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CVE-2023-52497

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: erofs: fix lz4 inplace decompression Currently EROFS can map another compressed buffer for inplace decompression, that was used to handle the cases that some pages of compressed data are actually not in-place I/O. However, like most simple LZ77 algorithms, LZ4 expects the compressed data is arranged at the end of the decompressed buffer and it explicitly uses memmove() to handle overlapping: __________________________________________________________ |_ direction of decompression --> ____ |_ compressed data _| Although EROFS arranges compressed data like this, it typically maps two individual virtual buffers so the relative order is uncertain. Previously, it was hardly observed since LZ4 only uses memmove() for short overlapped literals and x86/arm64 memmove implementations seem to completely cover it up and they don't have this issue. Juhyung reported that EROFS data corruption can be found on a new Intel x86 processor. After some analysis, it seems that recent x86 processors with the new FSRM feature expose this issue with "rep movsb". Let's strictly use the decompressed buffer for lz4 inplace decompression for now. Later, as an useful improvement, we could try to tie up these two buffers together in the correct order.

Related Files

Ubuntu Security Notice USN-6892-1
Posted Jul 11, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6892-1 - It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the Atheros 802.11ac wireless driver did not properly validate certain data structures, leading to a NULL pointer dereference. An attacker could possibly use this to cause a denial of service.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2023-52434, CVE-2023-52497, CVE-2023-52620, CVE-2023-52640, CVE-2023-52641, CVE-2023-52644, CVE-2023-52645, CVE-2023-52650, CVE-2023-52662, CVE-2023-6270, CVE-2023-7042, CVE-2024-0841, CVE-2024-21823, CVE-2024-22099
SHA-256 | 1be86e553b162ce9d9fd8fc31873fb51eaca06565f561d7ea634d412de51ed92
Ubuntu Security Notice USN-6828-1
Posted Jun 12, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6828-1 - Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2022-0001, CVE-2023-47233, CVE-2023-52486, CVE-2023-52491, CVE-2023-52492, CVE-2023-52493, CVE-2023-52497, CVE-2023-52530, CVE-2023-52583, CVE-2023-52588, CVE-2023-52594, CVE-2023-52598, CVE-2023-52599, CVE-2023-52601
SHA-256 | 488517b61336dab3bc51a5c78cc3f59815f9cbaf86589ad479bd44ac1cb98921
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