{"id":"CVE-2026-52955","summary":"libceph: Fix potential out-of-bounds access in crush_decode()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Fix potential out-of-bounds access in crush_decode()\n\nA message of type CEPH_MSG_OSD_MAP containing a crush map with at least\none bucket has two fields holding the bucket algorithm. If the values\nin these two fields differ, an out-of-bounds access can occur. This is\nthe case because the first algorithm field (alg) is used to allocate\nthe correct amount of memory for a bucket of this type, while the second\nalgorithm field inside the bucket (b-\u003ealg) is used in the subsequent\nprocessing.\n\nThis patch fixes the issue by adding a check that compares alg and\nb-\u003ealg and aborts the processing in case they differ. Furthermore,\nb-\u003ealg is set to 0 in this case, because the destruction of the crush\nmap also uses this field to determine the bucket type, which can again\nresult in an out-of-bounds access when trying to free the memory pointed\nto by the fields of the bucket. To correctly free the memory allocated\nfor the bucket in such a case, the corresponding call to kfree is moved\nfrom the algorithm-specific crush_destroy_bucket functions to the\ngeneric crush_destroy_bucket().","modified":"2026-07-14T09:29:33.314601874Z","published":"2026-06-24T16:28:37.748Z","related":["SUSE-SU-2026:2840-1","SUSE-SU-2026:2841-1","SUSE-SU-2026:2914-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52955.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-52955"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52955.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52955"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2492328"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f24e9980eb860d8600cbe5ef3d2fd9295320d229"},{"fixed":"6e70ef53e818c53eab28d7b0026b7fd03dddaba5"},{"fixed":"ebe76d58a48a48031b98543d86c4cd30a825b622"},{"fixed":"3f42508191e129ee6b5ea96578d5cab14f2a013a"},{"fixed":"ea0d42137f0c06da71e37ffc647aab4c5309599a"},{"fixed":"cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5"},{"fixed":"0f3604cbe4df14c5e58288ac9f57511e726a222d"},{"fixed":"fb176a99e4c1a5a8448a83d83d3606203ba81faa"},{"fixed":"4c79fc2d598694bda845b46229c9d48b65042970"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52955.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.34"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.141"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52955.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}