CVE-2026-46254 (GCVE-0-2026-46254)
Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-10-30 12:26
VLAI
EPSS
VEX
Title
AppArmor: Allow apparmor to handle unaligned dfa tables
Summary
In the Linux kernel, the following vulnerability has been resolved:
AppArmor: Allow apparmor to handle unaligned dfa tables
The dfa tables can originate from kernel or userspace and 8-byte alignment
isn't always guaranteed and as such may trigger unaligned memory accesses
on various architectures. Resulting in the following
[ 73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720
[ 74.015867] Modules linked in: binfmt_misc evdev flash sg drm drm_panel_orientation_quirks backlight i2c_core configfs nfnetlink autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid sr_mod hid cdrom
sd_mod ata_generic ohci_pci ehci_pci ehci_hcd ohci_hcd pata_ali libata sym53c8xx scsi_transport_spi tg3 scsi_mod usbcore libphy scsi_common mdio_bus usb_common
[ 74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE
[ 74.536543] Call Trace:
[ 74.568561] [<0000000000434c24>] dump_stack+0x8/0x18
[ 74.633757] [<0000000000476438>] __warn+0xd8/0x100
[ 74.696664] [<00000000004296d4>] warn_slowpath_fmt+0x34/0x74
[ 74.771006] [<00000000008db28c>] aa_dfa_unpack+0x6cc/0x720
[ 74.843062] [<00000000008e643c>] unpack_pdb+0xbc/0x7e0
[ 74.910545] [<00000000008e7740>] unpack_profile+0xbe0/0x1300
[ 74.984888] [<00000000008e82e0>] aa_unpack+0xe0/0x6a0
[ 75.051226] [<00000000008e3ec4>] aa_replace_profiles+0x64/0x1160
[ 75.130144] [<00000000008d4d90>] policy_update+0xf0/0x280
[ 75.201057] [<00000000008d4fc8>] profile_replace+0xa8/0x100
[ 75.274258] [<0000000000766bd0>] vfs_write+0x90/0x420
[ 75.340594] [<00000000007670cc>] ksys_write+0x4c/0xe0
[ 75.406932] [<0000000000767174>] sys_write+0x14/0x40
[ 75.472126] [<0000000000406174>] linux_sparc_syscall+0x34/0x44
[ 75.548802] ---[ end trace 0000000000000000 ]---
[ 75.609503] dfa blob stream 0xfff0000008926b96 not aligned.
[ 75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720
Work around it by using the get_unaligned_xx() helpers.
Severity
5.5 (Medium)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e6e8bf418850d7958311a96ccfb594f2bcc8313e , < 60d175ecba4d067bd3379617eb09a905de476fcc
(git)
Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < bd00629b527888a08a5222640fea045c6f64f5b5 (git) Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e (git) Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < 23f112bd6144e815153462e12d313ac3e7027168 (git) Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < cded636008bde2b397a7cf63b8299d7c303aaf6a (git) Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < 64802f731214a51dfe3c6c27636b3ddafd003eb0 (git) |
guessed | |
| Linux | Linux |
Affected:
4.11
Unaffected: 0 , < 4.11 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
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},
{
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"status": "unaffected",
"version": "6.19.4",
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},
{
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
}
]
}
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nAppArmor: Allow apparmor to handle unaligned dfa tables\n\nThe dfa tables can originate from kernel or userspace and 8-byte alignment\nisn\u0027t always guaranteed and as such may trigger unaligned memory accesses\non various architectures. Resulting in the following\n\n[\u00a0\u00a0 73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720\n[\u00a0\u00a0 74.015867] Modules linked in: binfmt_misc evdev flash sg drm drm_panel_orientation_quirks backlight i2c_core configfs nfnetlink autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid sr_mod hid cdrom\nsd_mod ata_generic ohci_pci ehci_pci ehci_hcd ohci_hcd pata_ali libata sym53c8xx scsi_transport_spi tg3 scsi_mod usbcore libphy scsi_common mdio_bus usb_common\n[\u00a0\u00a0 74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE\n[\u00a0\u00a0 74.536543] Call Trace:\n[\u00a0\u00a0 74.568561] [\u003c0000000000434c24\u003e] dump_stack+0x8/0x18\n[\u00a0\u00a0 74.633757] [\u003c0000000000476438\u003e] __warn+0xd8/0x100\n[\u00a0\u00a0 74.696664] [\u003c00000000004296d4\u003e] warn_slowpath_fmt+0x34/0x74\n[\u00a0\u00a0 74.771006] [\u003c00000000008db28c\u003e] aa_dfa_unpack+0x6cc/0x720\n[\u00a0\u00a0 74.843062] [\u003c00000000008e643c\u003e] unpack_pdb+0xbc/0x7e0\n[\u00a0\u00a0 