CVE-2026-43405

HIGH EPSS 38.4%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: Use u32 for non-negative values in ceph_monmap_decode() This patch fixes unnecessary implicit conversions that change signedness of blob_len and num_mon in ceph_monmap_decode(). Currently blob_len and num_mon are (signed) int variables. They are used to hold values that are always non-negative and get assigned in ceph_decode_32_safe(), which is meant to assign u32 values. Both variables are subsequently used as unsigned values, and the value of num_mon is further assigned to monmap->num_mon, which is of type u32. Therefore, both variables should be of type u32. This is especially relevant for num_mon. If the value read from the incoming message is very large, it is interpreted as a negative value, and the check for num_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to allocate a very large chunk of memory for monmap, which will most likely fail. In this case, an unnecessary attempt to allocate memory is performed, and -ENOMEM is returned instead of -EINVAL.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
38.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-908

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.167
linuxlinux_kernel*≥6.2  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140
    Patch