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mageiaGentoo FoundationMGASA-2022-0278
HistoryAug 06, 2022 - 6:43 p.m.

Updated kernel packages fix security vulnerabilities

2022-08-0618:43:47
Gentoo Foundation
advisories.mageia.org
85
kernel update
security vulnerabilities
cve-2022-21505
cve-2022-23825
cve-2022-29900
retbleed
cve-2022-29901
cve-2022-36123
cve-2022-36879
cve-2022-36946
upstream fixes

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

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

0.009

Percentile

82.8%

This kernel update is based on upstream 5.15.58 and fixes at least the following security issues: Kernel lockdown bypass when UEFI secure boot is disabled / unavailable and IMA appraisal is enabled (CVE-2022-21505). Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially leading to information disclosure (CVE-2022-23825). Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchitecture-dependent conditions (CVE-2022-29900, RetBleed). Intel microprocessor generations 6 to 8 are affected by a new Spectre variant that is able to bypass their retpoline mitigation in the kernel to leak arbitrary data. An attacker with unprivileged user access can hijack return instructions to achieve arbitrary speculative code execution under certain microarchitecture-dependent conditions (CVE-2022-29901). The Linux kernel before 5.18.13 lacks a certain clear operation for the block starting symbol (.bss). This allows Xen PV guest OS users to cause a denial of service or gain privileges (CVE-2022-36123). An issue was discovered in the Linux kernel through 5.18.14. xfrm_expand_policies in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice (CVE-2022-36879). nfqnl_mangle in net/netfilter/nfnetlink_queue.c in the Linux kernel through 5.18.14 allows remote attackers to cause a denial of service (panic) because, in the case of an nf_queue verdict with a one-byte nfta_payload attribute, an skb_pull can encounter a negative skb->len (CVE-2022-36946). Other fixes in this update: - fs: sendfile handles O_NONBLOCK of out_fd - hugetlb: fix memoryleak in hugetlb_mcopy_atomic_pte - mm: fix page leak with multiple threads mapping the same page - x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available - x86/speculation: Make all RETbleed mitigations 64-bit only For other upstream fixes, see the referenced changelogs.

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

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

0.009

Percentile

82.8%