Description
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().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f24e9980eb860d8600cbe5ef3d2fd9295320d229 to < 6e70ef53e818c53eab28d7b0026b7fd03dddaba5affectedf24e9980eb860d8600cbe5ef3d2fd9295320d229 to < ebe76d58a48a48031b98543d86c4cd30a825b622affectedf24e9980eb860d8600cbe5ef3d2fd9295320d229 to < 3f42508191e129ee6b5ea96578d5cab14f2a013aaffectedf24e9980eb860d8600cbe5ef3d2fd9295320d229 to < ea0d42137f0c06da71e37ffc647aab4c5309599aaffectedf24e9980eb860d8600cbe5ef3d2fd9295320d229 to < cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5affectedf24e9980eb860d8600cbe5ef3d2fd9295320d229 to < 0f3604cbe4df14c5e58288ac9f57511e726a222daffectedf24e9980eb860d8600cbe5ef3d2fd9295320d229 to < fb176a99e4c1a5a8448a83d83d3606203ba81faaaffectedf24e9980eb860d8600cbe5ef3d2fd9295320d229 to < 4c79fc2d598694bda845b46229c9d48b65042970affected
Linux Linux
Default version status: affected
2.6.34affected0 to < 2.6.34unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.141 to ≤ 6.6.*unaffected6.12.91 to ≤ 6.12.*unaffected6.18.33 to ≤ 6.18.*unaffected7.0.10 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5 ↗
- https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622 ↗
- https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a ↗
- https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a ↗
- https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5 ↗
- https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d ↗
- https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa ↗
- https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970 ↗
- https://access.redhat.com/security/cve/CVE-2026-52955 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2492328 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json ↗