Answer in brief
CVE-2026-98525 records a Unknown severity vulnerability in mctp: route: iterate socket tag list in mctp_lookup_prealloc_tag(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=63ed1aab3d40aa61aaa66819bdce9377ac7f40fa <09299addab11857e92eca55cd8ef3350b927c90c || >=63ed1aab3d40aa61aaa66819bdce9377ac7f40fa <e35cb500dd14882f8dee61783fccd1823fd3ab0d || >=63ed1aab3d40aa61aaa66819bdce9377ac7f40fa <f178300e2f56ca9ec2a3a0090608730bbee0af7b || >=63ed1aab3d40aa61aaa66819bdce9377ac7f40fa <26cc0e69cce062cd3aa6fae33074684669c35a71 | 09299addab11857e92eca55cd8ef3350b927c90c, e35cb500dd14882f8dee61783fccd1823fd3ab0d, f178300e2f56ca9ec2a3a0090608730bbee0af7b, 26cc0e69cce062cd3aa6fae33074684669c35a71 |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
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).
Quoted source text, attributed separately from HOL analysis.