CVE-2026-74426

afs: fix NULL pointer dereference in afs_get_tree()

State: Published
Severity: Not scored
Published: Aug 15, 2026
Updated: Aug 17, 2026
Reserved: Aug 15, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	80548b03991f58758a336424a90bf9f988e3b077 to before 67fb48c4a0874953212321cd5d57fdb4900dbc31Affected 80548b03991f58758a336424a90bf9f988e3b077 to before d648cc2069eb081707c061849046d909f57c78b1Affected 80548b03991f58758a336424a90bf9f988e3b077 to before d5b17474feed3c30991f07affa2473adbad95055Affected 80548b03991f58758a336424a90bf9f988e3b077 to before 867b3ea146a041023bfcd258e6db516b1bb28f19Affected 80548b03991f58758a336424a90bf9f988e3b077 to before ea19edf71721cd42f923e3c70f4ff995b422fe3bAffected 80548b03991f58758a336424a90bf9f988e3b077 to before 23b3d457d8387bcb2a61063a9e520063ada9335fAffected 80548b03991f58758a336424a90bf9f988e3b077 to before 70b2842734d831c908474779bb8a76daf55f782cAffected 80548b03991f58758a336424a90bf9f988e3b077 to before 0b70716081c6462be9b2928ad736d0d527b09678Affected
LinuxLinux	5.2Affected before 5.2Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

80548b03991f58758a336424a90bf9f988e3b077 to before 67fb48c4a0874953212321cd5d57fdb4900dbc31Affected
80548b03991f58758a336424a90bf9f988e3b077 to before d648cc2069eb081707c061849046d909f57c78b1Affected
80548b03991f58758a336424a90bf9f988e3b077 to before d5b17474feed3c30991f07affa2473adbad95055Affected
80548b03991f58758a336424a90bf9f988e3b077 to before 867b3ea146a041023bfcd258e6db516b1bb28f19Affected
80548b03991f58758a336424a90bf9f988e3b077 to before ea19edf71721cd42f923e3c70f4ff995b422fe3bAffected
80548b03991f58758a336424a90bf9f988e3b077 to before 23b3d457d8387bcb2a61063a9e520063ada9335fAffected
80548b03991f58758a336424a90bf9f988e3b077 to before 70b2842734d831c908474779bb8a76daf55f782cAffected
80548b03991f58758a336424a90bf9f988e3b077 to before 0b70716081c6462be9b2928ad736d0d527b09678Affected

LinuxLinux

5.2Affected
before 5.2Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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