Mageia 2022-0279: kernel-linus security update | LinuxSecurity.com

Advisories

MGASA-2022-0279 - Updated kernel-linus packages fix security vulnerabilities

Publication date: 06 Aug 2022
URL: https://advisories.mageia.org/MGASA-2022-0279.html
Type: security
Affected Mageia releases: 8
CVE: CVE-2022-21505,
     CVE-2022-23825,
     CVE-2022-29900,
     CVE-2022-29901,
     CVE-2022-36123,
     CVE-2022-36879

This kernel-linus 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).

For other upstream fixes, see the referenced changelogs.

References:
- https://bugs.mageia.org/show_bug.cgi?id=30688
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.56
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.57
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.58
- https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1037
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00702.html
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-21505
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23825
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29900
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29901
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-36123
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-36879

SRPMS:
- 8/core/kernel-linus-5.15.58-1.mga8

Mageia 2022-0279: kernel-linus security update

This kernel-linus 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 ...

Summary

This kernel-linus 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).
For other upstream fixes, see the referenced changelogs.

References

- https://bugs.mageia.org/show_bug.cgi?id=30688

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.56

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.57

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.58

- https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1037

- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00702.html

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-21505

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23825

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29900

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-29901

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-36123

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-36879

Resolution

MGASA-2022-0279 - Updated kernel-linus packages fix security vulnerabilities

SRPMS

- 8/core/kernel-linus-5.15.58-1.mga8

Severity
Publication date: 06 Aug 2022
URL: https://advisories.mageia.org/MGASA-2022-0279.html
Type: security
CVE: CVE-2022-21505, CVE-2022-23825, CVE-2022-29900, CVE-2022-29901, CVE-2022-36123, CVE-2022-36879

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