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.

https://git.kernel.org/stable/c/0b70716081c6462be9b2928ad736d0d527b09678

https://git.kernel.org/stable/c/23b3d457d8387bcb2a61063a9e520063ada9335f

https://git.kernel.org/stable/c/67fb48c4a0874953212321cd5d57fdb4900dbc31

https://git.kernel.org/stable/c/70b2842734d831c908474779bb8a76daf55f782c

https://git.kernel.org/stable/c/867b3ea146a041023bfcd258e6db516b1bb28f19

https://git.kernel.org/stable/c/d5b17474feed3c30991f07affa2473adbad95055

https://git.kernel.org/stable/c/d648cc2069eb081707c061849046d909f57c78b1

https://git.kernel.org/stable/c/ea19edf71721cd42f923e3c70f4ff995b422fe3b

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["fs/afs/super.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"67fb48c4a0874953212321cd5d57fdb4900dbc31","versionType":"git","status":"affected"},{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"d648cc2069eb081707c061849046d909f57c78b1","versionType":"git","status":"affected"},{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"d5b17474feed3c30991f07affa2473adbad95055","versionType":"git","status":"affected"},{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"867b3ea146a041023bfcd258e6db516b1bb28f19","versionType":"git","status":"affected"},{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"ea19edf71721cd42f923e3c70f4ff995b422fe3b","versionType":"git","status":"affected"},{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"23b3d457d8387bcb2a61063a9e520063ada9335f","versionType":"git","status":"affected"},{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"70b2842734d831c908474779bb8a76daf55f782c","versionType":"git","status":"affected"},{"version":"80548b03991f58758a336424a90bf9f988e3b077","lessThan":"0b70716081c6462be9b2928ad736d0d527b09678","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["fs/afs/super.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"5.2","status":"affected"},{"version":"0","lessThan":"5.2","versionType":"semver","status":"unaffected"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2-rc2","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]