CVE-2026-46055

Estado: AnalizadaAlta (7.1)—

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:

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)

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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 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

Detalles técnicos trazas, registros y código del informe original

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

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)

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---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 4
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %
Impacto secundarioT1005 Data from Local Systemcollection60 %

Buffer overrun en AppArmor (AV:L, PR:L) permite escalada de privilegios locales; KASAN detecta lectura fuera de límites causando DoS del kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-Other

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-46055",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "version": "3.1",
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          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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  "published": "2026-05-27T14:17:25.190",
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: Fix string overrun due to missing termination\n\nWhen booting Ubuntu 26.04 with Linux 7.0-rc4 on an ARM64 Qualcomm\nSnapdragon X1 we see a string buffer overrun:\n\nBUG: KASAN: slab-out-of-bounds in aa_dfa_match (security/apparmor/match.c:535)\nRead of size 1 at addr ffff0008901cc000 by task snap-update-ns/2120\n\nCPU: 5 UID: 60578 PID: 2120 Comm: snap-update-ns Not tainted 7.0.0-rc4+ #22 PREEMPTLAZY\nHardware name: LENOVO 83ED/LNVNB161216, BIOS NHCN60WW 09/11/2025\nCall trace:\nshow_stack (arch/arm64/kernel/stacktrace.c:501) (C)\ndump_stack_lvl (lib/dump_stack.c:122)\nprint_report (mm/kasan/report.c:379 mm/kasan/report.c:482)\nkasan_report (mm/kasan/report.c:597)\n__asan_report_load1_noabort (mm/kasan/report_generic.c:378)\naa_dfa_match (security/apparmor/match.c:535)\nmatch_mnt_path_str (security/apparmor/mount.c:244 security/apparmor/mount.c:336)\nmatch_mnt (security/apparmor/mount.c:371)\naa_bind_mount (security/apparmor/mount.c:447 (discriminator 4))\napparmor_sb_mount (security/apparmor/lsm.c:719 (discriminator 1))\nsecurity_sb_mount (security/security.c:1062 (discriminator 31))\npath_mount (fs/namespace.c:4101)\n__arm64_sys_mount (fs/namespace.c:4172 fs/namespace.c:4361 fs/namespace.c:4338 fs/namespace.c:4338)\ninvoke_syscall.constprop.0 (arch/arm64/kernel/syscall.c:35 arch/arm64/kernel/syscall.c:49)\nel0_svc_common.constprop.0 (./include/linux/thread_info.h:142 (discriminator 2) arch/arm64/kernel/syscall.c:140 (discriminator 2))\ndo_el0_svc (arch/arm64/kernel/syscall.c:152)\nel0_svc (arch/arm64/kernel/entry-common.c:80 arch/arm64/kernel/entry-common.c:725)\nel0t_64_sync_handler (arch/arm64/kernel/entry-common.c:744)\nel0t_64_sync (arch/arm64/kernel/entry.S:596)\n\nAllocated by task 2120:\nkasan_save_stack (mm/kasan/common.c:58)\nkasan_save_track (./arch/arm64/include/asm/current.h:19 mm/kasan/common.c:70 mm/kasan/common.c:79)\nkasan_save_alloc_info (mm/kasan/generic.c:571)\n__kasan_kmalloc (mm/kasan/common.c:419)\n__kmalloc_noprof (./include/linux/kasan.h:263 mm/slub.c:5260 mm/slub.c:5272)\naa_get_buffer (security/apparmor/lsm.c:2201)\naa_bind_mount (security/apparmor/mount.c:442)\napparmor_sb_mount (security/apparmor/lsm.c:719 (discriminator 1))\nsecurity_sb_mount (security/security.c:1062 (discriminator 31))\npath_mount (fs/namespace.c:4101)\n__arm64_sys_mount (fs/namespace.c:4172 fs/namespace.c:4361 fs/namespace.c:4338 fs/namespace.c:4338)\ninvoke_syscall.constprop.0 (arch/arm64/kernel/syscall.c:35 arch/arm64/kernel/syscall.c:49)\nel0_svc_common.constprop.0 (./include/linux/thread_info.h:142 (discriminator 2) arch/arm64/kernel/syscall.c:140 (discriminator 2))\ndo_el0_svc (arch/arm64/kernel/syscall.c:152)\nel0_svc (arch/arm64/kernel/entry-common.c:80 arch/arm64/kernel/entry-common.c:725)\nel0t_64_sync_handler (arch/arm64/kernel/entry-common.c:744)\nel0t_64_sync (arch/arm64/kernel/entry.S:596)\n\nThe buggy address belongs to the object at ffff0008901ca000\nwhich belongs to the cache kmalloc-rnd-06-8k of size 8192\nThe buggy address is located 0 bytes to the right of\nallocated 8192-byte region [ffff0008901ca000, ffff0008901cc000)\n\nThe buggy address belongs to the physical page:\npage: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9101c8\nhead: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:-1 pincount:0\nflags: 0x8000000000000040(head|zone=2)\npage_type: f5(slab)\nraw: 8000000000000040 ffff000800016c40 fffffdffe2d14e10 ffff000800015c70\nraw: 0000000000000000 0000000800010001 00000000f5000000 0000000000000000\nhead: 8000000000000040 ffff000800016c40 fffffdffe2d14e10 ffff000800015c70\nhead: 0000000000000000 0000000800010001 00000000f5000000 0000000000000000\nhead: 8000000000000003 fffffdffe2407201 fffffdffffffffff 00000000ffffffff\nhead: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\nffff0008901cbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\nffff0008\n---truncated---"
    }
  ],
  "lastModified": "2026-06-17T10:52:59.437",
  "configurations": [
    {
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        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "7.0.4",
              "versionStartIncluding": "7.0"
            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}