CVE-2026-46281 (GCVE-0-2026-46281)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:41 – Updated: 2026-06-14 18:06
VLAI
Title
vmalloc: fix buffer overflow in vrealloc_node_align()
Summary
In the Linux kernel, the following vulnerability has been resolved: vmalloc: fix buffer overflow in vrealloc_node_align() Commit 4c5d3365882d ("mm/vmalloc: allow to set node and align in vrealloc") added the ability to force a new allocation if the current pointer is on the wrong NUMA node, or if an alignment constraint is not met, even if the user is shrinking the allocation. On this path (need_realloc), the code allocates a new object of 'size' bytes and then memcpy()s 'old_size' bytes into it. If the request is to shrink the object (size < old_size), this results in an out-of-bounds write on the new buffer. Fix this by bounding the copy length by the new allocation size.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4c5d3365882dbbc0784688784904f440d7a4c0f1 , < e9b057a44deff4c59c13f44672a5cc74dcd57522 (git)
Affected: 4c5d3365882dbbc0784688784904f440d7a4c0f1 , < b281adf71f786c325eb6d6d1582d4d05313438a8 (git)
Affected: 4c5d3365882dbbc0784688784904f440d7a4c0f1 , < 82d1f01292d3f09bf063f829f8ab8de12b4280a1 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (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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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvmalloc: fix buffer overflow in vrealloc_node_align()\n\nCommit 4c5d3365882d (\"mm/vmalloc: allow to set node and align in\nvrealloc\") added the ability to force a new allocation if the current\npointer is on the wrong NUMA node, or if an alignment constraint is not\nmet, even if the user is shrinking the allocation.\n\nOn this path (need_realloc), the code allocates a new object of \u0027size\u0027\nbytes and then memcpy()s \u0027old_size\u0027 bytes into it.  If the request is to\nshrink the object (size \u003c old_size), this results in an out-of-bounds\nwrite on the new buffer.\n\nFix this by bounding the copy length by the new allocation size."
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    "dateReserved": "2026-05-13T15:03:33.110Z",
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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

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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.
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  • 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.