VulnerabilityPublished 18 Oct 2026

CVE-2026-98590: Linux kernel · bpf: Fix bpf_sock context code generation

Source GCVE Database

Authoritative record:CVE-2026-98590· Medium

Not known to be exploited · fixed in ea4dc96c902ccfa49dd3e4f23c443dab4a74b018 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Medium

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.
Patch: Available – fixed in ea4dc96c902ccfa49dd3e4f23c443dab4a74b018, e3ddcf4aeb342d4de2e5761c7042270d454752de, d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c +5

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 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.

ghsa-6ffg-3w9m-mjpv

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ c3c16f2ea6d20159903cf93afbb1155f3d8348d5, < ea4dc96c902ccfa49dd3e4f23c443dab4a74b018	Fixed in ea4dc96c902ccfa49dd3e4f23c443dab4a74b018
LinuxLinux	Affected ≥ c3c16f2ea6d20159903cf93afbb1155f3d8348d5, < e3ddcf4aeb342d4de2e5761c7042270d454752de	Fixed in e3ddcf4aeb342d4de2e5761c7042270d454752de
LinuxLinux	Affected ≥ c3c16f2ea6d20159903cf93afbb1155f3d8348d5, < d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c	Fixed in d95dd5a6c6cd08d5ae466d3aed27b3cf59155a6c
LinuxLinux	Affected ≥ c3c16f2ea6d20159903cf93afbb1155f3d8348d5, < b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73	Fixed in b3f37afc7fd7c52bc2114310aff1eb24c7cd4d73
LinuxLinux	Affected ≥ c3c16f2ea6d20159903cf93afbb1155f3d8348d5, < 70288599d1754e157df8326239316dbdf08ea33c	Fixed in 70288599d1754e157df8326239316dbdf08ea33c
LinuxLinux	Affected ≥ c3c16f2ea6d20159903cf93afbb1155f3d8348d5, < 84ebb991ae985149079ae9ab51b7e3ba25a9ff53	Fixed in 84ebb991ae985149079ae9ab51b7e3ba25a9ff53

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented to address this vulnerability by correcting the code generation to use 32-bit move instructions and properly report variable sizes. Users should update their Linux kernel to a version that includes this fix once it is released. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.

Description

A vulnerability in the Linux kernel's BPF (Berkeley Packet Filter) sock context code generation was fixed. The issue involved incorrect handling of the rx_queue_mapping field, where the code used 64-bit move instructions that could cause the register to hold values outside the verifier's assumptions. This discrepancy could lead to unexpected runtime values. The fix ensures the read value width matches the assumed size by using 32-bit move instructions and correctly reporting the destination variable size.

Impact

The vulnerability could cause the BPF program to operate on values outside the verifier's expected range, potentially leading to incorrect program behavior or logic errors within the kernel's BPF subsystem. No known exploits in the wild have been reported. The impact is limited to the kernel's BPF sock context code generation and does not indicate direct privilege escalation or denial of service from the provided data.

References

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