74.910545] [\u003c00000000008e7740\u003e] unpack_profile+0xbe0/0x1300\n[\u00a0\u00a0 74.984888] [\u003c00000000008e82e0\u003e] aa_unpack+0xe0/0x6a0\n[\u00a0\u00a0 75.051226] [\u003c00000000008e3ec4\u003e] aa_replace_profiles+0x64/0x1160\n[\u00a0\u00a0 75.130144] [\u003c00000000008d4d90\u003e] policy_update+0xf0/0x280\n[\u00a0\u00a0 75.201057] [\u003c00000000008d4fc8\u003e] profile_replace+0xa8/0x100\n[\u00a0\u00a0 75.274258] [\u003c0000000000766bd0\u003e] vfs_write+0x90/0x420\n[\u00a0\u00a0 75.340594] [\u003c00000000007670cc\u003e] ksys_write+0x4c/0xe0\n[\u00a0\u00a0 75.406932] [\u003c0000000000767174\u003e] sys_write+0x14/0x40\n[\u00a0\u00a0 75.472126] [\u003c0000000000406174\u003e] linux_sparc_syscall+0x34/0x44\n[\u00a0\u00a0 75.548802] ---[ end trace 0000000000000000 ]---\n[\u00a0\u00a0 75.609503] dfa blob stream 0xfff0000008926b96 not aligned.\n[\u00a0\u00a0 75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720\n\nWork around it by using the get_unaligned_xx() helpers."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:26:13.086Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/60d175ecba4d067bd3379617eb09a905de476fcc"
},
{
"url": "https://git.kernel.org/stable/c/bd00629b527888a08a5222640fea045c6f64f5b5"
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{
"url": "https://git.kernel.org/stable/c/ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e"
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{
"url": "https://git.kernel.org/stable/c/23f112bd6144e815153462e12d313ac3e7027168"
},
{
"url": "https://git.kernel.org/stable/c/cded636008bde2b397a7cf63b8299d7c303aaf6a"
},
{
"url": "https://git.kernel.org/stable/c/64802f731214a51dfe3c6c27636b3ddafd003eb0"
}
],
"title": "AppArmor: Allow apparmor to handle unaligned dfa tables",
"x_generator": {
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}
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-46254",
"datePublished": "2026-06-03T15:49:50.994Z",
"dateReserved": "2026-05-13T15:03:33.107Z",
"dateUpdated": "2026-10-30T12:26:13.086Z",
"state": "PUBLISHED"
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"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"date": "2026-10-31",
"epss": "0.00156",
"percentile": "0.04732"
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"microsoft_vex": {
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"cve": "CVE-2026-46254",
"id": "msrc_CVE-2026-46254",
"initial_release_date": "2026-06-05T01:01:32.000Z",
"product_status:known_affected": "7",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "AppArmor: Allow apparmor to handle unaligned dfa tables",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46254.json",
"version": "8"
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"nvd": {
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{
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"versionType": "semver"
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{
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"version": "6.1.191",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
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{
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{
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{
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"configurations": [
{
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nAppArmor: Allow apparmor to handle unaligned dfa tables\n\nThe dfa tables can originate from kernel or userspace and 8-byte alignment\nisn\u0027t always guaranteed and as such may trigger unaligned memory accesses\non various architectures. Resulting in the following\n\n[\u00a0\u00a0 73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720\n[\u00a0\u00a0 74.015867] Modules linked in: binfmt_misc evdev flash sg drm drm_panel_orientation_quirks backlight i2c_core configfs nfnetlink autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid sr_mod hid cdrom\nsd_mod ata_generic ohci_pci ehci_pci ehci_hcd ohci_hcd pata_ali libata sym53c8xx scsi_transport_spi tg3 scsi_mod usbcore libphy scsi_common mdio_bus usb_common\n[\u00a0\u00a0 74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE\n[\u00a0\u00a0 74.536543] Call Trace:\n[\u00a0\u00a0 74.568561] [\u003c0000000000434c24\u003e] dump_stack+0x8/0x18\n[\u00a0\u00a0 74.633757] [\u003c0000000000476438\u003e] __warn+0xd8/0x100\n[\u00a0\u00a0 74.696664] [\u003c00000000004296d4\u003e] warn_slowpath_fmt+0x34/0x74\n[\u00a0\u00a0 