CVE-2024-50126

/// Technical description

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

net: sched: use RCU read-side critical section in taprio_dump()

Fix possible use-after-free in 'taprio_dump()' by adding RCU

read-side critical section there. Never seen on x86 but

found on a KASAN-enabled arm64 system when investigating

https://syzkaller.appspot.com/bug?extid=b65e0af58423fc8a73aa:

[T15862] BUG: KASAN: slab-use-after-free in taprio_dump+0xa0c/0xbb0

[T15862] Read of size 4 at addr ffff0000d4bb88f8 by task repro/15862

[T15862]

[T15862] CPU: 0 UID: 0 PID: 15862 Comm: repro Not tainted 6.11.0-rc1-00293-gdefaf1a2113a-dirty #2

[T15862] Hardware name: QEMU QEMU Virtual Machine, BIOS edk2-20240524-5.fc40 05/24/2024

[T15862] Call trace:

[T15862] dump_backtrace+0x20c/0x220

[T15862] show_stack+0x2c/0x40

[T15862] dump_stack_lvl+0xf8/0x174

[T15862] print_report+0x170/0x4d8

[T15862] kasan_report+0xb8/0x1d4

[T15862] __asan_report_load4_noabort+0x20/0x2c

[T15862] taprio_dump+0xa0c/0xbb0

[T15862] tc_fill_qdi

/// 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