CVE-2022-49636

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49636
In the Linux kernel, the following vulnerability has been resolved: vlan: fix memory leak in vlan_newlink() Blamed commit added back a bug I fixed in commit 9bbd917e0bec ("vlan: fix memory leak in vlan_dev_set_egress_priority") If a memory allocation fails in vlan_changelink() after other allocations succeeded, we need to call vlan_dev_free_egress_priority() to free all allocated memory because after a failed ->newlink() we do not call any methods like ndo_uninit() or dev->priv_destructor(). In following example, if the allocation for last element 2000:2001 fails, we need to free eight prior allocations: ip link add link dummy0 dummy0.100 type vlan id 100 \ egress-qos-map 1:2 2:3 3:4 4:5 5:6 6:7 7:8 8:9 2000:2001 syzbot report was: BUG: memory leak unreferenced object 0xffff888117bd1060 (size 32): comm "syz-executor408", pid 3759, jiffies 4294956555 (age 34.090s) hex dump (first 32 bytes): 09 00 00 00 00 a0 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff83fc60ad>] kmalloc include/linux/slab.h:600 [inline] [<ffffffff83fc60ad>] vlan_dev_set_egress_priority+0xed/0x170 net/8021q/vlan_dev.c:193 [<ffffffff83fc6628>] vlan_changelink+0x178/0x1d0 net/8021q/vlan_netlink.c:128 [<ffffffff83fc67c8>] vlan_newlink+0x148/0x260 net/8021q/vlan_netlink.c:185 [<ffffffff838b1278>] rtnl_newlink_create net/core/rtnetlink.c:3363 [inline] [<ffffffff838b1278>] __rtnl_newlink+0xa58/0xdc0 net/core/rtnetlink.c:3580 [<ffffffff838b1629>] rtnl_newlink+0x49/0x70 net/core/rtnetlink.c:3593 [<ffffffff838ac66c>] rtnetlink_rcv_msg+0x21c/0x5c0 net/core/rtnetlink.c:6089 [<ffffffff839f9c37>] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2501 [<ffffffff839f8da7>] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] [<ffffffff839f8da7>] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345 [<ffffffff839f9266>] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921 [<ffffffff8384dbf6>] sock_sendmsg_nosec net/socket.c:714 [inline] [<ffffffff8384dbf6>] sock_sendmsg+0x56/0x80 net/socket.c:734 [<ffffffff8384e15c>] ____sys_sendmsg+0x36c/0x390 net/socket.c:2488 [<ffffffff838523cb>] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2542 [<ffffffff838525b8>] __sys_sendmsg net/socket.c:2571 [inline] [<ffffffff838525b8>] __do_sys_sendmsg net/socket.c:2580 [inline] [<ffffffff838525b8>] __se_sys_sendmsg net/socket.c:2578 [inline] [<ffffffff838525b8>] __x64_sys_sendmsg+0x78/0xf0 net/socket.c:2578 [<ffffffff845ad8d5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff845ad8d5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff8460006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

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/4c43069bb1097dd6cc1cf0f7c43a36d1f7b3910b Patch
https://git.kernel.org/stable/c/549de58dba4bf1b2adc72e9948b9c76fa88be9d2
https://git.kernel.org/stable/c/72a0b329114b1caa8e69dfa7cdad1dd3c69b8602 Patch
https://git.kernel.org/stable/c/df27729a4fe0002dfd80c96fe1c142829c672728
https://git.kernel.org/stable/c/f5dc10b910bdac523e5947336445a77066c51bf9
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:5.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*
History

10 Apr 2025, 13:15

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/549de58dba4bf1b2adc72e9948b9c76fa88be9d2 -
  • () https://git.kernel.org/stable/c/df27729a4fe0002dfd80c96fe1c142829c672728 -
  • () https://git.kernel.org/stable/c/f5dc10b910bdac523e5947336445a77066c51bf9 -

11 Mar 2025, 22:30

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-401
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vlan: arregla la pérdida de memoria en vlan_newlink() El commit culpable agregó un error que arreglé en el commit 9bbd917e0bec ("vlan: arregla la pérdida de memoria en vlan_dev_set_egress_priority") Si una asignación de memoria falla en vlan_changelink() después de que otras asignaciones tuvieron éxito, debemos llamar a vlan_dev_free_egress_priority() para liberar toda la memoria asignada porque después de un -&gt;newlink() fallido no llamamos a ningún método como ndo_uninit() o dev-&gt;priv_destructor(). En el siguiente ejemplo, si falla la asignación del último elemento 2000:2001, necesitamos liberar ocho asignaciones anteriores: ip link add link dummy0 dummy0.100 type vlan id 100 \ egress-qos-map 1:2 2:3 3:4 4:5 5:6 6:7 7:8 8:9 2000:2001 el informe de syzbot fue: ERROR: pérdida de memoria objeto no referenciado 0xffff888117bd1060 (size 32): comm "syz-executor408", pid 3759, jiffies 4294956555 (age 34.090s) hex dump (first 32 bytes): 09 00 00 00 00 a0 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] kmalloc include/linux/slab.h:600 [inline] [] vlan_dev_set_egress_priority+0xed/0x170 net/8021q/vlan_dev.c:193 [] vlan_changelink+0x178/0x1d0 net/8021q/vlan_netlink.c:128 [] vlan_newlink+0x148/0x260 net/8021q/vlan_netlink.c:185 [] rtnl_newlink_create net/core/rtnetlink.c:3363 [inline] [] __rtnl_newlink+0xa58/0xdc0 net/core/rtnetlink.c:3580 [] rtnl_newlink+0x49/0x70 net/core/rtnetlink.c:3593 [] rtnetlink_rcv_msg+0x21c/0x5c0 net/core/rtnetlink.c:6089 [] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2501 [] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] [] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345 [] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921 [] sock_sendmsg_nosec net/socket.c:714 [inline] [] sock_sendmsg+0x56/0x80 net/socket.c:734 [] ____sys_sendmsg+0x36c/0x390 net/socket.c:2488 [] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2542 [] __sys_sendmsg net/socket.c:2571 [inline] [] __do_sys_sendmsg net/socket.c:2580 [inline] [] __se_sys_sendmsg net/socket.c:2578 [inline] [] __x64_sys_sendmsg+0x78/0xf0 net/socket.c:2578 [] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [] entry_SYSCALL_64_after_hwframe+0x46/0xb0
References () https://git.kernel.org/stable/c/4c43069bb1097dd6cc1cf0f7c43a36d1f7b3910b - () https://git.kernel.org/stable/c/4c43069bb1097dd6cc1cf0f7c43a36d1f7b3910b - Patch
References () https://git.kernel.org/stable/c/72a0b329114b1caa8e69dfa7cdad1dd3c69b8602 - () https://git.kernel.org/stable/c/72a0b329114b1caa8e69dfa7cdad1dd3c69b8602 - Patch

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-04-10 13:15

NVD link : CVE-2022-49636

Mitre link : CVE-2022-49636

CVE.ORG link : CVE-2022-49636

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime