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CVE-2023-1872

Status Candidate

Overview

A use-after-free vulnerability in the Linux Kernel io_uring system can be exploited to achieve local privilege escalation. The io_file_get_fixed function lacks the presence of ctx->uring_lock which can lead to a Use-After-Free vulnerability due a race condition with fixed files getting unregistered. We recommend upgrading past commit da24142b1ef9fd5d36b76e36bab328a5b27523e8.

Related Files

Kernel Live Patch Security Notice LSN-0102-1
Posted Apr 9, 2024
Authored by Benjamin M. Romer

It was discovered that a race condition existed in the io_uring subsystem in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Lonial Con discovered that the netfilter subsystem in the Linux kernel contained a memory leak when handling certain element flush operations. A local attacker could use this to expose sensitive information (kernel memory). Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, memory leak
systems | linux
advisories | CVE-2023-1872, CVE-2023-4569, CVE-2023-51781, CVE-2023-6176, CVE-2024-0646, CVE-2024-1086
SHA-256 | 5d360530cd59a1d5483a776654fdfec33b0978f21c0af5d79f7f2f3fb4c9a39c
Kernel Live Patch Security Notice LSN-0095-1
Posted Jun 22, 2023
Authored by Benjamin M. Romer

It was discovered that the OverlayFS implementation in the Linux kernel did not properly handle copy up operation in some conditions. A local attacker could possibly use this to gain elevated privileges. It was discovered that the Broadcom FullMAC USB WiFi driver in the Linux kernel did not properly perform data buffer size validation in some situations. A physically proximate attacker could use this to craft a malicious USB device that when inserted, could cause a denial of service (system crash) or possibly expose sensitive information. It was discovered that a race condition existed in the io_uring subsystem in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2023-0386, CVE-2023-1380, CVE-2023-1872, CVE-2023-2612, CVE-2023-31436, CVE-2023-32233
SHA-256 | 9af3c677c764aab7902d47c2a505555b84fde68a690ae6e7624c01659fe90f86
Ubuntu Security Notice USN-6133-1
Posted Jun 2, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6133-1 - It was discovered that the Traffic-Control Index implementation in the Linux kernel did not properly perform filter deactivation in some situations. A local attacker could possibly use this to gain elevated privileges. Please note that with the fix for this CVE, kernel support for the TCINDEX classifier has been removed. It was discovered that some AMD x86-64 processors with SMT enabled could speculatively execute instructions using a return address from a sibling thread. A local attacker could possibly use this to expose sensitive information.

tags | advisory, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2022-27672, CVE-2022-3707, CVE-2023-0459, CVE-2023-1075, CVE-2023-1078, CVE-2023-1118, CVE-2023-1513, CVE-2023-1829, CVE-2023-1872, CVE-2023-20938, CVE-2023-2162, CVE-2023-32269
SHA-256 | 8dbd60b85d91d8541dce5a452bbd26cd2c78f4622dc2154acc6b4aac98331f41
Ubuntu Security Notice USN-6070-1
Posted May 11, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6070-1 - It was discovered that the Traffic-Control Index implementation in the Linux kernel did not properly perform filter deactivation in some situations. A local attacker could possibly use this to gain elevated privileges. Please note that with the fix for this CVE, kernel support for the TCINDEX classifier has been removed. It was discovered that a race condition existed in the io_uring subsystem in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-1829, CVE-2023-1872
SHA-256 | fa0504421830ed00c4f6bcbaae386c80766836060ce80dbaed62ec20449f15e7
Ubuntu Security Notice USN-6051-1
Posted May 1, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6051-1 - It was discovered that the Traffic-Control Index implementation in the Linux kernel did not properly perform filter deactivation in some situations. A local attacker could possibly use this to gain elevated privileges. Please note that with the fix for thisCVE, kernel support for the TCINDEX classifier has been removed. It was discovered that a race condition existed in the io_uring subsystem in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-1829, CVE-2023-1872
SHA-256 | 8f3d3ba695803e924025f809e81f937f6354a99d3974142526b46598df33475c
Ubuntu Security Notice USN-6044-1
Posted Apr 27, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6044-1 - It was discovered that the Traffic-Control Index implementation in the Linux kernel did not properly perform filter deactivation in some situations. A local attacker could possibly use this to gain elevated privileges. Please note that with the fix for this CVE, kernel support for the TCINDEX classifier has been removed. It was discovered that a race condition existed in the io_uring subsystem in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-1829, CVE-2023-1872
SHA-256 | 5b839e06eac533ee8f931c1c5769d4b8cd6ee8129c976f2954f2bcb6042ef741
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