CVE-2023-53441

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

bpf: cpumap: Fix memory leak in cpu_map_update_elem

Syzkaller reported a memory leak as follows:

BUG: memory leak

unreferenced object 0xff110001198ef748 (size 192):

comm "syz-executor.3", pid 17672, jiffies 4298118891 (age 9.906s)

hex dump (first 32 bytes):

00 00 00 00 4a 19 00 00 80 ad e3 e4 fe ff c0 00 ....J...........

00 b2 d3 0c 01 00 11 ff 28 f5 8e 19 01 00 11 ff ........(.......

backtrace:

[<ffffffffadd28087>] __cpu_map_entry_alloc+0xf7/0xb00

[<ffffffffadd28d8e>] cpu_map_update_elem+0x2fe/0x3d0

[<ffffffffadc6d0fd>] bpf_map_update_value.isra.0+0x2bd/0x520

[<ffffffffadc7349b>] map_update_elem+0x4cb/0x720

[<ffffffffadc7d983>] __se_sys_bpf+0x8c3/0xb90

[<ffffffffb029cc80>] do_syscall_64+0x30/0x40

[<ffffffffb0400099>] entry_SYSCALL_64_after_hwframe+0x61/0xc6

BUG: memory leak

unreferenced object 0xff110001198ef528 (size 192):

comm "syz-executor.3", pid 17672, jiffies 429

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References