CVE-2026-80586
CVE-2026-80586: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh8.3
High [CVE-2026-80586] reset DSS fields in case of unexpected size
CVE-2026-80586Source published Source updated
In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data. A flaw was found in the Linux kernel's Multipath TCP (mptcp) implementation. This could lead to data inconsistency or the access of uninitialized data, potentially resulting in information disclosure or a denial of service. Red Hat severity: Important — CVSS 8.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H). Weakness: CWE-824. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat…
- Affected products in this advisory
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat package: kernel-rt
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- The vulnerability affects the Multipath TCP (MPTCP) feature in the Linux kernel. To mitigate this issue, MPTCP can be disabled by preventing the `mptcp` kernel module from loading. To disable the `mptcp` module: 1. Create a new file `/etc/modprobe.d/disable-mptcp.conf` with the following content: `install mptcp /bin/true blacklist mptcp` 2. Regenerate the initramfs to ensure the change takes effect on boot: `sudo dracut -f -v` 3. Reboot the system for the changes to take effect. Disabling MPTCP may impact network performance or functionality for applications that rely on Multipath TCP.
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