CVE-2026-46254 (GCVE-0-2026-46254)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-06-03 15:49
VLAI
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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < ec737e7fdf2f0ba7b203d4ec72cc915978b10e7e (git)
Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < 23f112bd6144e815153462e12d313ac3e7027168 (git)
Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < cded636008bde2b397a7cf63b8299d7c303aaf6a (git)
Affected: e6e8bf418850d7958311a96ccfb594f2bcc8313e , < 64802f731214a51dfe3c6c27636b3ddafd003eb0 (git)
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Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (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 Create a notification for this product.
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        },
        {
          "url": "https://git.kernel.org/stable/c/64802f731214a51dfe3c6c27636b3ddafd003eb0"
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      "title": "AppArmor: Allow apparmor to handle unaligned dfa tables",
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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": "2026-06-03T15:49:50.994Z",
    "state": "PUBLISHED"
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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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        "configurations": [
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        "cveTags": [],
        "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\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": "2026-07-22T20:10:00.127",
        "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",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/64802f731214a51dfe3c6c27636b3ddafd003eb0"
          },
          {
            "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": "Analyzed",
        "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-01T01:06:10Z",
      "cve": "CVE-2026-46254",
      "id": "CVE-2026-46254",
      "initial_release_date": "2026-06-04T02:21:52Z",
      "product_status:known_affected": "641",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46254",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46254.json",
      "version": "15"
    }
  }
}



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Taxonomy of the tags.





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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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.