{"id":58580,"date":"2026-05-30T08:04:23","date_gmt":"2026-05-30T08:04:23","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=58580"},"modified":"2026-05-30T08:04:23","modified_gmt":"2026-05-30T08:04:23","slug":"apparmor-fix-string-overrun-due-to-missing-termination","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=58580","title":{"rendered":"apparmor: Fix string overrun due to missing termination_CVE-2026-46055"},"content":{"rendered":"

{“lastseen”:””,”description”:”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—“,”published”:”2026-05-27T12:57:13.671Z”,”modified”:”2026-05-30T10:47:04.582Z”,”type”:”cve”,”title”:”apparmor: Fix string overrun due to missing termination”,”source”:”Linux”,”references”:”https:\/\/git.kernel.org\/stable\/c\/4b877ef27adc8ec187b0418629169856e7264e01\\nhttps:\/\/git.kernel.org\/stable\/c\/828bf7929bedcb79b560b5b4e44f22abee07d31b”,”id”:”CVE-2026-46055″,”bulletinFamily”:””,”cwe”:null,”cvelist”:null,”sourceData”:”Linux Linux 93d4dbdc8da0b8a3ba86f4a08868084f8da872e1\\nLinux Linux 93d4dbdc8da0b8a3ba86f4a08868084f8da872e1\\nLinux Linux 7.0″,”sourceHref”:””,”cvss”:{“score”:7.1,”severity”:”HIGH”,”vector”:”CVSS:3.1\/AV:L\/AC:L\/PR:L\/UI:N\/S:U\/C:H\/I:N\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”Linux”,”version”:”93d4dbdc8da0b8a3ba86f4a08868084f8da872e1″,”vendor”:”Linux”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"

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