CVE-2021-47588

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47588
In the Linux kernel, the following vulnerability has been resolved: sit: do not call ipip6_dev_free() from sit_init_net() ipip6_dev_free is sit dev->priv_destructor, already called by register_netdevice() if something goes wrong. Alternative would be to make ipip6_dev_free() robust against multiple invocations, but other drivers do not implement this strategy. syzbot reported: dst_release underflow WARNING: CPU: 0 PID: 5059 at net/core/dst.c:173 dst_release+0xd8/0xe0 net/core/dst.c:173 Modules linked in: CPU: 1 PID: 5059 Comm: syz-executor.4 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dst_release+0xd8/0xe0 net/core/dst.c:173 Code: 4c 89 f2 89 d9 31 c0 5b 41 5e 5d e9 da d5 44 f9 e8 1d 90 5f f9 c6 05 87 48 c6 05 01 48 c7 c7 80 44 99 8b 31 c0 e8 e8 67 29 f9 <0f> 0b eb 85 0f 1f 40 00 53 48 89 fb e8 f7 8f 5f f9 48 83 c3 a8 48 RSP: 0018:ffffc9000aa5faa0 EFLAGS: 00010246 RAX: d6894a925dd15a00 RBX: 00000000ffffffff RCX: 0000000000040000 RDX: ffffc90005e19000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: 0000000000000000 R08: ffffffff816a1f42 R09: ffffed1017344f2c R10: ffffed1017344f2c R11: 0000000000000000 R12: 0000607f462b1358 R13: 1ffffffff1bfd305 R14: ffffe8ffffcb1358 R15: dffffc0000000000 FS: 00007f66c71a2700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f88aaed5058 CR3: 0000000023e0f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> dst_cache_destroy+0x107/0x1e0 net/core/dst_cache.c:160 ipip6_dev_free net/ipv6/sit.c:1414 [inline] sit_init_net+0x229/0x550 net/ipv6/sit.c:1936 ops_init+0x313/0x430 net/core/net_namespace.c:140 setup_net+0x35b/0x9d0 net/core/net_namespace.c:326 copy_net_ns+0x359/0x5c0 net/core/net_namespace.c:470 create_new_namespaces+0x4ce/0xa00 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 ksys_unshare+0x57d/0xb50 kernel/fork.c:3075 __do_sys_unshare kernel/fork.c:3146 [inline] __se_sys_unshare kernel/fork.c:3144 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3144 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f66c882ce99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f66c71a2168 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f66c893ff60 RCX: 00007f66c882ce99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000048040200 RBP: 00007f66c8886ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff6634832f R14: 00007f66c71a2300 R15: 0000000000022000 </TASK>

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/44a6c846bc3a7efe7d394bab8b2ae3b7f580e190 Patch
https://git.kernel.org/stable/c/4e1797914d8f223726ff6ae5ece4f97d73f21bab Patch
https://git.kernel.org/stable/c/6f46c59e60b64620d5d386c8ee2eaa11ebe3b595 Patch
https://git.kernel.org/stable/c/ad0ed314d6167b212939e3839428ba0c8bb16adb Patch
https://git.kernel.org/stable/c/e28587cc491ef0f3c51258fdc87fbc386b1d4c59 Patch
https://git.kernel.org/stable/c/e56b65c1e74d7f706d74b51baba15187be2fb4b5 Patch
https://git.kernel.org/stable/c/44a6c846bc3a7efe7d394bab8b2ae3b7f580e190 Patch
https://git.kernel.org/stable/c/4e1797914d8f223726ff6ae5ece4f97d73f21bab Patch
https://git.kernel.org/stable/c/6f46c59e60b64620d5d386c8ee2eaa11ebe3b595 Patch
https://git.kernel.org/stable/c/ad0ed314d6167b212939e3839428ba0c8bb16adb Patch
https://git.kernel.org/stable/c/e28587cc491ef0f3c51258fdc87fbc386b1d4c59 Patch
https://git.kernel.org/stable/c/e56b65c1e74d7f706d74b51baba15187be2fb4b5 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.12:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.12:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.12:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*
History

01 Oct 2025, 13:42

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:4.12:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.12:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:4.12:rc7:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE NVD-CWE-noinfo
References () https://git.kernel.org/stable/c/44a6c846bc3a7efe7d394bab8b2ae3b7f580e190 - () https://git.kernel.org/stable/c/44a6c846bc3a7efe7d394bab8b2ae3b7f580e190 - Patch
References () https://git.kernel.org/stable/c/4e1797914d8f223726ff6ae5ece4f97d73f21bab - () https://git.kernel.org/stable/c/4e1797914d8f223726ff6ae5ece4f97d73f21bab - Patch
References () https://git.kernel.org/stable/c/6f46c59e60b64620d5d386c8ee2eaa11ebe3b595 - () https://git.kernel.org/stable/c/6f46c59e60b64620d5d386c8ee2eaa11ebe3b595 - Patch
References () https://git.kernel.org/stable/c/ad0ed314d6167b212939e3839428ba0c8bb16adb - () https://git.kernel.org/stable/c/ad0ed314d6167b212939e3839428ba0c8bb16adb - Patch
References () https://git.kernel.org/stable/c/e28587cc491ef0f3c51258fdc87fbc386b1d4c59 - () https://git.kernel.org/stable/c/e28587cc491ef0f3c51258fdc87fbc386b1d4c59 - Patch
References () https://git.kernel.org/stable/c/e56b65c1e74d7f706d74b51baba15187be2fb4b5 - () https://git.kernel.org/stable/c/e56b65c1e74d7f706d74b51baba15187be2fb4b5 - Patch

