CVE-2022-49636 Vulnerability Analysis & Exploit Details

CVE-2022-49636
Vulnerability Scoring

5.5
/10
Significant Risk

Security assessments indicate that CVE-2022-49636 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2022-49636 Details

Status: Analyzed

Last updated: 🕥 11 Mar 2025, 22:30 UTC
Originally published on: 🕖 26 Feb 2025, 07:01 UTC

Time between publication and last update: 13 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVE-2022-49636 Vulnerability Summary

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

Assessing the Risk of CVE-2022-49636

Access Complexity Graph

The exploitability of CVE-2022-49636 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2022-49636

CVE-2022-49636 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2022-49636, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2022-49636, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2022-49636 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2022-49636 poses no threat to data integrity.
  • Availability: High
    CVE-2022-49636 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.043% (probability of exploit)

EPSS Percentile: 11.99% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 88.01% of others.

CVE-2022-49636 References

External References

CWE Common Weakness Enumeration

CWE-401

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:5.15.142:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.142:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.143:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.143:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.144:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.144:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.145:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.145:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.146:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.146:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.147:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.147:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.148:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.148:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.149:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.149:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.150:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.150:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.151:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.151:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.152:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.152:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.153:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.153:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.154:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.154:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.155:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.155:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.156:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.156:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.157:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.157:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.158:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.158:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.159:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.159:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.160:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.160:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.161:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.161:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.162:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.162:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.163:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.163:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.164:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.164:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.165:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.165:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.166:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.166:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.167:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.167:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.168:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.168:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.169:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.169:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.170:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.170:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.171:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.171:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.172:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.172:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.173:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.173:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.174:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.174:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.175:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.175:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.176:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.176:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.177:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.177:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15.178:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.15.178:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17.15:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17.15:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.17:rc8:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.17:rc8:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.18.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.18.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
    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:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.19:rc3:*:*:*:*:*:*
    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:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*

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