CVE-2026-74426 in Linux
Resumen
por MITRE • 2026-08-15
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.
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