VulnerabilityPublished 15 Aug 2026Updated 21 Oct 2026

CVE-2026-74559: Linux kernel · xsk: drain continuation descs after overflow in xsk_build_skb()

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in ecd0d1cde0478c232a867f14ec99cf97aff5eb30 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ecd0d1cde0478c232a867f14ec99cf97aff5eb30, ceb00cb87a22c42d20c39336213db2b843ca9e34, bd44a6dcd4248883de90f5dad53ae80066e27096 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 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 ecd0d1cde0478c232a867f14ec99cf97aff5eb30, ceb00cb87a22c42d20c39336213db2b843ca9e34, bd44a6dcd4248883de90f5dad53ae80066e27096 or 5e94d74e4f3baebaa083288f33b4be7ce0a34982.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cf24f5a5feeaae34c1a34d1e04f8ac697290427a, < ecd0d1cde0478c232a867f14ec99cf97aff5eb30	Fixed in ecd0d1cde0478c232a867f14ec99cf97aff5eb30
LinuxLinux	Affected ≥ cf24f5a5feeaae34c1a34d1e04f8ac697290427a, < ceb00cb87a22c42d20c39336213db2b843ca9e34	Fixed in ceb00cb87a22c42d20c39336213db2b843ca9e34
LinuxLinux	Affected ≥ cf24f5a5feeaae34c1a34d1e04f8ac697290427a, < bd44a6dcd4248883de90f5dad53ae80066e27096	Fixed in bd44a6dcd4248883de90f5dad53ae80066e27096
LinuxLinux	Affected ≥ cf24f5a5feeaae34c1a34d1e04f8ac697290427a, < 5e94d74e4f3baebaa083288f33b4be7ce0a34982	Fixed in 5e94d74e4f3baebaa083288f33b4be7ce0a34982
LinuxLinux	Affected =6.6	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: xsk: drain continuation descs after overflow in xsk_build_skb() Fix generic xmit path multi-buffer logic when packets are either too big (count of descriptors exceed MAX_SKB_FRAGS) or an invalid descriptor is included in fragmented packet. Introduce xdp_sock::drain_cont and act upon this flag - when it is set, keep on consuming descriptors from AF_XDP Tx ring and put them directly onto Cq. Previously these descriptors were silently lost and could never be reached again.

References

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