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CVE-2024-26885 Detail


In the Linux kernel, the following vulnerability has been resolved: bpf: Fix DEVMAP_HASH overflow check on 32-bit arches The devmap code allocates a number hash buckets equal to the next power of two of the max_entries value provided when creating the map. When rounding up to the next power of two, the 32-bit variable storing the number of buckets can overflow, and the code checks for overflow by checking if the truncated 32-bit value is equal to 0. However, on 32-bit arches the rounding up itself can overflow mid-way through, because it ends up doing a left-shift of 32 bits on an unsigned long value. If the size of an unsigned long is four bytes, this is undefined behaviour, so there is no guarantee that we'll end up with a nice and tidy 0-value at the end. Syzbot managed to turn this into a crash on arm32 by creating a DEVMAP_HASH with max_entries > 0x80000000 and then trying to update it. Fix this by moving the overflow check to before the rounding up operation.


CVSS 4.0 Severity and Metrics:

NVD assessment not yet provided.

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c Patch 
https://git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fb Patch 
https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691 Patch 
https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3 Patch 
https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3 Patch 
https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c Patch 
https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

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