PT-2026-43922 · Linux · Linux

Published

2026-05-27

·

Updated

2026-05-27

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CVE-2026-46055

None

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In the Linux kernel, the following vulnerability has been resolved:
apparmor: Fix string overrun due to missing termination
When booting Ubuntu 26.04 with Linux 7.0-rc4 on an ARM64 Qualcomm Snapdragon X1 we see a string buffer overrun:
BUG: KASAN: slab-out-of-bounds in aa dfa match (security/apparmor/match.c:535) Read of size 1 at addr ffff0008901cc000 by task snap-update-ns/2120
CPU: 5 UID: 60578 PID: 2120 Comm: snap-update-ns Not tainted 7.0.0-rc4+ #22 PREEMPTLAZY Hardware name: LENOVO 83ED/LNVNB161216, BIOS NHCN60WW 09/11/2025 Call trace: show stack (arch/arm64/kernel/stacktrace.c:501) (C) dump stack lvl (lib/dump stack.c:122) print report (mm/kasan/report.c:379 mm/kasan/report.c:482) kasan report (mm/kasan/report.c:597) asan report load1 noabort (mm/kasan/report generic.c:378) aa dfa match (security/apparmor/match.c:535) match mnt path str (security/apparmor/mount.c:244 security/apparmor/mount.c:336) match mnt (security/apparmor/mount.c:371) aa bind mount (security/apparmor/mount.c:447 (discriminator 4)) apparmor sb mount (security/apparmor/lsm.c:719 (discriminator 1)) security sb mount (security/security.c:1062 (discriminator 31)) path mount (fs/namespace.c:4101) arm64 sys mount (fs/namespace.c:4172 fs/namespace.c:4361 fs/namespace.c:4338 fs/namespace.c:4338) invoke syscall.constprop.0 (arch/arm64/kernel/syscall.c:35 arch/arm64/kernel/syscall.c:49) el0 svc common.constprop.0 (./include/linux/thread info.h:142 (discriminator 2) arch/arm64/kernel/syscall.c:140 (discriminator 2)) do el0 svc (arch/arm64/kernel/syscall.c:152) el0 svc (arch/arm64/kernel/entry-common.c:80 arch/arm64/kernel/entry-common.c:725) el0t 64 sync handler (arch/arm64/kernel/entry-common.c:744) el0t 64 sync (arch/arm64/kernel/entry.S:596)
Allocated by task 2120: kasan save stack (mm/kasan/common.c:58) kasan save track (./arch/arm64/include/asm/current.h:19 mm/kasan/common.c:70 mm/kasan/common.c:79) kasan save alloc info (mm/kasan/generic.c:571) kasan kmalloc (mm/kasan/common.c:419) kmalloc noprof (./include/linux/kasan.h:263 mm/slub.c:5260 mm/slub.c:5272) aa get buffer (security/apparmor/lsm.c:2201) aa bind mount (security/apparmor/mount.c:442) apparmor sb mount (security/apparmor/lsm.c:719 (discriminator 1)) security sb mount (security/security.c:1062 (discriminator 31)) path mount (fs/namespace.c:4101) arm64 sys mount (fs/namespace.c:4172 fs/namespace.c:4361 fs/namespace.c:4338 fs/namespace.c:4338) invoke syscall.constprop.0 (arch/arm64/kernel/syscall.c:35 arch/arm64/kernel/syscall.c:49) el0 svc common.constprop.0 (./include/linux/thread info.h:142 (discriminator 2) arch/arm64/kernel/syscall.c:140 (discriminator 2)) do el0 svc (arch/arm64/kernel/syscall.c:152) el0 svc (arch/arm64/kernel/entry-common.c:80 arch/arm64/kernel/entry-common.c:725) el0t 64 sync handler (arch/arm64/kernel/entry-common.c:744) el0t 64 sync (arch/arm64/kernel/entry.S:596)
The buggy address belongs to the object at ffff0008901ca000 which belongs to the cache kmalloc-rnd-06-8k of size 8192 The buggy address is located 0 bytes to the right of allocated 8192-byte region [ffff0008901ca000, ffff0008901cc000)
The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9101c8 head: order:3 mapcount:0 entire mapcount:0 nr pages mapped:-1 pincount:0 flags: 0x8000000000000040(head|zone=2) page type: f5(slab) raw: 8000000000000040 ffff000800016c40 fffffdffe2d14e10 ffff000800015c70 raw: 0000000000000000 0000000800010001 00000000f5000000 0000000000000000 head: 8000000000000040 ffff000800016c40 fffffdffe2d14e10 ffff000800015c70 head: 0000000000000000 0000000800010001 00000000f5000000 0000000000000000 head: 8000000000000003 fffffdffe2407201 fffffdffffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff0008901cbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0008 ---truncated---

Related Identifiers

CVE-2026-46055

Affected Products

Linux