CVE-2021-33624

In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.

CVSS v3.0 4.7 MEDIUM
CVSS v2.0 4.7 MEDIUM

4.7^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

4.7^/10

CVSS v2.0 : MEDIUM

Vector : AV:L/AC:M/Au:N/C:C/I:N/A:N

Exploitability : 3.4 / Impact : 6.9

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact NONE

Availability Impact NONE

References

Link	Resource
https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner	Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/06/21/1	Mailing List Exploit Third Party Advisory
https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db	Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html	Issue Tracking Third Party Advisory

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Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Information

Published : 2021-06-23 09:15

Updated : 2021-11-12 12:15

NVD link : CVE-2021-33624

Mitre link : CVE-2021-33624

JSON object : View

CWE

CWE-203

Observable Discrepancy

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Products Affected

debian

debian_linux

linux

linux_kernel

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