libceph: Use u32 for non-negative values in ceph_monmap_decode()
In the Linux kernel, the following vulnerability has been resolved: libceph: Use u32 for non-negative values in ceph_monmap_decode() This patch fixes unnecessary implicit conversions that change signedness of blob_len and num_mon in ceph_monmap_decode(). Currently blob_len and num_mon are (signed) int variables. They are used to hold values that are always non-negative and get assigned in ceph_decode_32_safe(), which is meant to assign u32 values. Both variables are subsequently used as unsigned values, and the value of num_mon is further assigned to monmap->num_mon, which is of type u32. Therefore, both variables should be of type u32. This is especially relevant for num_mon. If the value read from the incoming message is very large, it is interpreted as a negative value, and the check for num_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to allocate a very large chunk of memory for monmap, which will most likely fail. In this case, an unnecessary attempt to allocate memory is performed, and -ENOMEM is returned instead of -EINVAL.
CVE-2026-43405
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-2026-43405
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": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
"lessThan": "ee5588e2bc41acb73f6676c0520420c107cd0140",
"versionType": "git"
},
{
"status": "affected",
"version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
"lessThan": "86f7060cd638d6eb042e8ed780fb83a59ca0dcb3",
"versionType": "git"
},
{
"status": "affected",
"version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
"lessThan": "5f2806684b05bd24d05c091083b8e2517ba8ffac",
"versionType": "git"
},
{
"status": "affected",
"version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
"lessThan": "b268984ae88cb0dcd7a8e8263962c748448e26e8",
"versionType": "git"
},
{
"status": "affected",
"version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
"lessThan": "ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace",
"versionType": "git"
},
{
"status": "affected",
"version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
"lessThan": "08bc6173fd611ad5a40f472bf5f15b92aea0fe40",
"versionType": "git"
},
{
"status": "affected",
"version": "a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c",
"lessThan": "770444611f047dbfd4517ec0bc1b179d40c2f346",
"versionType": "git"
}
],
"programFiles": [
"net/ceph/mon_client.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ceph/mon_client.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43405
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40072 · Revision 1
- Added to Heist Feed
- Publisher date