138] kasan_report.cold+0x83/0xdf [ 352.785851] ? fl_walk+0x159/0x240 [cls_flower] [ 352.786587] kasan_check_range+0x145/0x1a0 [ 352.787337] fl_walk+0x159/0x240 [cls_flower] [ 352.788163] ? fl_put+0x10/0x10 [cls_flower] [ 352.789007] ? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [352.790102] tcf_chain_dump+0x231/0x450 [352.790878]? tcf_chain_tp_delete_empty+0x170/0x170 [352.791833]? __might_sleep+0x2e/0xc0 [ 352.792594] ? tfilter_notify+0x170/0x170 [352.793400]? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [352.794477] tc_dump_tfilter+0x385/0x4b0 [352.795262]? tc_new_tfilter+0x1180/0x1180 [352.796103]? __mod_node_page_state+0x1f/0xc0 [352.796974]? __build_skb_around+0x10e/0x130 [ 352.797826] netlink_dump+0x2c0/0x560 [ 352.798563] ? netlink_getsockopt+0x430/0x430 [352.799433]? __mutex_unlock_slowpath.constprop.0+0x220/0x220 [ 352.800542] __netlink_dump_start+0x356/0x440 [ 352.801397] rtnetlink_rcv_msg+0x3ff/0x550 [ 352.802190] ? tc_new_tfilter+0x1180/0x1180 [352.802872]? rtnl_calcit.isra.0+0x1f0/0x1f0 [ 352.803668] ? tc_new_tfilter+0x1180/0x1180 [352.804344]? _copy_from_iter_nocache+0x800/0x800 [352.805202]? kasan_set_track+0x1c/0x30 [ 352.805900] netlink_rcv_skb+0xc6/0x1f0 [ 352.806587] ? rht_deferred_worker+0x6b0/0x6b0 [352.807455]? rtnl_calcit.isra.0+0x1f0/0x1f0 [352.808324]? netlink_ack+0x4d0/0x4d0 [352.809086]? netlink_deliver_tap+0x62/0x3d0 [352.809951] netlink_unicast+0x353/0x480 [352.810744]? netlink_attachskb+0x430/0x430 [352.811586]? __alloc_skb+0xd7/0x200 [ 352.812349] netlink_sendmsg+0x396/0x680 [ 352.813132] ? netlink_unicast+0x480/0x480 [352.813952]? __import_iovec+0x192/0x210 [352.814759]? netlink_unicast+0x480/0x480 [352.815580] sock_sendmsg+0x6c/0x80 [352.816299] ____sys_sendmsg+0x3a5/0x3c0 [352.817096] ? kernel_sendmsg+0x30/0x30 [352.817873]? __ia32_sys_recvmmsg+0x150/0x150 [ 352.818753] ___sys_sendmsg+0xd8/0x140 [ 352.819518] ? sendmsg_copy_msghdr+0x110/0x110 [352.820402]? ___sys_recvmsg+0xf4/0x1a0 [352.821110]? __copy_msghdr_from_user+0x260/0x260 [352.821934]? _raw_spin_lock+0x81/0xd0 [352.822680]? __handle_mm_fault+0xef3/0x1b20 [352.823549]? rb_insert_color+0x2a/0x270 [352.824373]? copy_page_range+0x16b0/0x16b0 [352.825209]? perf_event_update_userpage+0x2d0/0x2d0 [352.826190]? __fget_light+0xd9/0xf0 [ 352.826941] __sys_sendmsg+0xb3/0x130 [ 352.827613] ? __sys_sendmsg_sock+0x20/0x20 [352.828377]? do_user_addr_fault+0x2c5/0x8a0 [352.829184]? fpregs_assert_state_consistent+0x52/0x60 [352.830001]? exit_to_user_mode_prepare+0x32/0x160 [ 352.830845] do_syscall_64+0x35/0x80 [ 352.831445] Entry_SYSCALL_64_after_hwframe+0x44/0xae [ 352.832331] RIP: 0033:0x7f7bee973c1 7 [ ---truncado---\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3\",\"versionEndExcluding\":\"5.4.151\",\"matchCriteriaId\":\"C11443A3-881A-4C77-84D2-DEC0F4B10883\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.71\",\"matchCriteriaId\":\"60C740E4-6C54-40CD-A914-2232D8FC781D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.14.10\",\"matchCriteriaId\":\"1A437B0D-8305-4C72-B691-D26986A126CF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"E46C74C6-B76B-4C94-A6A4-FD2FFF62D644\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"60134C3A-06E4-48C1-B04F-2903732A4E56\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"0460DA88-8FE1-46A2-9DDA-1F1ABA552E71\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:58.958Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47402\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:38:07.154281Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:18.156Z\"}}], \"cna\": {\"title\": \"net: sched: flower: protect fl_walk() with rcu\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d39d714969cda5cbda291402c8c6b1fb1047f42e\", \"lessThan\": \"694b0cee7f8546b69a80996a29cb3cf4149c0453\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d39d714969cda5cbda291402c8c6b1fb1047f42e\", \"lessThan\": \"d0d520c19e7ea19ed38dc5797b12397b6ccf9f88\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d39d714969cda5cbda291402c8c6b1fb1047f42e\", \"lessThan\": \"dab4677bdbffa5c8270e79e34e51c89efa0728a0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d39d714969cda5cbda291402c8c6b1fb1047f42e\", \"lessThan\": \"d5ef190693a7d76c5c192d108e8dec48307b46ee\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sched/cls_flower.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.151\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.71\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/cls_flower.