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CVE-2023-3776

Status Candidate

Overview

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.

Related Files

Ubuntu Security Notice USN-6318-1
Posted Aug 30, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6318-1 - Daniel Moghimi discovered that some Intel Processors did not properly clear microarchitectural state after speculative execution of various instructions. A local unprivileged user could use this to obtain to sensitive information. Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain vector register instructions. A local attacker could use this to expose sensitive information.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2022-40982, CVE-2023-20593, CVE-2023-3609, CVE-2023-3610, CVE-2023-3611, CVE-2023-3776, CVE-2023-3777, CVE-2023-3995, CVE-2023-4004, CVE-2023-4015
SHA-256 | 1b7bbe8779efdf714318dc0d4a82b27e5611d839a9924800d8d0dbcd7ea7ca73
Ubuntu Security Notice USN-6315-1
Posted Aug 30, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6315-1 - Daniel Moghimi discovered that some Intel Processors did not properly clear microarchitectural state after speculative execution of various instructions. A local unprivileged user could use this to obtain to sensitive information. Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain vector register instructions. A local attacker could use this to expose sensitive information.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2022-40982, CVE-2023-20593, CVE-2023-21400, CVE-2023-3609, CVE-2023-3610, CVE-2023-3611, CVE-2023-3776, CVE-2023-3777, CVE-2023-3995, CVE-2023-4004, CVE-2023-4015
SHA-256 | 873c4cefd57f45a1c8bc078ea3edde1dcdd2a6df91f90b68d4e4fd025a0371b4
Ubuntu Security Notice USN-6309-1
Posted Aug 29, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6309-1 - Zheng Zhang discovered that the device-mapper implementation in the Linux kernel did not properly handle locking during table_clear operations. A local attacker could use this to cause a denial of service. It was discovered that a use-after-free vulnerability existed in the HFS+ file system implementation in the Linux kernel. A local attacker could possibly use this to cause a denial of service.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2023-2269, CVE-2023-2985, CVE-2023-31084, CVE-2023-3567, CVE-2023-3611, CVE-2023-3776
SHA-256 | babc60df14f656c3c6f1d4b53c94991c7b510466619a66a6c569c61fa120f99f
Ubuntu Security Notice USN-6285-1
Posted Aug 14, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6285-1 - It was discovered that the NTFS file system implementation in the Linux kernel did not properly check buffer indexes in certain situations, leading to an out-of-bounds read vulnerability. A local attacker could possibly use this to expose sensitive information. Stonejiajia, Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in the Ubuntu Linux kernel did not properly perform permission checks in certain situations. A local attacker could possibly use this to gain elevated privileges.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2022-48502, CVE-2023-2640, CVE-2023-2898, CVE-2023-31248, CVE-2023-32629, CVE-2023-3390, CVE-2023-35001, CVE-2023-3609, CVE-2023-3610, CVE-2023-3611, CVE-2023-3776, CVE-2023-38430, CVE-2023-38432, CVE-2023-3863
SHA-256 | c7303f43ba77d16cc931ee8b1c0d2f16d00a561cedb386fa837bfed417cd59f3
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