high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2023-0461: Use-after-free vulnerability in the Linux Kernel

First published: Thu Feb 23 2023(Updated: )

A use-after-free flaw was found in the Linux kernel’s TLS protocol functionality in how a user installs a tls context (struct tls_context) on a connected TCP socket. This flaw allows a local user to crash or potentially escalate their privileges on the system.

Credit: cve-coordination@google.com cve-coordination@google.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-477.10.1.rt7.274.el8_8
0:4.18.0-477.10.1.rt7.274.el8_8
redhat/kernel<0:4.18.0-477.10.1.el8_8
0:4.18.0-477.10.1.el8_8
redhat/kernel<0:4.18.0-147.83.1.el8_1
0:4.18.0-147.83.1.el8_1
redhat/kernel<0:4.18.0-193.109.1.el8_2
0:4.18.0-193.109.1.el8_2
redhat/kernel-rt<0:4.18.0-193.109.1.rt13.160.el8_2
0:4.18.0-193.109.1.rt13.160.el8_2
redhat/kernel-rt<0:4.18.0-305.86.2.rt7.160.el8_4
0:4.18.0-305.86.2.rt7.160.el8_4
redhat/kernel<0:4.18.0-305.86.2.el8_4
0:4.18.0-305.86.2.el8_4
redhat/kernel<0:4.18.0-372.52.1.el8_6
0:4.18.0-372.52.1.el8_6
redhat/kernel<0:5.14.0-284.11.1.el9_2
0:5.14.0-284.11.1.el9_2
redhat/kernel-rt<0:5.14.0-284.11.1.rt14.296.el9_2
0:5.14.0-284.11.1.rt14.296.el9_2
redhat/kernel<0:5.14.0-70.58.1.el9_0
0:5.14.0-70.58.1.el9_0
redhat/kernel-rt<0:5.14.0-70.58.1.rt21.129.el9_0
0:5.14.0-70.58.1.rt21.129.el9_0
redhat/kernel<6.2
6.2
Linux Kernel>=4.13.0<4.14.303
Linux Kernel>=4.19<4.19.270
Linux Kernel>=5.4<5.4.229
Linux Kernel>=5.10<5.10.163
Linux Kernel>=5.15<5.15.88
Linux Kernel>=6.0<6.0.19
Linux Kernel>=6.1<6.1.5
Linux Kernel=6.2-rc1
Linux Kernel=6.2-rc2
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.119-1
6.12.10-1
6.12.11-1

Remedy

To mitigate this issue, prevent module tls from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2c02d41d71f90a5168391b6a5f2954112ba2307c

Remedy

https://kernel.dance/#2c02d41d71f90a5168391b6a5f2954112ba2307c

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-0461?

    CVE-2023-0461 is classified as a high-severity vulnerability due to its potential for privilege escalation.

  • How do I fix CVE-2023-0461?

    To fix CVE-2023-0461, update your Linux kernel to version 4.18.0-477.10.1.rt7.274.el8_8 or later.

  • Which Linux kernel versions are affected by CVE-2023-0461?

    CVE-2023-0461 affects Linux kernel versions prior to 4.18.0-477.10.1.rt7.274.el8_8.

  • Can CVE-2023-0461 be exploited remotely?

    CVE-2023-0461 primarily allows local users to exploit the vulnerability, rather than being remotely exploitable.

  • What impact does CVE-2023-0461 have on system integrity?

    CVE-2023-0461 can cause system crashes and potentially allow local users to escalate their privileges on the system.

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