Use of Uninitialized Variable in Linux kernel - CVE-2026-72433

Vulnerability identifier: #VU143001

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72433

CWE-ID: CWE-457

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to disclose sensitive information.

The vulnerability exists due to uninitialized memory exposure in nft_meta_bridge_get_eval in nft_meta_bridge.c when evaluating the NFT_META_BRI_IIFPVID metadata expression. A local attacker can trigger processing of a bridge interface PVID query that encounters an error condition to disclose sensitive information.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/27dd2997746d54ebc079bb13161cc1bdd401d4a6
• https://git.kernel.org/stable/c/4dce8bf588a89bef99b446136d15685a837e7acf
• https://git.kernel.org/stable/c/7e23965d44f06ed93fb5362fb1e321b769eecc3b
• https://git.kernel.org/stable/c/92c9682b36f0c8f7a1f14d4558b72793f62e90a1
• https://git.kernel.org/stable/c/a853c3769b73ceb2d2b735aff621d1d51fe0553d
• https://git.kernel.org/stable/c/b1b0b9efe641afa5c2d4ba2ec77aed7b6f4bc398
• https://git.kernel.org/stable/c/c37a39b963034cc2d141baf46017614cb1fc275f
• https://git.kernel.org/stable/c/f73b7de5338fcca7f63ca88597a050c119501531

• Use of Uninitialized Variable in Linux kernel bridge netfilter
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0