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CVE-2026-98794

UnknownEPSS 0.20%

Last modified

CVE-2026-98794 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.20%

9.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < ef3cd6c0b826e50dc21653b32552e258de6fd51c; >= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < 3a9f5459db60311643bfbadf019f6d5370f2f26a; >= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < 438a5335276614186d6a96b8e7bddce811ad4ad6; >= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < d7d33c9efa9d1a2f244a1a64ec9b540b0f8975a0; >= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < f4cd1db7d421e82945713a36084bb0c35b75b27e; >= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < 55d033324f67a15ff56be6d38d6e87f644e0ed62; >= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < 45a93111835ccfea7d969ec73588e33745fd9834; >= 87375ab47cd0ba04124c6d3fd80db5c368f5dcb6, < f96e91748f6304668fe647e686d199d7207d36f1
LinuxLinux2.6.14

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98794?
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.
How severe is CVE-2026-98794?
Severity scoring for CVE-2026-98794 is pending analysis. The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98794?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST