high
7.8
CWE
787 416
Advisory Published
CVE Published
Updated

CVE-2023-3812: Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

First published: Wed Jul 19 2023(Updated: )

A flaw in the Linux Kernel found. If napi frags enabled and patch 363a5328f4b0 ("net: tun: fix bugs for oversize packet when napi frags enabled") not applied, then when local user try to send too large IPV6 packet (with big packet length), it can lead to out of bounds memory bug. Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363a5328f4b0">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363a5328f4b0</a>

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<6.1
6.1
Linux Kernel<=6.0.19
Linux Kernel=6.1-rc1
Linux Kernel=6.1-rc2
Linux Kernel=6.1-rc3
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=9.0
Linux Kernel>=4.15<4.19.265
Linux Kernel>=4.20<5.4.224
Linux Kernel>=5.5<5.10.154
Linux Kernel>=5.11<5.15.78
Linux Kernel>=5.16<6.0.8
IBM Security Verify Governance - Identity Manager<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager<=ISVG 10.0.2

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2224048

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=363a5328f4b0

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-3812?

    CVE-2023-3812 is an out-of-bounds memory access flaw found in the Linux kernel’s TUN/TAP device driver functionality.

  • How does CVE-2023-3812 impact a system?

    CVE-2023-3812 allows a local user to crash or potentially escalate their privileges on the system.

  • What is the severity of CVE-2023-3812?

    CVE-2023-3812 has a severity value of 7, indicating a high severity.

  • What software versions are affected by CVE-2023-3812?

    The Linux kernel versions up to and including 6.1, Linux Kernel versions 6.0.19, Linux Kernel version 6.1-rc1, Linux Kernel version 6.1-rc2, Linux Kernel version 6.1-rc3, Redhat Enterprise Linux version 8.0, and Redhat Enterprise Linux version 9.0 are affected by CVE-2023-3812.

  • How can CVE-2023-3812 be fixed?

    To fix CVE-2023-3812, users should update their Linux kernel to version 6.1 or apply the appropriate patches from the Linux kernel repository.

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