CVE-2021-47419

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47419
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_taprio: properly cancel timer from taprio_destroy() There is a comment in qdisc_create() about us not calling ops->reset() in some cases. err_out4: /* * Any broken qdiscs that would require a ops->reset() here? * The qdisc was never in action so it shouldn't be necessary. */ As taprio sets a timer before actually receiving a packet, we need to cancel it from ops->destroy, just in case ops->reset has not been called. syzbot reported: ODEBUG: free active (active state 0) object type: hrtimer hint: advance_sched+0x0/0x9a0 arch/x86/include/asm/atomic64_64.h:22 WARNING: CPU: 0 PID: 8441 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 0 PID: 8441 Comm: syz-executor813 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd e0 d3 e3 89 4c 89 ee 48 c7 c7 e0 c7 e3 89 e8 5b 86 11 05 <0f> 0b 83 05 85 03 92 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc9000130f330 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff88802baeb880 RSI: ffffffff815d87b5 RDI: fffff52000261e58 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815d25ee R11: 0000000000000000 R12: ffffffff898dd020 R13: ffffffff89e3ce20 R14: ffffffff81653630 R15: dffffc0000000000 FS: 0000000000f0d300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb64b3e000 CR3: 0000000036557000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:987 [inline] debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1603 [inline] slab_free_freelist_hook+0x171/0x240 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kfree+0xe4/0x540 mm/slub.c:4267 qdisc_create+0xbcf/0x1320 net/sched/sch_api.c:1299 tc_modify_qdisc+0x4c8/0x1a60 net/sched/sch_api.c:1663 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866 Patch
https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75 Patch
https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0 Patch
https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc Patch
https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866 Patch
https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75 Patch
https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0 Patch
https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
History

25 Sep 2025, 16:09

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866 - () https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866 - Patch
References () https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75 - () https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75 - Patch
References () https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0 - () https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0 - Patch
References () https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc - () https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc - Patch
CWE NVD-CWE-noinfo
First Time Linux linux Kernel
Linux

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866 - () https://git.kernel.org/stable/c/3ec73ffeef54596c32aff0e73fe60971b9c8b866 -
References () https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75 - () https://git.kernel.org/stable/c/7a1c1af341041221b3acb9d7036cc2b43e0efa75 -
References () https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0 - () https://git.kernel.org/stable/c/a56d447f196fa9973c568f54c0d76d5391c3b0c0 -
References () https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc - () https://git.kernel.org/stable/c/c951c08a5996365aecbc5f1a9bddec3905e1ddfc -

01 Nov 2024, 15:35

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/sched: sch_taprio: cancelar correctamente el temporizador de taprio_destroy(). Hay un comentario en qdisc_create() acerca de que no llamamos a ops-&gt;reset() en algunos casos. err_out4: /* * ¿Alguna qdisc rota que requiera un ops-&gt;reset() aquí? * La qdisc nunca estuvo en acción por lo que no debería ser necesaria. */ Como taprio establece un temporizador antes de recibir un paquete, debemos cancelarlo desde ops-&gt;destroy, en caso de que no se haya llamado a ops-&gt;reset. syzbot informó: ODEBUG: libre activo (estado activo 0) tipo de objeto: hrtimer sugerencia: advanced_sched+0x0/0x9a0 arch/x86/include/asm/atomic64_64.h:22 ADVERTENCIA: CPU: 0 PID: 8441 en lib/debugobjects.c :505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Módulos vinculados en: CPU: 0 PID: 8441 Comm: syz-executor813 No contaminado 5.14.0-rc6-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Motor, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Código: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd e0 d3 e3 89 4c 89 ee 48 c7 c7 e0 c7 e3 89 e8 5b 86 11 05 &lt;0f&gt; 0b 83 05 85 03 92 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP 0018:ffff c9000130f330 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 00000000000000003 RCX: 0000000000000000 RDX: ffff88802baeb880 RSI: ffffffff815d87b5 RDI: fffff52000261e58 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815d25ee R11: 00000000000000000 R12: ffffffff898dd020 R13: 3ce20 R14: ffffffff81653630 R15: dffffc0000000000 FS: 0000000000f0d300( 0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb64b3e000 CR3: 557000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 7: 0000000000000400 Seguimiento de llamadas: __debug_check_no_obj_freed lib/debugobjects.c:987 [en línea] debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1603 [en línea] slab_free_freelist_hook+0x171/0x240 mm/ slub.c:1653 slab_libre mm/slub.c:3213 [en línea] kfree+0xe4/0x540 mm/slub.c:4267 qdisc_create+0xbcf/0x1320 net/sched/sch_api.c:1299 tc_modify_qdisc+0x4c8/0x1a60 net/sched/sch_api.c:1663 rtnetlink_rcv_msg+0x413/0xb80 nore/rtnetlink.c: 5571 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c: 2504 netlink_unicast_kernel net/netlink/af_netlink.c: 1314 [netlin /0x7d0 net/netlink/ af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [en línea] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net /zócalo .c:2403 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486 do_syscall_x64 arch/x86/entry/common.c:50 [en línea] arco/ x86/entrada/common.c:80

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2025-09-25 16:09

NVD link : CVE-2021-47419

Mitre link : CVE-2021-47419

CVE.ORG link : CVE-2021-47419

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo