VulnerabilityPublished 25 Sep 2026Updated 19 Oct 2026

CVE-2026-98045: Linux kernel · bpf: Mark faultable stack helpers as sleepable

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 3014e8a8bdad55075d89836ad9c10710a9a69837 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:30 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3014e8a8bdad55075d89836ad9c10710a9a69837, 44b8d370f2725bad215da3e67668e98ba96671bd, 19e8d5a98afd071d8c1c5adeccf92b3c42eddc70 +1

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 Linux kernel to 3014e8a8bdad55075d89836ad9c10710a9a69837, 44b8d370f2725bad215da3e67668e98ba96671bd, 19e8d5a98afd071d8c1c5adeccf92b3c42eddc70 or 9d02927fdf4e930893c92e35fed01a2704496900.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d4dd9775ec242425576af93daadb80a34083a53c, < 3014e8a8bdad55075d89836ad9c10710a9a69837	Fixed in 3014e8a8bdad55075d89836ad9c10710a9a69837
LinuxLinux	Affected ≥ d4dd9775ec242425576af93daadb80a34083a53c, < 44b8d370f2725bad215da3e67668e98ba96671bd	Fixed in 44b8d370f2725bad215da3e67668e98ba96671bd
LinuxLinux	Affected ≥ d4dd9775ec242425576af93daadb80a34083a53c, < 19e8d5a98afd071d8c1c5adeccf92b3c42eddc70	Fixed in 19e8d5a98afd071d8c1c5adeccf92b3c42eddc70
LinuxLinux	Affected ≥ d4dd9775ec242425576af93daadb80a34083a53c, < 9d02927fdf4e930893c92e35fed01a2704496900	Fixed in 9d02927fdf4e930893c92e35fed01a2704496900
LinuxLinux	Affected =6.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark faultable stack helpers as sleepable The faultable variants of bpf_get_stack() and bpf_get_task_stack() pass may_fault=true into the common stack collection code. Resolving user-space build IDs may then call build_id_parse_file() and block on filesystem reads. Neither helper prototype sets might_sleep. Since prototype selection uses the sleepability of the whole program, the verifier can still allow these helpers from a non-sleepable region within that program, such as an explicit RCU or preemption-disabled region. The task-stack helper can also be called from a non-sleepable timer callback of a sleepable program. Mark both faultable prototypes as sleepable. The existing helper context check then rejects these calls while continuing to allow them in genuinely sleepable contexts.

References

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