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CVE-2024-26884

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix hashtab overflow check on 32-bit arches The hashtab code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. So apply the same fix to hashtab, by moving the overflow check to before the roundup.

Related Files

Ubuntu Security Notice USN-6938-1
Posted Aug 1, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6938-1 - It was discovered that the device input subsystem in the Linux kernel did not properly handle the case when an event code falls outside of a bitmap. A local attacker could use this to cause a denial of service. 黄思聪 discovered that the NFC Controller Interface implementation in the Linux kernel did not properly handle certain memory allocation failure conditions, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-46932, CVE-2021-46960, CVE-2022-48619, CVE-2023-46343, CVE-2023-52444, CVE-2023-52449, CVE-2023-52620, CVE-2024-24857, CVE-2024-25739, CVE-2024-26840, CVE-2024-26884, CVE-2024-26886, CVE-2024-26934, CVE-2024-27020
SHA-256 | 2b1fe74bf4e050be2f9b24272b13e4eb597cb8e2474c9e01998d2ad12881b722
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