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ubuntucveUbuntu.comUB:CVE-2021-29154
HistoryApr 08, 2021 - 12:00 a.m.

CVE-2021-29154

2021-04-0800:00:00
ubuntu.com
ubuntu.com
32
cve-2021-29154
linux kernel
bpf jit
branch displacements
arbitrary code
kernel context
x86 architecture
security vulnerability

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0

Percentile

14.2%

JSON

BPF JIT compilers in the Linux kernel through 5.11.12 have incorrect
computation of branch displacements, allowing them to execute arbitrary
code within the kernel context. This affects arch/x86/net/bpf_jit_comp.c
and arch/x86/net/bpf_jit_comp32.c.

Notes

Author Note
sbeattie this issue is priority medium for trusty/3.13 kernels, as unprivileged BPF was not yet available in the Linux kernel of that era.
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-142.146UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-72.80UNKNOWN
ubuntu20.10noarchlinux< 5.8.0-50.56UNKNOWN
ubuntu14.04noarchlinux< anyUNKNOWN
ubuntu16.04noarchlinux< 4.4.0-209.241UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1099.106UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1045.47UNKNOWN
ubuntu20.10noarchlinux-aws< 5.8.0-1030.32UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1091.95UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1127.141UNKNOWN
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CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

EPSS

0

Percentile

14.2%

JSON
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