{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77"
            },
            {
              "fixed": "ddbbc8b2a09dd2cfed90871313e3691ae1db08a2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d"
            },
            {
              "fixed": "ffbce350c6fd1e99116ea57383b9031717e36d3b"
            },
            {
              "fixed": "98f3de6ef4efbd899348d333f0902dc4ff14380c"
            },
            {
              "fixed": "790304c02bf9bd7b8171feda4294d6e62d32ae8f"
            },
            {
              "fixed": "922d48fe8c19f388ffa2f709f33acaae4e408de2"
            },
            {
              "fixed": "30010c952077a1c89ecdd71fc4d574c75a8f5617"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "f2283680a80571ca82d710bc6ecd8f8beac67d63"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.71"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.145"
            },
            {
              "fixed": "5.16"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.136"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.6.0"
            },
            {
              "fixed": "6.12.84"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.18.25"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31705.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment\n\nsmb2_get_ea() applies 4-byte alignment padding via memset() after\nwriting each EA entry. The bounds check on buf_free_len is performed\nbefore the value memcpy, but the alignment memset fires unconditionally\nafterward with no check on remaining space.\n\nWhen the EA value exactly fills the remaining buffer (buf_free_len == 0\nafter value subtraction), the alignment memset writes 1-3 NUL bytes\npast the buf_free_len boundary. In compound requests where the response\nbuffer is shared across commands, the first command (e.g., READ) can\nconsume most of the buffer, leaving a tight remainder for the QUERY_INFO\nEA response. The alignment memset then overwrites past the physical\nkvmalloc allocation into adjacent kernel heap memory.\n\nAdd a bounds check before the alignment memset to ensure buf_free_len\ncan accommodate the padding bytes.\n\nThis is the same bug pattern fixed by commit beef2634f81f (\"ksmbd: fix\npotencial OOB in get_file_all_info() for compound requests\") and\ncommit fda9522ed6af (\"ksmbd: fix OOB write in QUERY_INFO for compound\nrequests\"), both of which added bounds checks before unconditional\nwrites in QUERY_INFO response handlers.",
  "id": "CVE-2026-31705",
  "modified": "2026-07-08T05:39:21.694599592Z",
  "published": "2026-05-01T13:56:03.896Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30010c952077a1c89ecdd71fc4d574c75a8f5617"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/790304c02bf9bd7b8171feda4294d6e62d32ae8f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/922d48fe8c19f388ffa2f709f33acaae4e408de2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98f3de6ef4efbd899348d333f0902dc4ff14380c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddbbc8b2a09dd2cfed90871313e3691ae1db08a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffbce350c6fd1e99116ea57383b9031717e36d3b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31705.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31705"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment"
}