libceph: Fix potential out-of-bounds access in crush_decode()
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().
CVE-2026-52955
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-52955
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "6e70ef53e818c53eab28d7b0026b7fd03dddaba5",
"versionType": "git"
},
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "ebe76d58a48a48031b98543d86c4cd30a825b622",
"versionType": "git"
},
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "3f42508191e129ee6b5ea96578d5cab14f2a013a",
"versionType": "git"
},
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "ea0d42137f0c06da71e37ffc647aab4c5309599a",
"versionType": "git"
},
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5",
"versionType": "git"
},
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "0f3604cbe4df14c5e58288ac9f57511e726a222d",
"versionType": "git"
},
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "fb176a99e4c1a5a8448a83d83d3606203ba81faa",
"versionType": "git"
},
{
"status": "affected",
"version": "f24e9980eb860d8600cbe5ef3d2fd9295320d229",
"lessThan": "4c79fc2d598694bda845b46229c9d48b65042970",
"versionType": "git"
}
],
"programFiles": [
"net/ceph/crush/crush.c",
"net/ceph/osdmap.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.34",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.141",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.91",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.33",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ceph/crush/crush.c",
"net/ceph/osdmap.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-52955
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #40712 · Revision 1
- Added to Heist Feed
- Publisher date