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CVE-2026-52955

libceph: Fix potential out-of-bounds access in crush_decode()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in crush_decode() A message of type CEPH_MSG_OSD_MAP containing a crush map with at least one bucket has two fields holding the bucket algorithm. If the values in these two fields differ, an out-of-bounds access can occur. This is the case because the first algorithm field (alg) is used to allocate the correct amount of memory for a bucket of this type, while the second algorithm field inside the bucket (b->alg) is used in the subsequent processing. This patch fixes the issue by adding a check that compares alg and b->alg and aborts the processing in case they differ. Furthermore, b->alg is set to 0 in this case, because the destruction of the crush map also uses this field to determine the bucket type, which can again result in an out-of-bounds access when trying to free the memory pointed to by the fields of the bucket. To correctly free the memory allocated for the bucket in such a case, the corresponding call to kfree is moved from the algorithm-specific crush_destroy_bucket functions to the generic crush_destroy_bucket().

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in 6e70ef53e818c53eab28d7b0026b7fd03dddaba5; From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in ebe76d58a48a48031b98543d86c4cd30a825b622; From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in 3f42508191e129ee6b5ea96578d5cab14f2a013a; From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in ea0d42137f0c06da71e37ffc647aab4c5309599a; From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5; From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in 0f3604cbe4df14c5e58288ac9f57511e726a222d; From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in fb176a99e4c1a5a8448a83d83d3606203ba81faa; From f24e9980eb860d8600cbe5ef3d2fd9295320d229 · fixed in 4c79fc2d598694bda845b46229c9d48b65042970

  • Linux Linux

    2.6.34

  • KernelLinux

    From 2.6.34 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.141; From 6.7.0 · fixed in 6.12.91; From 6.13.0 · fixed in 6.18.33; From 6.19.0 · fixed in 7.0.10

References 8

git.kernel.org