CVE-2024-26789: crypto: arm64/neonbs - fix out-of-bounds access on short input
First published: Thu Apr 04 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: crypto: arm64/neonbs - fix out-of-bounds access on short input The bit-sliced implementation of AES-CTR operates on blocks of 128 bytes, and will fall back to the plain NEON version for tail blocks or inputs that are shorter than 128 bytes to begin with. It will call straight into the plain NEON asm helper, which performs all memory accesses in granules of 16 bytes (the size of a NEON register). For this reason, the associated plain NEON glue code will copy inputs shorter than 16 bytes into a temporary buffer, given that this is a rare occurrence and it is not worth the effort to work around this in the asm code. The fallback from the bit-sliced NEON version fails to take this into account, potentially resulting in out-of-bounds accesses. So clone the same workaround, and use a temp buffer for short in/outputs.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.18<=6.1.81 | |
| Linux Kernel | >=6.2<=6.6.21 | |
| Linux Kernel | >=6.2<=6.7.9 | |
| Linux Kernel | =6.8-rc1 | |
| Linux Kernel | =6.8-rc2 | |
| Linux Kernel | =6.8-rc3 | |
| Linux Kernel | =6.8-rc4 | |
| Linux Kernel | =6.8-rc5 | |
| Linux Kernel | =6.8-rc6 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/034e2d70b5c7f578200ad09955aeb2aa65d1164a
- https://git.kernel.org/stable/c/1291d278b5574819a7266568ce4c28bce9438705
- https://git.kernel.org/stable/c/1c0cf6d19690141002889d72622b90fc01562ce4
- https://git.kernel.org/stable/c/9e8ecd4908b53941ab6f0f51584ab80c6c6606c4
- https://launchpad.net/bugs/cve/CVE-2024-26789
- https://git.kernel.org/linus/1c0cf6d19690141002889d72622b90fc01562ce4
- https://security-tracker.debian.org/tracker/CVE-2024-26789
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26789
- https://nvd.nist.gov/vuln/detail/CVE-2024-26789
- https://ubuntu.com/security/CVE-2024-26789
Frequently Asked Questions
What is the severity of CVE-2024-26789?
CVE-2024-26789 has been classified as a high-severity vulnerability due to the potential for out-of-bounds access.
How do I fix CVE-2024-26789?
To fix CVE-2024-26789, upgrade to Linux kernel versions 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, 6.12.10-1, or 6.12.11-1.
What systems are affected by CVE-2024-26789?
CVE-2024-26789 affects systems running specific versions of the Linux kernel that utilize the NEON implementation for AES-CTR.
Is CVE-2024-26789 exploitable remotely?
CVE-2024-26789 is not typically considered remotely exploitable but may affect local users through specially crafted inputs.
What are the consequences of not addressing CVE-2024-26789?
Ignoring CVE-2024-26789 may lead to potential security risks, including unauthorized access to system memory.
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