CVE-2026-31705 (GCVE-0-2026-31705)

Vulnerability from cvelistv5 – Published: 2026-05-01 13:56 – Updated: 2026-06-14 17:43
VLAI
Title
ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment smb2_get_ea() applies 4-byte alignment padding via memset() after writing each EA entry. The bounds check on buf_free_len is performed before the value memcpy, but the alignment memset fires unconditionally afterward with no check on remaining space. When the EA value exactly fills the remaining buffer (buf_free_len == 0 after value subtraction), the alignment memset writes 1-3 NUL bytes past the buf_free_len boundary. In compound requests where the response buffer is shared across commands, the first command (e.g., READ) can consume most of the buffer, leaving a tight remainder for the QUERY_INFO EA response. The alignment memset then overwrites past the physical kvmalloc allocation into adjacent kernel heap memory. Add a bounds check before the alignment memset to ensure buf_free_len can accommodate the padding bytes. This is the same bug pattern fixed by commit beef2634f81f ("ksmbd: fix potencial OOB in get_file_all_info() for compound requests") and commit fda9522ed6af ("ksmbd: fix OOB write in QUERY_INFO for compound requests"), both of which added bounds checks before unconditional writes in QUERY_INFO response handlers.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 , < ddbbc8b2a09dd2cfed90871313e3691ae1db08a2 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < ffbce350c6fd1e99116ea57383b9031717e36d3b (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 98f3de6ef4efbd899348d333f0902dc4ff14380c (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 790304c02bf9bd7b8171feda4294d6e62d32ae8f (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 922d48fe8c19f388ffa2f709f33acaae4e408de2 (git)
Affected: e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d , < 30010c952077a1c89ecdd71fc4d574c75a8f5617 (git)
Affected: f2283680a80571ca82d710bc6ecd8f8beac67d63 (git)
Affected: 6.1.71 , < 6.1.175 (semver)
Affected: 5.15.145 , < 5.16 (semver)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.84 , ≤ 6.12.* (semver)
Unaffected: 6.18.25 , ≤ 6.18.* (semver)
Unaffected: 7.0.2 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "value": "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."
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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 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:27:40+00:00",
      "cve": "CVE-2026-31705",
      "id": "CVE-2026-31705",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31705.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-15T01:26:56Z",
      "cve": "CVE-2026-31705",
      "id": "CVE-2026-31705",
      "initial_release_date": "2026-05-02T01:25:26Z",
      "product_status:known_not_affected": "289",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31705",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31705.json",
      "version": "6"
    }
  }
}



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Sightings

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  • 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.