CVE-2026-46254
Status: AnalyzedMedium (5.5)—
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
Work around it by using the get_unaligned_xx() helpers.
Technical details traces, logs and code from the original report
[ 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
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Base score: 5.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.16%
- Percentile among all scored CVEs: 5
- Score date: 10/5/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- NVD-CWE-noinfo
References
Raw JSON (NVD)
Show
{
"id": "CVE-2026-46254",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e6e8bf418850d7958311a96ccfb594f2bcc8313e",
"lessThan": "ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "23f112bd6144e815153462e12d313ac3e7027168",
"versionType": "git"
},
{
"status": "affected",
"version": "e6e8bf418850d7958311a96ccfb594f2bcc8313e",
"lessThan": "cded636008bde2b397a7cf63b8299d7c303aaf6a",
"versionType": "git"
},
{
"status": "affected",
"version": "e6e8bf418850d7958311a96ccfb594f2bcc8313e",
"lessThan": "64802f731214a51dfe3c6c27636b3ddafd003eb0",
"versionType": "git"
}
],
"programFiles": [
"security/apparmor/match.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.14",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.4",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"security/apparmor/match.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-06-03T18:16:26.323",
"references": [
{
"url": "https://git.kernel.org/stable/c/23f112bd6144e815153462e12d313ac3e7027168",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/64802f731214a51dfe3c6c27636b3ddafd003eb0",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cded636008bde2b397a7cf63b8299d7c303aaf6a",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"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't always guaranteed and as such may trigger unaligned memory accesses\non various architectures. Resulting in the following\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] [<0000000000434c24>] dump_stack+0x8/0x18\n[ 74.633757] [<0000000000476438>] __warn+0xd8/0x100\n[ 74.696664] [<00000000004296d4>] warn_slowpath_fmt+0x34/0x74\n[ 74.771006] [<00000000008db28c>] aa_dfa_unpack+0x6cc/0x720\n[ 74.843062] [<00000000008e643c>] unpack_pdb+0xbc/0x7e0\n[ 74.910545] [<00000000008e7740>] unpack_profile+0xbe0/0x1300\n[ 74.984888] [<00000000008e82e0>] aa_unpack+0xe0/0x6a0\n[ 75.051226] [<00000000008e3ec4>] aa_replace_profiles+0x64/0x1160\n[ 75.130144] [<00000000008d4d90>] policy_update+0xf0/0x280\n[ 75.201057] [<00000000008d4fc8>] profile_replace+0xa8/0x100\n[ 75.274258] [<0000000000766bd0>] vfs_write+0x90/0x420\n[ 75.340594] [<00000000007670cc>] ksys_write+0x4c/0xe0\n[ 75.406932] [<0000000000767174>] sys_write+0x14/0x40\n[ 75.472126] [<0000000000406174>] 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\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 alineación de 8 bytes no siempre está 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] [<0000000000434c24>] dump_stack+0x8/0x18\n[ 74.633757] [<0000000000476438>] __warn+0xd8/0x100\n[ 74.696664] [<00000000004296d4>] warn_slowpath_fmt+0x34/0x74\n[ 74.771006] [<00000000008db28c>] aa_dfa_unpack+0x6cc/0x720\n[ 74.843062] [<00000000008e643c>] unpack_pdb+0xbc/0x7e0\n[ 74.910545] [<00000000008e7740>] unpack_profile+0xbe0/0x1300\n[ 74.984888] [<00000000008e82e0>] aa_unpack+0xe0/0x6a0\n[ 75.051226] [<00000000008e3ec4>] aa_replace_profiles+0x64/0x1160\n[ 75.130144] [<00000000008d4d90>] policy_update+0xf0/0x280\n[ 75.201057] [<00000000008d4fc8>] profile_replace+0xa8/0x100\n[ 75.274258] [<0000000000766bd0>] vfs_write+0x90/0x420\n[ 75.340594] [<00000000007670cc>] ksys_write+0x4c/0xe0\n[ 75.406932] [<0000000000767174>] sys_write+0x14/0x40\n[ 75.472126] [<0000000000406174>] 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()."
}
],
"lastModified": "2026-07-22T20:10:00.127",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9460E9E9-5019-444D-B0AD-BB3A9C752456",
"versionEndExcluding": "6.12.75",
"versionStartIncluding": "4.11"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "BF463CB7-1F58-4607-B847-77ED23E4B9B7",
"versionEndExcluding": "6.18.14",
"versionStartIncluding": "6.13"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092",
"versionEndExcluding": "6.19.4",
"versionStartIncluding": "6.19"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}