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/44a6c846bc3a7efe7d394bab8b2ae3b7f580e190 - () https://git.kernel.org/stable/c/44a6c846bc3a7efe7d394bab8b2ae3b7f580e190 -
References () https://git.kernel.org/stable/c/4e1797914d8f223726ff6ae5ece4f97d73f21bab - () https://git.kernel.org/stable/c/4e1797914d8f223726ff6ae5ece4f97d73f21bab -
References () https://git.kernel.org/stable/c/6f46c59e60b64620d5d386c8ee2eaa11ebe3b595 - () https://git.kernel.org/stable/c/6f46c59e60b64620d5d386c8ee2eaa11ebe3b595 -
References () https://git.kernel.org/stable/c/ad0ed314d6167b212939e3839428ba0c8bb16adb - () https://git.kernel.org/stable/c/ad0ed314d6167b212939e3839428ba0c8bb16adb -
References () https://git.kernel.org/stable/c/e28587cc491ef0f3c51258fdc87fbc386b1d4c59 - () https://git.kernel.org/stable/c/e28587cc491ef0f3c51258fdc87fbc386b1d4c59 -
References () https://git.kernel.org/stable/c/e56b65c1e74d7f706d74b51baba15187be2fb4b5 - () https://git.kernel.org/stable/c/e56b65c1e74d7f706d74b51baba15187be2fb4b5 -

20 Jun 2024, 12:43

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sit: no llame a ipip6_dev_free() desde sit_init_net() ipip6_dev_free es sit dev-&gt;priv_destructor, ya llamado por Register_netdevice() si algo sale mal. La alternativa sería hacer que ipip6_dev_free() sea robusto contra múltiples invocaciones, pero otros controladores no implementan esta estrategia. syzbot informó: dst_release underflow ADVERTENCIA: CPU: 0 PID: 5059 en net/core/dst.c:173 dst_release+0xd8/0xe0 net/core/dst.c:173 Módulos vinculados en: CPU: 1 PID: 5059 Comm: syz -executor.4 Not tainted 5.16.0-rc5-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dst_release+0xd8/0xe0 net/core/dst.c :173 Código: 4c 89 f2 89 d9 31 c0 5b 41 5e 5d e9 da d5 44 f9 e8 1d 90 5f f9 c6 05 87 48 c6 05 01 48 c7 c7 80 44 99 8b 31 c0 e8 e8 67 29 f9 &lt;0f&gt; 0b eb 85 0f 1f 40 00 53 48 89 fb e8 f7 8f 5f f9 48 83 c3 a8 48 RSP: 0018:ffffc9000aa5faa0 EFLAGS: 00010246 RAX: d6894a925dd15a00 RBX: RCX: 0000000000040000 RDX: ffffc90005e19000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: 0000000000000000 R08 : ffffffff816a1f42 R09: ffffed1017344f2c R10: ffffed1017344f2c R11: 0000000000000000 R12: 0000607f462b1358 R13: 1ffffffff1bfd305 R14: ffffe8ffffcb135 8 R15: dffffc0000000000 FS: 00007f66c71a2700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 50033 CR2: 00007f88aaed5058 CR3: 0000000023e0f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 00000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas: dst_cache_destroy+0x107/0x1e0 net/core/dst_cache.c:160 ipip6_dev_free net/ ipv6/sit.c:1414 [en línea] sit_init_net+0x229/0x550 net/ipv6/sit.c:1936 ops_init+0x313/0x430 net/core/net_namespace.c:140 setup_net+0x35b/0x9d0 net/core/net_namespace.c :326 copy_net_ns+0x359/0x5c0 net/core/net_namespace.c:470 create_new_namespaces+0x4ce/0xa00 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 ksys_unshare+0x57d/0xb50 .c :3075 __do_sys_unshare kernel/fork.c:3146 [en línea] __se_sys_unshare kernel/fork.c:3144 [en línea] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3144 do_syscall_x64 arch/x86/entry/common.c:50 [en línea ] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f66c882ce99 Código: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 &lt;48&gt; 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP:00 007f66c71a2168 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f66c893ff60 RCX: 00007f66c882ce99 RDX: 0000000000000000 RSI: 0000000000 000000 RDI: 0000000048040200 RBP: 00007f66c8886ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000000 00246 R12: 0000000000000000 R13: 00007fff6634832f R14: 00007f66c71a2300 R15: 0000000000022000

19 Jun 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-06-19 15:15

Updated : 2025-10-01 13:42

NVD link : CVE-2021-47588

Mitre link : CVE-2021-47588

CVE.ORG link : CVE-2021-47588

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo