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CVE-2021-35477

Published: 2 August 2021

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because a certain preempting store operation does not necessarily occur before a store operation that has an attacker-controlled value.

From the Ubuntu security team

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly protect against Speculative Store Bypass (SSB) side-channel attacks in some situations. A local attacker could possibly use this to expose sensitive information.

Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
linux-hwe
Launchpad, Ubuntu, Debian
bionic Ignored
(replaced by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(was needed ESM criteria)
impish Does not exist

jammy Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

bionic
Released (5.4.0-90.101~18.04.1)
jammy Does not exist

linux-hwe-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal Ignored
(was needed now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(superseded by linux-hwe)
impish Does not exist

jammy Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Ignored
(was needed ESM criteria)
xenial Does not exist

impish Does not exist

jammy Does not exist

linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-aws-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic
Released (5.4.0-1059.62~18.04.1)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-aws-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
focal Ignored
(was needed now end-of-life)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(was needed ESM criteria)
impish Does not exist

jammy Does not exist

linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
hirsute
Released (5.11.0-1017.18)
upstream
Released (5.14~rc4)
trusty Ignored
(was needed ESM criteria)
xenial Ignored
(was needed ESM criteria)
impish Not vulnerable
(5.13.0-1004.5)
focal
Released (5.4.0-1063.66)
jammy Not vulnerable
(5.13.0-1006.7)
linux-azure-4.15
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Needed

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

bionic
Released (5.4.0-1063.66~18.04.1)
jammy Does not exist

linux-azure-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal Ignored
(was needed now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Needed

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
hirsute
Released (5.11.0-1020.22)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(was needed ESM criteria)
impish Not vulnerable
(5.13.0-1003.4)
focal
Released (5.4.0-1057.61)
jammy Not vulnerable
(5.13.0-1005.6)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Needed

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

bionic
Released (5.4.0-1057.61~18.04.1)
jammy Does not exist

linux-gcp-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal Ignored
(was needed now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-gcp-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal
Released (5.4.0-1055.58)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(reached end of standard support)
impish Does not exist

jammy Not vulnerable
(5.15.0-1002.2)
linux-gke-4.15
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic
Released (5.4.0-1055.58~18.04.1)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-gkeop
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

focal
Released (5.4.0-1026.27)
jammy Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic
Released (5.4.0-1026.27~18.04.1)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.3)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-oracle-5.4)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

bionic
Released (5.4.0-1057.61~18.04.1)
jammy Does not exist

linux-oracle-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal Ignored
(was needed now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-oem
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(superseded by linux-hwe)
impish Does not exist

jammy Does not exist

linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-oem-5.10
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

focal
Released (5.10.0-1050.52)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
focal Does not exist

hirsute Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-raspi
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.4.0-1046.50)
hirsute
Released (5.11.0-1019.20)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Not vulnerable
(5.13.0-1007.8)
jammy Not vulnerable
(5.13.0-1008.9)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic Needed

focal Ignored
(replaced by linux-raspi)
hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(was needs-triage now end-of-life)
impish Does not exist

jammy Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1046.50~18.04.1)
focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-riscv
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Ignored
(was needs-triage now end-of-life)
hirsute
Released (5.11.0-1020.21)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Not vulnerable
(5.13.0-1003.3)
jammy Not vulnerable
(5.13.0-1004.4)
linux-riscv-5.8
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Ignored
(was needed now end-of-life)
hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Needed

focal Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(was needs-triage now end-of-life)
impish Does not exist

jammy Does not exist

linux
Launchpad, Ubuntu, Debian
bionic Needed

focal
Released (5.4.0-90.101)
upstream
Released (5.14~rc4)
trusty Ignored
(was needed ESM criteria)
xenial Ignored
(was needed ESM criteria)
impish Not vulnerable
(5.13.0-16.16)
hirsute
Released (5.11.0-37.41)
jammy Not vulnerable
(5.13.0-19.19)
linux-aws
Launchpad, Ubuntu, Debian
bionic Needed

focal
Released (5.4.0-1059.62)
hirsute
Released (5.11.0-1019.20)
upstream
Released (5.14~rc4)
trusty Ignored
(was needed ESM criteria)
xenial Ignored
(was needed ESM criteria)
impish Not vulnerable
(5.13.0-1005.6)
jammy Not vulnerable
(5.13.0-1005.6)
linux-kvm
Launchpad, Ubuntu, Debian
bionic Needed

hirsute
Released (5.11.0-1017.18)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(was needed ESM criteria)
impish Not vulnerable
(5.13.0-1002.2)
focal
Released (5.4.0-1049.51)
jammy Not vulnerable
(5.13.0-1004.4)
linux-oracle
Launchpad, Ubuntu, Debian
bionic Needed

hirsute
Released (5.11.0-1019.20)
upstream
Released (5.14~rc4)
trusty Does not exist

xenial Ignored
(was needed ESM criteria)
impish Not vulnerable
(5.13.0-1008.10)
focal
Released (5.4.0-1057.61)
jammy Not vulnerable
(5.13.0-1008.10)
linux-bluefield
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.4.0-1021.24)
hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-hwe-5.11
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.11.0-37.41~20.04.2)
hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-riscv-5.11
Launchpad, Ubuntu, Debian
bionic Does not exist

focal
Released (5.11.0-1020.21~20.04.1)
hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

jammy Does not exist

linux-oem-5.13
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

upstream
Released (5.14~rc4)
trusty Does not exist

xenial Does not exist

impish Does not exist

focal
Released (5.13.0-1014.18)
jammy Does not exist

linux-aws-5.11
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

upstream
Released (5.14~rc4)
focal
Released (5.11.0-1019.20~20.04.1)
jammy Does not exist

linux-azure-5.11
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

upstream
Released (5.14~rc4)
focal
Released (5.11.0-1017.18~20.04.1)
jammy Does not exist

linux-oracle-5.11
Launchpad, Ubuntu, Debian
bionic Does not exist

hirsute Does not exist

trusty Does not exist

xenial Does not exist

impish Does not exist

focal
Released (5.11.0-1019.20~20.04.1)
upstream
Released (5.14~rc4)
jammy Does not exist

linux-ibm
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

impish Does not exist

bionic Does not exist

focal
Released (5.4.0-1007.8)
hirsute Does not exist

upstream
Released (5.14~rc4)
jammy Not vulnerable
(5.15.0-1002.2)
linux-gcp-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.14~rc4)
focal
Released (5.11.0-1020.22~20.04.1)
jammy Does not exist

linux-oem-5.14
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Not vulnerable
(5.14.0-1004.4)
upstream
Released (5.14~rc4)
jammy Does not exist

linux-intel-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Not vulnerable

hirsute Does not exist

impish Does not exist

upstream
Released (5.14~rc4)
jammy Does not exist

linux-azure-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1009.10~20.04.2)
upstream
Released (5.14~rc4)
jammy Does not exist

linux-hwe-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Not vulnerable
(5.13.0-21.21~20.04.1)
impish Does not exist

upstream
Released (5.14~rc4)
jammy Does not exist

linux-aws-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Not vulnerable
(5.13.0-1008.9~20.04.2)
impish Does not exist

upstream
Released (5.14~rc4)
jammy Does not exist

linux-fips
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.14~rc4)
xenial Ignored
(was needed ESM criteria)
jammy Does not exist

linux-oracle-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1011.13~20.04.2)
upstream
Released (5.14~rc4)
jammy Does not exist

linux-gcp-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Not vulnerable
(5.13.0-1008.9~20.04.3)
upstream
Released (5.14~rc4)
jammy Does not exist

linux-ibm-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

impish Does not exist

bionic Not vulnerable
(5.4.0-1010.11~18.04.2)
upstream
Released (5.14~rc4)
jammy Does not exist

linux-azure-fde
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal Needed

upstream
Released (5.14~rc4)
jammy Does not exist

linux-lowlatency
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage

linux-oem-5.17
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage