CVE-2026-98077: Linux kernel · netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace() sip_skip_whitespace() returns dptr unchanged when its own loop exhausts the buffer (dptr == limit), instead of NULL like its sibling sip_follow_continuation() returns on its own "no more data" path. ct_sip_get_header() only checks for NULL after calling it: dptr = sip_skip_whitespace(dptr, limit); if (dptr == NULL) break; if (*dptr != ':' || ++dptr >= limit) break; so a recognized header name followed only by spaces/tabs running to the exact end of the SIP payload, with no colon, makes the very next statement read one byte past the buffer. Make both "no more data" outcomes return NULL, matching the convention sip_follow_continuation() already uses and that both existing callers already check for.
References
- ubuntu.com/security/CVE-2026-98077 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98077 (opens in a new tab)
- git.kernel.org/stable/c/60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94 (opens in a new tab)
- git.kernel.org/stable/c/4a30aa2ba007db18210dd52219ecbd5528c03523 (opens in a new tab)
- git.kernel.org/stable/c/4be8380e3af008f418f97992c06f23be649a430d (opens in a new tab)
- git.kernel.org/stable/c/e8f8231824b5815f57ce62cba116e511b10196de (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-98077 (opens in a new tab)
- git.kernel.org/stable/c/0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79 (opens in a new tab)
- git.kernel.org/stable/c/9ae0a87e6f513293677fe286729fbae34d592215 (opens in a new tab)
- git.kernel.org/stable/c/b6277622b7323000895b674321c9a1f060553188 (opens in a new tab)
- git.kernel.org/stable/c/c6beb08b1a9fdb96795816d8329ed75dd785d48e (opens in a new tab)