CVE-2026-74426

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

afs: fix NULL pointer dereference in afs_get_tree()

afs_alloc_sbi() uses kzalloc for memory allocation. And, if

ctx->dyn_root is not null, as->cell and as->volume are null.

In trace_afs_get_tree() they are dereferenced.

KASAN error message:

KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

CPU: 2 PID: 18478 Comm: syz-executor.7 Not tainted 5.10.246-syzkaller #0

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1

04/01/2014

RIP: 0010:perf_trace_afs_get_tree+0x1d9/0x550

include/trace/events/afs.h:1365

Call Trace:

trace_afs_get_tree include/trace/events/afs.h:1365 [inline]

afs_get_tree+0x922/0x1350 fs/afs/super.c:599

vfs_get_tree+0x8e/0x300 fs/super.c:1572

do_new_mount fs/namespace.c:3011 [inline]

path_mount+0x14a5/0x2220 fs/namespace.c:3341

do_mount fs/namespace.c:3354 [inline]

__do_sys_mount fs/namespace.c:3562 [inline]

__se_sys_mount fs/namespace.c:3539 [inline]

__x64_sys_mount+0x283/0x300 fs/namespace.c:3539

do_syscall_64+0x33/0x50 arch/x86/entry/common.c:46

entry_SYSCALL_64_after_hwframe+0x67/0xd1

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.