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Vulnerability record · CVE-2026-52955 · published 24 June 2026

CVE-2026-52955: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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().

9.8 CVSS 3.1 Critical EPSS 0.51% · top 59.0% CWE-125 · Out-of-bounds readCWE-131 · CWE-131
9.8CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
11References
15 Jul 2026Last modified by NVD

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().

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d Patch
https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a Patch
https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970 Patch
https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5 Patch
https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5 Patch
https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a Patch
https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622 Patch
https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa Patch
https://access.redhat.com/security/cve/CVE-2026-52955 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2492328 Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-52955), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.