- Description
- In the Linux kernel, the following vulnerability has been resolved: vlan: enforce underlying device type Currently, VLAN devices can be created on top of non-ethernet devices. Besides the fact that it doesn't make much sense, this also causes a bug which leaks the address of a kernel function to usermode. When creating a VLAN device, we initialize GARP (garp_init_applicant) and MRP (mrp_init_applicant) for the underlying device. As part of the initialization process, we add the multicast address of each applicant to the underlying device, by calling dev_mc_add. __dev_mc_add uses dev->addr_len to determine the length of the new multicast address. This causes an out-of-bounds read if dev->addr_len is greater than 6, since the multicast addresses provided by GARP and MRP are only 6 bytes long. This behaviour can be reproduced using the following commands: ip tunnel add gretest mode ip6gre local ::1 remote ::2 dev lo ip l set up dev gretest ip link add link gretest name vlantest type vlan id 100 Then, the following command will display the address of garp_pdu_rcv: ip maddr show | grep 01:80:c2:00:00:21 Fix the bug by enforcing the type of the underlying device during VLAN device initialization.
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- NVD status
- Analyzed
CVSS 3.1
- Type
- Primary
- Base score
- 7.1
- Impact score
- 5.2
- Exploitability score
- 1.8
- Vector string
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Severity
- HIGH
- nvd@nist.gov
- CWE-125
- Hype score
- Not currently trending
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8682564C-6952-49AA-9FA9-9DBF2123C993",
"versionEndExcluding": "5.4.291",
"versionStartIncluding": "2.6.35"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "545121FA-DE31-4154-9446-C2000FB4104D",
"versionEndExcluding": "5.10.235",
"versionStartIncluding": "5.5"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C708062C-4E1B-465F-AE6D-C09C46400875",
"versionEndExcluding": "5.15.179",
"versionStartIncluding": "5.11"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "BA9C2DE3-D37C-46C6-8DCD-2EE509456E0B",
"versionEndExcluding": "6.1.131",
"versionStartIncluding": "5.16"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7D9F642F-6E05-4926-B0FE-62F95B7266BC",
"versionEndExcluding": "6.6.83",
"versionStartIncluding": "6.2"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "32865E5C-8AE1-4D3D-A64D-299039694A88",
"versionEndExcluding": "6.12.19",
"versionStartIncluding": "6.7"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "842F5A44-3E71-4546-B4FD-43B0ACE3F32B",
"versionEndExcluding": "6.13.7",
"versionStartIncluding": "6.13"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "66619FB8-0AAF-4166-B2CF-67B24143261D"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D3D6550E-6679-4560-902D-AF52DCFE905B"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "45B90F6B-BEC7-4D4E-883A-9DBADE021750"
}
],
"operator": "OR"
}
]
}
]