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/694b0cee7f8546b69a80996a29cb3cf4149c0453\"}, {\"url\": \"https://git.kernel.org/stable/c/d0d520c19e7ea19ed38dc5797b12397b6ccf9f88\"}, {\"url\": \"https://git.kernel.org/stable/c/dab4677bdbffa5c8270e79e34e51c89efa0728a0\"}, {\"url\": \"https://git.kernel.org/stable/c/d5ef190693a7d76c5c192d108e8dec48307b46ee\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: sched: flower: protect fl_walk() with rcu\\n\\nPatch that refactored fl_walk() to use idr_for_each_entry_continue_ul()\\nalso removed rcu protection of individual filters which causes following\\nuse-after-free when filter is deleted concurrently. Fix fl_walk() to obtain\\nrcu read lock while iterating and taking the filter reference and temporary\\nrelease the lock while calling arg-\u003efn() callback that can sleep.\\n\\nKASAN trace:\\n\\n[  352.773640] ==================================================================\\n[  352.775041] BUG: KASAN: use-after-free in fl_walk+0x159/0x240 [cls_flower]\\n[  352.776304] Read of size 4 at addr ffff8881c8251480 by task tc/2987\\n\\n[  352.777862] CPU: 3 PID: 2987 Comm: tc Not tainted 5.15.0-rc2+ #2\\n[  352.778980] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\\n[  352.781022] Call Trace:\\n[  352.781573]  dump_stack_lvl+0x46/0x5a\\n[  352.782332]  print_address_description.constprop.0+0x1f/0x140\\n[  352.783400]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.784292]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.785138]  kasan_report.cold+0x83/0xdf\\n[  352.785851]  ? fl_walk+0x159/0x240 [cls_flower]\\n[  352.786587]  kasan_check_range+0x145/0x1a0\\n[  352.787337]  fl_walk+0x159/0x240 [cls_flower]\\n[  352.788163]  ? fl_put+0x10/0x10 [cls_flower]\\n[  352.789007]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.790102]  tcf_chain_dump+0x231/0x450\\n[  352.790878]  ? tcf_chain_tp_delete_empty+0x170/0x170\\n[  352.791833]  ? __might_sleep+0x2e/0xc0\\n[  352.792594]  ? tfilter_notify+0x170/0x170\\n[  352.793400]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.794477]  tc_dump_tfilter+0x385/0x4b0\\n[  352.795262]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.796103]  ? __mod_node_page_state+0x1f/0xc0\\n[  352.796974]  ? __build_skb_around+0x10e/0x130\\n[  352.797826]  netlink_dump+0x2c0/0x560\\n[  352.798563]  ? netlink_getsockopt+0x430/0x430\\n[  352.799433]  ? __mutex_unlock_slowpath.constprop.0+0x220/0x220\\n[  352.800542]  __netlink_dump_start+0x356/0x440\\n[  352.801397]  rtnetlink_rcv_msg+0x3ff/0x550\\n[  352.802190]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.802872]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\\n[  352.803668]  ? tc_new_tfilter+0x1180/0x1180\\n[  352.804344]  ? _copy_from_iter_nocache+0x800/0x800\\n[  352.805202]  ? kasan_set_track+0x1c/0x30\\n[  352.805900]  netlink_rcv_skb+0xc6/0x1f0\\n[  352.806587]  ? rht_deferred_worker+0x6b0/0x6b0\\n[  352.807455]  ? rtnl_calcit.isra.0+0x1f0/0x1f0\\n[  352.808324]  ? netlink_ack+0x4d0/0x4d0\\n[  352.809086]  ? netlink_deliver_tap+0x62/0x3d0\\n[  352.809951]  netlink_unicast+0x353/0x480\\n[  352.810744]  ? netlink_attachskb+0x430/0x430\\n[  352.811586]  ? __alloc_skb+0xd7/0x200\\n[  352.812349]  netlink_sendmsg+0x396/0x680\\n[  352.813132]  ? netlink_unicast+0x480/0x480\\n[  352.813952]  ? __import_iovec+0x192/0x210\\n[  352.814759]  ? netlink_unicast+0x480/0x480\\n[  352.815580]  sock_sendmsg+0x6c/0x80\\n[  352.816299]  ____sys_sendmsg+0x3a5/0x3c0\\n[  352.817096]  ? kernel_sendmsg+0x30/0x30\\n[  352.817873]  ? __ia32_sys_recvmmsg+0x150/0x150\\n[  352.818753]  ___sys_sendmsg+0xd8/0x140\\n[  352.819518]  ? sendmsg_copy_msghdr+0x110/0x110\\n[  352.820402]  ? ___sys_recvmsg+0xf4/0x1a0\\n[  352.821110]  ? __copy_msghdr_from_user+0x260/0x260\\n[  352.821934]  ? _raw_spin_lock+0x81/0xd0\\n[  352.822680]  ? __handle_mm_fault+0xef3/0x1b20\\n[  352.823549]  ? rb_insert_color+0x2a/0x270\\n[  352.824373]  ? copy_page_range+0x16b0/0x16b0\\n[  352.825209]  ? perf_event_update_userpage+0x2d0/0x2d0\\n[  352.826190]  ? __fget_light+0xd9/0xf0\\n[  352.826941]  __sys_sendmsg+0xb3/0x130\\n[  352.827613]  ? __sys_sendmsg_sock+0x20/0x20\\n[  352.828377]  ? do_user_addr_fault+0x2c5/0x8a0\\n[  352.829184]  ? fpregs_assert_state_consistent+0x52/0x60\\n[  352.830001]  ? exit_to_user_mode_prepare+0x32/0x160\\n[  352.830845]  do_syscall_64+0x35/0x80\\n[  352.831445]  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n[  352.832331] RIP: 0033:0x7f7bee973c17\\n[ \\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.151\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.71\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.10\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"5.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:10:13.449Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47402\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:10:13.449Z\", \"dateReserved\": \"2024-05-21T14:58:30.816Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:03:56.690Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.