{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52955", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.373Z", "datePublished": "2026-06-24T16:28:37.748Z", "dateUpdated": "2026-10-19T19:47:09.949Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:05.254Z" }, "descriptions": [ { "lang": "en", "value": "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->alg) is used in the subsequent\nprocessing.\n\nThis patch fixes the issue by adding a check that compares alg and\nb->alg and aborts the processing in case they differ. Furthermore,\nb->alg 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()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable CRUSH map is parsed from CEPH_MSG_OSD_MAP messages delivered over Ceph messenger network sessions from monitor or OSD peers.\nAC:L - An attacker controlling a malicious or compromised Ceph peer can choose the two bucket algorithm fields and map contents directly; no race or external timing condition is required.\nPR:N - The attacker needs no privileges on the vulnerable kernel client; the higher-severity reasonable scenario is a malicious or compromised remote Ceph monitor/OSD sending the map.\nUI:N - Once the Ceph client is mounted or an RBD client is connected, OSD map updates are processed automatically without per-attack user action.\nS:U - The corruption occurs in the client kernel and impacts that same kernel security authority, with no VM, IOMMU, or other scope boundary crossed.\nC:H - The mismatch can make the parser/destructor interpret a smaller allocation as a larger bucket type, causing kernel heap out-of-bounds pointer accesses; such memory corruption is reasonably exploitable for information disclosure.\nI:H - The bug can write pointer fields beyond the allocated bucket object and later free through the wrong layout, creating kernel heap corruption with potential control-flow or data integrity compromise.\nA:H - Malformed OSD maps can corrupt kernel memory or trigger invalid frees/oopses, making a kernel crash or denial of service a high-probability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/crush/crush.c", "net/ceph/osdmap.c" ], "versions": [ { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "6e70ef53e818c53eab28d7b0026b7fd03dddaba5", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "ebe76d58a48a48031b98543d86c4cd30a825b622", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "3f42508191e129ee6b5ea96578d5cab14f2a013a", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "ea0d42137f0c06da71e37ffc647aab4c5309599a", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "0f3604cbe4df14c5e58288ac9f57511e726a222d", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "fb176a99e4c1a5a8448a83d83d3606203ba81faa", "status": "affected", "versionType": "git" }, { "version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229", "lessThan": "4c79fc2d598694bda845b46229c9d48b65042970", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/crush/crush.c", "net/ceph/osdmap.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", 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A remote attacker could send a specially crafted `CEPH_MSG_OSD_MAP` message where two internal fields, `alg` and `b->alg`, contain differing bucket algorithm values. This discrepancy can lead to an out-of-bounds memory access during processing or memory deallocation, potentially causing a system crash and resulting in a Denial of Service (DoS)." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Moderate" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-131", "description": "Incorrect Calculation of Buffer Size", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-52955" }, { "name": "RHBZ#2492328", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492328" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52955.json" } ], "timeline": [ { "lang": "en", "time": "2026-06-24T00:00:00.000Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-06-24T00:00:00.000Z", "value": "Made public." } ], "title": "kernel: libceph: Fix potential out-of-bounds access in crush_decode()", "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T00:45:47.779Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-52955", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:23:26.547216Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-131", "description": "CWE-131 Incorrect Calculation of Buffer Size" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:47:09.949Z" } } ] } }