GHSA-gh29-fq9g-3p7h · Severity: unknown — In the Linux kernel, the following vulnerability has been resolved: mptcp: do not account for...
In the Linux kernel, the following vulnerability has been resolved: mptcp: do not account for OoO in mptcp_rcvbuf_grow() MPTCP-level OoOs are physiological when multiple subflows are active concurrently and will not cause retransmissions nor are caused by drops. Accounting for them in mptcp_rcvbuf_grow() causes the rcvbuf slowly drifting towards tcp_rmem[2]. Remove such accounting. Note that subflows will still account for TCP-level OoO when the MPTCP-level rcvbuf is propagated. This also closes a subtle and very unlikely race condition with rcvspace init; active sockets with user-space holding the msk-level socket lock, could complete such initialization in the receive callback, after that the first OoO data reaches the rcvbuf and potentially triggering a divide by zero Oops.
Conclusion & alert: CVE-2026-45889 is rated Low Risk (9.8/100): low exploitation likelihood (EPSS 0.20%). Mandatory action: Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.02% | 0.20% | +0.18% |
| 2 | 2026-05-28 | — | 0.02% | — |
Full EPSS history (2 records total)
CVSS metrics for this CVE.
No CVSS data in dataset for this CVE.
GHSA-gh29-fq9g-3p7h · Severity: unknown — In the Linux kernel, the following vulnerability has been resolved: mptcp: do not account for...
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2026-45889 unimportant priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2026-45889 |
redhat
|
— | — | https://access.redhat.com/security/cve/CVE-2026-45889 |
suse
|
— | — | https://www.suse.com/security/cve/CVE-2026-45889/ |
ubuntu
|
medium | CVE-2026-45889 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1422 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1024, ignored 169, not-affected 144, released 84, needs-triage 1. | https://ubuntu.com/security/CVE-2026-45889 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| linux | linux_kernel | >= 6.18, < 6.18.14 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.18, < 6.19.4 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| linux | linux_kernel | >= 6.18, < 7.0 | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |