High severity7.5NVD Advisory· Published Aug 26, 2019· Updated Jun 17, 2026
CVE-2019-8460
CVE-2019-8460
Description
OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.
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Affected products
4- OpenBSD/kerneldescription
Patches
Vulnerability mechanics
References
5- github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906fnvdPatchThird Party Advisory
- ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.signvdExploitVendor Advisory
- research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/nvdExploitPatchPress/Media CoverageThird Party Advisory
- security.netapp.com/advisory/ntap-20190905-0001/nvdThird Party Advisory
- us-cert.cisa.gov/ics/advisories/icsa-19-253-03nvd
News mentions
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