74.771006] [\u003c00000000008db28c\u003e] aa_dfa_unpack+0x6cc/0x720\n[\u00a0\u00a0 74.843062] [\u003c00000000008e643c\u003e] unpack_pdb+0xbc/0x7e0\n[\u00a0\u00a0 74.910545] [\u003c00000000008e7740\u003e] unpack_profile+0xbe0/0x1300\n[\u00a0\u00a0 74.984888] [\u003c00000000008e82e0\u003e] aa_unpack+0xe0/0x6a0\n[\u00a0\u00a0 75.051226] [\u003c00000000008e3ec4\u003e] aa_replace_profiles+0x64/0x1160\n[\u00a0\u00a0 75.130144] [\u003c00000000008d4d90\u003e] policy_update+0xf0/0x280\n[\u00a0\u00a0 75.201057] [\u003c00000000008d4fc8\u003e] profile_replace+0xa8/0x100\n[\u00a0\u00a0 75.274258] [\u003c0000000000766bd0\u003e] vfs_write+0x90/0x420\n[\u00a0\u00a0 75.340594] [\u003c00000000007670cc\u003e] ksys_write+0x4c/0xe0\n[\u00a0\u00a0 75.406932] [\u003c0000000000767174\u003e] sys_write+0x14/0x40\n[\u00a0\u00a0 75.472126] [\u003c0000000000406174\u003e] linux_sparc_syscall+0x34/0x44\n[\u00a0\u00a0 75.548802] ---[ end trace 0000000000000000 ]---\n[\u00a0\u00a0 75.609503] dfa blob stream 0xfff0000008926b96 not aligned.\n[\u00a0\u00a0 75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720\n\nWork around it by using the get_unaligned_xx() helpers."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nAppArmor: Permitir que apparmor maneje tablas dfa no alineadas\n\nLas tablas dfa pueden originarse desde el kernel o el espacio de usuario y la alineaci\u00f3n de 8 bytes no siempre est\u00e1 garantizada y como tal puede desencadenar accesos a memoria no alineados en varias arquitecturas. Resultando en lo siguiente\n\n[ 73.901376] WARNING: CPU: 0 PID: 341 at security/apparmor/match.c:316 aa_dfa_unpack+0x6cc/0x720\n[ 74.015867] Modules linked in: binfmt_misc evdev flash sg drm drm_panel_orientation_quirks backlight i2c_core configfs nfnetlink autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid sr_mod hid cdrom\nsd_mod ata_generic ohci_pci ehci_pci ehci_hcd ohci_hcd pata_ali libata sym53c8xx scsi_transport_spi tg3 scsi_mod usbcore libphy scsi_common mdio_bus usb_common\n[ 74.428977] CPU: 0 UID: 0 PID: 341 Comm: apparmor_parser Not tainted 6.18.0-rc6+ #9 NONE\n[ 74.536543] Call Trace:\n[ 74.568561] [\u003c0000000000434c24\u003e] dump_stack+0x8/0x18\n[ 74.633757] [\u003c0000000000476438\u003e] __warn+0xd8/0x100\n[ 74.696664] [\u003c00000000004296d4\u003e] warn_slowpath_fmt+0x34/0x74\n[ 74.771006] [\u003c00000000008db28c\u003e] aa_dfa_unpack+0x6cc/0x720\n[ 74.843062] [\u003c00000000008e643c\u003e] unpack_pdb+0xbc/0x7e0\n[ 74.910545] [\u003c00000000008e7740\u003e] unpack_profile+0xbe0/0x1300\n[ 74.984888] [\u003c00000000008e82e0\u003e] aa_unpack+0xe0/0x6a0\n[ 75.051226] [\u003c00000000008e3ec4\u003e] aa_replace_profiles+0x64/0x1160\n[ 75.130144] [\u003c00000000008d4d90\u003e] policy_update+0xf0/0x280\n[ 75.201057] [\u003c00000000008d4fc8\u003e] profile_replace+0xa8/0x100\n[ 75.274258] [\u003c0000000000766bd0\u003e] vfs_write+0x90/0x420\n[ 75.340594] [\u003c00000000007670cc\u003e] ksys_write+0x4c/0xe0\n[ 75.406932] [\u003c0000000000767174\u003e] sys_write+0x14/0x40\n[ 75.472126] [\u003c0000000000406174\u003e] linux_sparc_syscall+0x34/0x44\n[ 75.548802] ---[ end trace 0000000000000000 ]---\n[ 75.609503] dfa blob stream 0xfff0000008926b96 not aligned.\n[ 75.682695] Kernel unaligned access at TPC[8db2a8] aa_dfa_unpack+0x6e8/0x720\n\nSolucionarlo utilizando las funciones auxiliares get_unaligned_xx()."
}
],
"id": "CVE-2026-46254",
"lastModified": "2026-10-30T13:19:00.450",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2026-06-03T18:16:26.323",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/23f112bd6144e815153462e12d313ac3e7027168"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/60d175ecba4d067bd3379617eb09a905de476fcc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/64802f731214a51dfe3c6c27636b3ddafd003eb0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/bd00629b527888a08a5222640fea045c6f64f5b5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/cded636008bde2b397a7cf63b8299d7c303aaf6a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-28T07:41:49+00:00",
"cve": "CVE-2026-46254",
"id": "CVE-2026-46254",
"initial_release_date": "2026-06-03T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: AppArmor: Allow apparmor to handle unaligned dfa tables",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46254.json",
"version": "3"
}
}
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.