CVE-2026-46294 (GCVE-0-2026-46294)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:46 – Updated: 2026-06-14 18:07
VLAI
Title
dm: fix a buffer overflow in ioctl processing
Summary
In the Linux kernel, the following vulnerability has been resolved: dm: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c8c5311237448f6ffeecc9aec2362e3692623668 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 526ff9126a0ae087b65726e1faf31114c718020d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d271631023cbe1cbe7c31a0275ab797883be6e0a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5af6a879e915ae7bcd83695c316ebb32e1c61bc2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8daa6c708ef524089ae43f2aed9190acb26d7df8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2fa49cc884f6496a915c35621ba4da35649bf159 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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        },
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          "url": "https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159"
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    "dateUpdated": "2026-06-14T18:07:06.194Z",
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If \\\"outptr\\\" points past \\\"outbuf + len\\\", the arithmetics wraps around\\n   and the variable \\\"remaining\\\" contains unusually high number\\n6. With \\\"remaining\\\" being high, the code writes more data past the end of\\n   the buffer\\n\\nLuckily, this bug has no security implications because:\\n1. Only root can issue device mapper ioctls\\n2. The commonly used libraries that communicate with device mapper\\n   (libdevmapper and devicemapper-rs) use buffer size that is aligned to\\n   8 bytes - thus, \\\"outptr = align_ptr(outptr)\\\" can\u0027t overshoot the input\\n   buffer and the bug can\u0027t happen accidentally\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\ndm: corrige un desbordamiento de b\u00fafer en el procesamiento de ioctl\\n\\nTony Asleson (usando Claude) encontr\u00f3 un desbordamiento de b\u00fafer en dm-ioctl en la funci\u00f3n retrieve_status:\\n\\n1. El c\u00f3digo en retrieve_status verifica que la cadena de salida cabe en el b\u00fafer de salida y escribe la cadena de salida all\u00ed\\n2. Luego, el c\u00f3digo alinea la variable \u0027outptr\u0027 al siguiente l\u00edmite de 8 bytes:\\n\\toutptr = align_ptr(outptr);\\n3. La alineaci\u00f3n no verifica el desbordamiento, por lo que \u0027outptr\u0027 podr\u00eda apuntar m\u00e1s all\u00e1 del final del b\u00fafer\\n4. El bucle \u0027for\u0027 se itera de nuevo, ejecuta:\\n\\tremaining = len - (outptr - outbuf);\\n5. Si \u0027outptr\u0027 apunta m\u00e1s all\u00e1 de \u0027outbuf + len\u0027, la aritm\u00e9tica se desborda y la variable \u0027remaining\u0027 contiene un n\u00famero inusualmente alto\\n6. Siendo \u0027remaining\u0027 alto, el c\u00f3digo escribe m\u00e1s datos m\u00e1s all\u00e1 del final del b\u00fafer\\n\\nAfortunadamente, este error no tiene implicaciones de seguridad porque:\\n1. Solo root puede emitir ioctls del mapeador de dispositivos\\n2. Las bibliotecas com\u00fanmente utilizadas que se comunican con el mapeador de dispositivos (libdevmapper y devicemapper-rs) usan un tama\u00f1o de b\u00fafer que est\u00e1 alineado a 8 bytes; por lo tanto, \u0027outptr = align_ptr(outptr)\u0027 no puede exceder el b\u00fafer de entrada y el error no puede ocurrir accidentalmente\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/md/dm-ioctl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"c8c5311237448f6ffeecc9aec2362e3692623668\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"526ff9126a0ae087b65726e1faf31114c718020d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"d271631023cbe1cbe7c31a0275ab797883be6e0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"5af6a879e915ae7bcd83695c316ebb32e1c61bc2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"8daa6c708ef524089ae43f2aed9190acb26d7df8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"2fa49cc884f6496a915c35621ba4da35649bf159\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/md/dm-ioctl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.12.1\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"E03287AA-1109-4662-85B8-5E824B2EA646\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.140\",\"matchCriteriaId\":\"A1A92866-F406-43B5-B2D1-CFC274753E9D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.88\",\"matchCriteriaId\":\"5AFBE0EC-CCDF-4207-AE92-ABF958125CA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.30\",\"matchCriteriaId\":\"BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"ve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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-08T19:28:49+00:00",
      "cve": "CVE-2026-46294",
      "id": "CVE-2026-46294",
      "initial_release_date": "2026-06-08T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm: fix a buffer overflow in ioctl processing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46294.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:53:27Z",
      "cve": "CVE-2026-46294",
      "id": "CVE-2026-46294",
      "initial_release_date": "2026-06-09T02:20:54Z",
      "product_status:known_affected": "215",
      "product_status:known_not_affected": "23",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46294",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46294.json",
      "version": "6"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.