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CVE-2026-43405

libceph: Use u32 for non-negative values in ceph_monmap_decode()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c · fixed in ee5588e2bc41acb73f6676c0520420c107cd0140; From a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c · fixed in 86f7060cd638d6eb042e8ed780fb83a59ca0dcb3; From a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c · fixed in 5f2806684b05bd24d05c091083b8e2517ba8ffac; From a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c · fixed in b268984ae88cb0dcd7a8e8263962c748448e26e8; From a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c · fixed in ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace; From a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c · fixed in 08bc6173fd611ad5a40f472bf5f15b92aea0fe40; From a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c · fixed in 770444611f047dbfd4517ec0bc1b179d40c2f346

  • Linux Linux

    5.11

  • KernelLinux

    From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.19; From 6.19.0 · fixed in 6.19.9

References 7

git.kernel.org