VulnerabilityPublished 25 Sep 2026Updated 21 Oct 2026

CVE-2026-98085: Linux kernel · bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in a0cd9e22f8faed30a8da8be357c51bd8b3074ee9 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in a0cd9e22f8faed30a8da8be357c51bd8b3074ee9, 671b7b9a660ef15b25faa3df161205b9dc8d1eb2, 387b1baefbb776e3f48dc2261e77a49213f470f7 +9

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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=6.6.148 <6.6.160 >=6.12.101 <6.12.114 >=6.18.42 <6.18.57 >=5.10.265 <5.11 >=5.15.216 <5.16 >=6.1.183 <6.2 >=7.0.10 <7.1	Fixed in a0cd9e22f8faed30a8da8be357c51bd8b3074ee9 671b7b9a660ef15b25faa3df161205b9dc8d1eb2 387b1baefbb776e3f48dc2261e77a49213f470f7 19cca7c36055906b3cff3e297618ee8a50cde25d 12c064bcfa56e3631be9f5336ee113b7f849959a 7.1 6.18.57 6.12.114 6.6.160 6.2 5.16 5.11
LinuxLinux	Affected =7.1	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge Nicholas Carlini reported a bug in precision backtracking mechanism for BPF_LD | BPF_{IND,ABS} instructions. These instructions are modelled as two branches: - fallthrough; - implicit exit from current subprogram. The implicit exit case was not handled by the backtrack_insn() function. When backtracking such a path backtrack_insn() did not call bt_subprog_enter(), which meant that backtracking continued manipulating precision marks in a caller frame, while looking at instructions in a callee frame. This lead to segmentation faults during verification (see the selftest), or unsound state pruning.

References

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