VulnerabilityPublished 18 Oct 2026

CVE-2026-98588: Linux kernel · bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc

Source GCVE Database

Authoritative record:CVE-2026-98588· High

Not known to be exploited · fixed in f4a73f49e256bd835368504462be3b57b03febff : patch Linux kernel soon.

Data as of 26 Oct 2026, 13:47 UTC

Severity

High

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 f4a73f49e256bd835368504462be3b57b03febff, cea597519b9ca6d691c98d92460ead8ece2a07af, cc70972ddbf0e3398f2f32624d31db78594d50d8 +4

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-v3gv-6qr6-4mh5

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1, < f4a73f49e256bd835368504462be3b57b03febff	Fixed in f4a73f49e256bd835368504462be3b57b03febff
LinuxLinux	Affected ≥ 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1, < cea597519b9ca6d691c98d92460ead8ece2a07af	Fixed in cea597519b9ca6d691c98d92460ead8ece2a07af
LinuxLinux	Affected ≥ 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1, < cc70972ddbf0e3398f2f32624d31db78594d50d8	Fixed in cc70972ddbf0e3398f2f32624d31db78594d50d8
LinuxLinux	Affected ≥ 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1, < c56191af3a578b9cc265fa3bd5fc0752c59c1781	Fixed in c56191af3a578b9cc265fa3bd5fc0752c59c1781
LinuxLinux	Affected ≥ 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1, < ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8	Fixed in ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8
LinuxLinux	Affected ≥ 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1, < 909f761868fda329dc69130ef9eb5b5795bcdf00	Fixed in 909f761868fda329dc69130ef9eb5b5795bcdf00

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

AI-suggested

A fix is available that rejects max_entries values greater than INT_MAX during sockmap creation, preventing the signed integer overflow in sock_map_free(). Users should update to a kernel version that includes this fix. No additional mitigation is required beyond applying the official fix.

Description

A vulnerability in the Linux kernel's BPF sockmap implementation allowed creation of sockmaps with max_entries greater than INT_MAX, leading to a signed integer overflow during map freeing. This caused out-of-bounds memory access and potential memory corruption or kernel crashes. The issue was triggered by setting max_entries to UINT_MAX (0xffffffff).

References

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