CVE-2026-46094 (GCVE-0-2026-46094)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:58 – Updated: 2026-06-14 17:53
VLAI
Title
ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access The bounds check for the next xattr entry in check_xattrs() uses (void *)next >= end, which allows next to point within sizeof(u32) bytes of end. On the next loop iteration, IS_LAST_ENTRY() reads 4 bytes via *(__u32 *)(entry), which can overrun the valid xattr region. For example, if next lands at end - 1, the check passes since next < end, but IS_LAST_ENTRY() reads 4 bytes starting at end - 1, accessing 3 bytes beyond the valid region. Fix this by changing the check to (void *)next + sizeof(u32) > end, ensuring there is always enough space for the IS_LAST_ENTRY() read on the subsequent iteration.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < ab6da97bc310db35d4e4ef5354bc3ff626b0698c (git)
Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < 5a5314d2387633a272a04d1bd8727f99058e4e68 (git)
Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < 537e065977022aa22f2c2503e8accaf16622e0fd (git)
Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < 520986722dbf869c122252123fc161c7302eab7d (git)
Affected: 3478c83cf26bbffd026ae6a56bcb1fe544f0834e , < eceafc31ea7b42c984ece10d79d505c0bb6615d5 (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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    "dateReserved": "2026-05-13T15:03:33.097Z",
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    "redhat_vex": {
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      "current_release_date": "2026-06-27T09:49:55+00:00",
      "cve": "CVE-2026-46094",
      "id": "CVE-2026-46094",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: fix bounds check in check_xattrs() to prevent out-of-bounds access",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46094.json",
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}



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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.