mctp: route: iterate socket tag list in mctp_lookup_prealloc_tag()
In the Linux kernel, the following vulnerability has been resolved: mctp: route: iterate socket tag list in mctp_lookup_prealloc_tag() When a socket transmits a packet with MCTP_TAG_PREALLOC set, mctp_lookup_prealloc_tag() iterates over the per-netns &mns->keys list and matches netid, req_tag, peer_addr, and manual_alloc, without checking whether tmp->sk == &msk->sk. This allows any MCTP socket in the same network namespace to use and consume another socket's preallocated tag. Iterate the socket's own tag list (&msk->keys via sklist) instead of the namespace-wide &mns->keys list in mctp_lookup_prealloc_tag(), ensuring that only tags allocated by msk are matched. Tested in QEMU against Linux 7.3.0-rc3 by allocating a manual tag (0x18) on socket A via SIOCMCTPALLOCTAG for peer EID 9 and sending a 4-byte message with MCTP_TAG_PREALLOC from socket B in the same network namespace. On the unfixed kernel, sendto(sock_b) using socket A's preallocated tag succeeds (ret = 4); with this patch applied, sendto(sock_b) fails with -ENOENT (errno = 2) while sendto(sock_a) succeeds (ret = 4).
CVE-2026-98525
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-2026-98525
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": "63ed1aab3d40aa61aaa66819bdce9377ac7f40fa",
"lessThan": "09299addab11857e92eca55cd8ef3350b927c90c",
"versionType": "git"
},
{
"status": "affected",
"version": "63ed1aab3d40aa61aaa66819bdce9377ac7f40fa",
"lessThan": "e35cb500dd14882f8dee61783fccd1823fd3ab0d",
"versionType": "git"
},
{
"status": "affected",
"version": "63ed1aab3d40aa61aaa66819bdce9377ac7f40fa",
"lessThan": "f178300e2f56ca9ec2a3a0090608730bbee0af7b",
"versionType": "git"
},
{
"status": "affected",
"version": "63ed1aab3d40aa61aaa66819bdce9377ac7f40fa",
"lessThan": "26cc0e69cce062cd3aa6fae33074684669c35a71",
"versionType": "git"
}
],
"programFiles": [
"net/mctp/route.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/mctp/route.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98525
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38550 · Revision 1
- Added to Heist Feed
- Publisher date