nvme-multipath: fix flex array size in struct nvme_ns_head
In the Linux kernel, the following vulnerability has been resolved: nvme-multipath: fix flex array size in struct nvme_ns_head struct nvme_ns_head contains a flexible array member, current_path[], which is indexed using the NUMA node ID: head->current_path[numa_node_id()] The structure is currently allocated as: size = sizeof(struct nvme_ns_head) + (num_possible_nodes() * sizeof(struct nvme_ns *)); head = kzalloc(size, GFP_KERNEL); This allocation assumes that NUMA node IDs are sequential and densely packed from 0 .. num_possible_nodes() - 1. While this assumption holds on many systems, it is not always true on some architectures such as powerpc. On some powerpc systems, NUMA node IDs can be sparse. For example: NUMA: NUMA node(s): 6 NUMA node0 CPU(s): 80-159 NUMA node8 CPU(s): 0-79 NUMA node252 CPU(s): NUMA node253 CPU(s): NUMA node254 CPU(s): NUMA node255 CPU(s): That is, the possible/online NUMA node IDs are: 0, 8, 252, 253, 254, 255 In this case: num_possible_nodes() = 6 So memory is allocated for only 6 entries in current_path[]. However, the array is later indexed using the actual NUMA node ID. As a result, accesses such as: head->current_path[8] or head->current_path[252] goes out of bounds, leading to the following KASAN splat: ================================================================== BUG: KASAN: slab-out-of-bounds in nvme_mpath_revalidate_paths+0x22c/0x290 [nvme_core] Write of size 8 at addr c00020003bda35b8 by task kworker/u641:2/1997 CPU: 1 UID: 0 PID: 199
CVE-2026-74384
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-2026-74384
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": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "7e7b167e65610dfa7564d449474f4b477f9d4c1c",
"versionType": "git"
},
{
"status": "affected",
"version": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "316b5f1168264844aa125959de1d6da2b1905795",
"versionType": "git"
},
{
"status": "affected",
"version": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "1d4131b5c9823c7d2c86389898ad1b466af7df5e",
"versionType": "git"
},
{
"status": "affected",
"version": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "9ffdd11bd6c961b46b3689850ff6c5d7af5c5fe5",
"versionType": "git"
},
{
"status": "affected",
"version": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "bde4d6eb53f7d3cdae7e62c9ee84345fdd6e70a6",
"versionType": "git"
},
{
"status": "affected",
"version": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "140d6fff4ed266592492a23444043842b4af7a62",
"versionType": "git"
},
{
"status": "affected",
"version": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "7173a741fed73de6247384056fe92e582ba12507",
"versionType": "git"
},
{
"status": "affected",
"version": "f333444708f82c4a4d3ccac004da0bfd9cfdfa42",
"lessThan": "001e57554de81aa79c25c18fd53911d8a415c304",
"versionType": "git"
}
],
"programFiles": [
"drivers/nvme/host/core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.20"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/nvme/host/core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74384
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33117 · Revision 1
- Added to Heist Feed
- Publisher date