CVE-2026-98794ipvs: filter some flags received in the backup server
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: ipvs: filter some flags received in the backup server While the IPVS SYNC protocol is not secure by design we can still protect the backup server from messages that can wreak havoc. This commit addresses problems from received connection flags or their combinations. We now drop messages as follows: 1. the NO_CPORT+TEMPLATE combination allows lookups for normal connections to hit template which can break in many ways. While the master does not sync connections with NO_CPORT flag, i.e. before they are established, we still accept NO_CPORT without TEMPLATE. 2. ONE_PACKET: it is not sent by master, so we do not expect it in backup. Before now it was ignored by IP_VS_CONN_F_BACKUP_MASK for protocol v1 while protocol v0 created connections that are not hashed and dropped immediately. Better to apply the IP_VS_CONN_F_BACKUP_MASK also to the flags from v0 messages for consistency with v1.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 before f4cd1db7d421e82945713a36084bb0c35b75b27e; 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 builds before 55d033324f67a15ff56be6d38d6e87f644e0ed62; 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 builds before 45a93111835ccfea7d969ec73588e33745fd9834; from 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6 before f96e91748f6304668fe647e686d199d7207d36f1 | CNA record |
References
- https://git.kernel.org/stable/c/f4cd1db7d421e82945713a36084bb0c35b75b27e
- https://git.kernel.org/stable/c/55d033324f67a15ff56be6d38d6e87f644e0ed62
- https://git.kernel.org/stable/c/45a93111835ccfea7d969ec73588e33745fd9834
- https://git.kernel.org/stable/c/f96e91748f6304668fe647e686d199d7207d36f1
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.