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vuln-cve/data/2026/23xxx/CVE-2026-23407.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-23407",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-01-13T15:37:46.013Z",
"datePublished": "2026-04-01T08:36:37.197Z",
"dateUpdated": "2026-08-05T12:21:28.162Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:21:28.162Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix missing bounds check on DEFAULT table in verify_dfa()\n\nThe verify_dfa() function only checks DEFAULT_TABLE bounds when the state\nis not differentially encoded.\n\nWhen the verification loop traverses the differential encoding chain,\nit reads k = DEFAULT_TABLE[j] and uses k as an array index without\nvalidation. A malformed DFA with DEFAULT_TABLE[j] >= state_count,\ntherefore, causes both out-of-bounds reads and writes.\n\n[ 57.179855] ==================================================================\n[ 57.180549] BUG: KASAN: slab-out-of-bounds in verify_dfa+0x59a/0x660\n[ 57.180904] Read of size 4 at addr ffff888100eadec4 by task su/993\n\n[ 57.181554] CPU: 1 UID: 0 PID: 993 Comm: su Not tainted 6.19.0-rc7-next-20260127 #1 PREEMPT(lazy)\n[ 57.181558] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[ 57.181563] Call Trace:\n[ 57.181572] <TASK>\n[ 57.181577] dump_stack_lvl+0x5e/0x80\n[ 57.181596] print_report+0xc8/0x270\n[ 57.181605] ? verify_dfa+0x59a/0x660\n[ 57.181608] kasan_report+0x118/0x150\n[ 57.181620] ? verify_dfa+0x59a/0x660\n[ 57.181623] verify_dfa+0x59a/0x660\n[ 57.181627] aa_dfa_unpack+0x1610/0x1740\n[ 57.181629] ? __kmalloc_cache_noprof+0x1d0/0x470\n[ 57.181640] unpack_pdb+0x86d/0x46b0\n[ 57.181647] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 57.181653] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 57.181656] ? aa_unpack_nameX+0x1a8/0x300\n[ 57.181659] aa_unpack+0x20b0/0x4c30\n[ 57.181662] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 57.181664] ? stack_depot_save_flags+0x33/0x700\n[ 57.181681] ? kasan_save_track+0x4f/0x80\n[ 57.181683] ? kasan_save_track+0x3e/0x80\n[ 57.181686] ? __kasan_kmalloc+0x93/0xb0\n[ 57.181688] ? __kvmalloc_node_noprof+0x44a/0x780\n[ 57.181693] ? aa_simple_write_to_buffer+0x54/0x130\n[ 57.181697] ? policy_update+0x154/0x330\n[ 57.181704] aa_replace_profiles+0x15a/0x1dd0\n[ 57.181707] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 57.181710] ? __kvmalloc_node_noprof+0x44a/0x780\n[ 57.181712] ? aa_loaddata_alloc+0x77/0x140\n[ 57.181715] ? srso_alias_return_thunk+0x5/0xfbef5\n[ 57.181717] ? _copy_from_user+0x2a/0x70\n[ 57.181730] policy_update+0x17a/0x330\n[ 57.181733] profile_replace+0x153/0x1a0\n[ 57.181735] ? rw_verify_area+0x93/0x2d0\n[ 57.181740] vfs_write+0x235/0xab0\n[ 57.181745] ksys_write+0xb0/0x170\n[ 57.181748] do_syscall_64+0x8e/0x660\n[ 57.181762] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 57.181765] RIP: 0033:0x7f6192792eb2\n\nRemove the MATCH_FLAG_DIFF_ENCODE condition to validate all DEFAULT_TABLE\nentries unconditionally."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is triggered by writing a crafted AppArmor policy to the securityfs interface (`/sys/kernel/security/apparmor/.load` or `.replace`), which requires local system access.\nAC:L - The attacker fully controls the malformed DFA data (DEFAULT_TABLE entries) supplied in the crafted policy. No race conditions or unpredictable conditions are involved — the OOB access is deterministic.\nPR:L - AppArmor policy loading requires CAP_MAC_ADMIN, but the kernel default `unprivileged_userns_apparmor_policy=1` allows this capability to be obtained via unprivileged user namespaces, making it reachable by an unprivileged local user.\nUI:N - No user interaction is required; the attacker can craft and load the malicious AppArmor policy entirely on their own.\nS:U - The vulnerability results in kernel heap corruption within the same security authority (kernel space). No virtualization or sandbox boundary is crossed.\nC:H - The OOB read from `DEFAULT_TABLE(dfa)[j]` and `BASE_TABLE(dfa)[j]` allows reading arbitrary kernel heap memory beyond the allocated DFA tables, enabling kernel address/data disclosure.\nI:H - The OOB write via `BASE_TABLE(dfa)[j] |= MARK_DIFF_ENCODE` corrupts kernel heap memory at attacker-controlled offsets, providing a write primitive that could be leveraged for code execution.\nA:H - The OOB memory access causes kernel oops/crash as demonstrated by the KASAN report, resulting in system denial of service."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"security/apparmor/match.c"
],
"versions": [
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "555829fd91eaf0711e369b0a92aecb0f0aa3281f",
"status": "affected",
"versionType": "git"
},
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "a75e12ca90c9e70ba10fee1be2f63cdd63d91a7c",
"status": "affected",
"versionType": "git"
},
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "22094c996968a7c5b59cd3fc9fcbdfdd46d02fec",
"status": "affected",
"versionType": "git"
},
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "7c7cf05e0606f554c467e3a4dc49e2e578a755b4",
"status": "affected",
"versionType": "git"
},
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "76b4d36c5122866452d34d8f79985e191f9c3831",
"status": "affected",
"versionType": "git"
},
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "5a68e46dfe0c8c8ffc6f425ebc4cae6238566ecc",
"status": "affected",
"versionType": "git"
},
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "f39e126e56c6ec1930fae51ad6bca3dae2a4c3ed",
"status": "affected",
"versionType": "git"
},
{
"version": "031dcc8f4e84fea37dc6f78fdc7288aa7f8386c3",
"lessThan": "d352873bbefa7eb39995239d0b44ccdf8aaa79a4",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"security/apparmor/match.c"
],
"versions": [
{
"version": "4.17",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.17",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.253",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.203",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.169",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.130",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.77",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.18",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19.8",
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "5.10.253"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "5.15.203"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.1.169"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.6.130"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.12.77"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.18.18"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "6.19.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.17",
"versionEndExcluding": "7.0"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/555829fd91eaf0711e369b0a92aecb0f0aa3281f"
},
{
"url": "https://git.kernel.org/stable/c/a75e12ca90c9e70ba10fee1be2f63cdd63d91a7c"
},
{
"url": "https://git.kernel.org/stable/c/22094c996968a7c5b59cd3fc9fcbdfdd46d02fec"
},
{
"url": "https://git.kernel.org/stable/c/7c7cf05e0606f554c467e3a4dc49e2e578a755b4"
},
{
"url": "https://git.kernel.org/stable/c/76b4d36c5122866452d34d8f79985e191f9c3831"
},
{
"url": "https://git.kernel.org/stable/c/5a68e46dfe0c8c8ffc6f425ebc4cae6238566ecc"
},
{
"url": "https://git.kernel.org/stable/c/f39e126e56c6ec1930fae51ad6bca3dae2a4c3ed"
},
{
"url": "https://git.kernel.org/stable/c/d352873bbefa7eb39995239d0b44ccdf8aaa79a4"
}
],
"title": "apparmor: fix missing bounds check on DEFAULT table in verify_dfa()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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