Summary
It was discovered that the Traffic-Control Index (TCINDEX) 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. (CVE-2023-1829)
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. (CVE-2023-1872)
Fixed packages 13
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 20.04 LTS 20.04:LTS | linux-aws-5.15 | 5.15.0-1035.39~20.04.1 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-gke-5.15 | 5.15.0-1032.37~20.04.1 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-hwe-5.15 | 5.15.0-71.78~20.04.1 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-lowlatency-hwe-5.15 | 5.15.0-71.78~20.04.1 |
| Ubuntu · 20.04 LTS 20.04:LTS | linux-oracle-5.15 | 5.15.0-1034.40~20.04.1 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux | 5.15.0-71.78 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux-aws | 5.15.0-1035.39 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux-azure | 5.15.0-1037.44 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux-gke | 5.15.0-1032.37 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux-gkeop | 5.15.0-1019.24 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux-ibm | 5.15.0-1029.32 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux-lowlatency | 5.15.0-71.78 |
| Ubuntu · 22.04 LTS 22.04:LTS | linux-oracle | 5.15.0-1034.40 |
Vulnerabilities 2
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High 7.8CVE-2023-1829 Public exploit
Use-after-free in tcindex (traffic control index filter) in the Linux Kernel
A use-after-free vulnerability in the Linux Kernel traffic control index filter (tcindex) can be exploited to achieve local privilege escalation. The tcindex_delete function which does not properly deactivate filters in case of a perfect hashes while deleting…
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High 7.8
Use-after-free in Linux kernel's io_uring subsystem
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 conditi…