VulnerabilityPublished 19 Jul 2026Updated 21 Oct 2026

CVE-2026-64079: Linux kernel · netfilter: x_tables: allocate hook ops while under mutex

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f669571a2bf5067f50091cc598df9613663ee226 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f669571a2bf5067f50091cc598df9613663ee226, b62eb8dcf2c47d4d676a434efbd57c4f776f7829, 693bffd742dd4fa9a0076ed120545af3679c588b +2

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 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 ≥ ae689334225ff0e4ef112459ecd24aea932c2b00, < f669571a2bf5067f50091cc598df9613663ee226	Fixed in f669571a2bf5067f50091cc598df9613663ee226
LinuxLinux	Affected ≥ ae689334225ff0e4ef112459ecd24aea932c2b00, < b62eb8dcf2c47d4d676a434efbd57c4f776f7829	Fixed in b62eb8dcf2c47d4d676a434efbd57c4f776f7829
LinuxLinux	Affected ≥ ae689334225ff0e4ef112459ecd24aea932c2b00, < 693bffd742dd4fa9a0076ed120545af3679c588b	Fixed in 693bffd742dd4fa9a0076ed120545af3679c588b
LinuxLinux	Affected ≥ ae689334225ff0e4ef112459ecd24aea932c2b00, < 5ea15e78232253e657d352e625fb4913e2f57e63	Fixed in 5ea15e78232253e657d352e625fb4913e2f57e63
LinuxLinux	Affected ≥ ae689334225ff0e4ef112459ecd24aea932c2b00, < 2f92c5f923979f37ab1d5445381e4b8378a196cc	Fixed in 2f92c5f923979f37ab1d5445381e4b8378a196cc
LinuxLinux	Affected =5.13	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: allocate hook ops while under mutex arp/ip(6)t_register_table() add the table to the per-netns list via xt_register_table() before allocating the per-netns hook ops copy via kmemdup_array(). This leaves a window where the table is visible in the list with ops=NULL. If the pernet exit happens runs concurrently the pre_exit callback finds the table via xt_find_table() and passes the NULL ops pointer to nf_unregister_net_hooks(), causing a NULL dereference: general protection fault in nf_unregister_net_hooks+0xbc/0x150 RIP: nf_unregister_net_hooks (net/netfilter/core.c:613) Call Trace: ipt_unregister_table_pre_exit iptable_mangle_net_pre_exit ops_pre_exit_list cleanup_net Fix by moving the ops allocation into the xtables core so the table is never in the list without valid ops. Also ensure the table is no longer processing packets before its torn down on error unwind. nf_register_net_hooks might have published at least one hook; call synchronize_rcu() if there was an error. audit log register message gets deferred until all operations have passed, this avoids need to emit another ureg message in case of error unwinding. Based on earlier patch by Tristan Madani.

References

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