VulnerabilityPublished 28 Oct 2026

CVE-2026-99116: Linux kernel · net: psp: do not inherit the Rx association on clone

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c962695467d3ab9738a6508279827ec33a7d2bdf : update Linux kernel when convenient.

Data as of 28 Oct 2026, 10:58 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Patch: Available – fixed in c962695467d3ab9738a6508279827ec33a7d2bdf, a9f14ea73e82db743f0acf4219f499d594589288, 1d2929d0850fff683b8aff051275945e65f082c8

Exploitation evidence

Disclosed: evidence found.
CVE published 28 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.

What to do

Upgrade Linux kernel to c962695467d3ab9738a6508279827ec33a7d2bdf, a9f14ea73e82db743f0acf4219f499d594589288 or 1d2929d0850fff683b8aff051275945e65f082c8.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6b46ca260e2290e3453d1355ab5b6d283d73d780, < c962695467d3ab9738a6508279827ec33a7d2bdf	Fixed in c962695467d3ab9738a6508279827ec33a7d2bdf
LinuxLinux	Affected ≥ 6b46ca260e2290e3453d1355ab5b6d283d73d780, < a9f14ea73e82db743f0acf4219f499d594589288	Fixed in a9f14ea73e82db743f0acf4219f499d594589288
LinuxLinux	Affected ≥ 6b46ca260e2290e3453d1355ab5b6d283d73d780, < 1d2929d0850fff683b8aff051275945e65f082c8	Fixed in 1d2929d0850fff683b8aff051275945e65f082c8
LinuxLinux	Affected =6.18	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: net: psp: do not inherit the Rx association on clone sk->psp_assoc sits past sk_dontcopy_end, so sock_copy() copies it into every socket accepted from a listener without taking a reference, while inet_sock_destruct() puts for every inet socket. psp_twsk_init() does refcount_inc() for the timewait socket, so a child closing through TIME_WAIT cancels its own put and leaves the association with one reference and N timewait sockets holding the same pointer. Closing the listener frees it, and the timewait timers then put freed memory. Rejecting the association on a listening socket is not sufficient: a socket can acquire one while established and then be turned back into a listener, because tcp_disconnect() leaves sk->psp_assoc in place. BUG: KASAN: slab-use-after-free in psp_twsk_assoc_free+0x6f/0xf0 Write of size 4 at addr ffff888110f9255c by task swapper/7/0 psp_twsk_assoc_free+0x6f/0xf0 inet_twsk_put+0xda/0x1b0 call_timer_fn+0x53/0x2e0 __run_timers+0x764/0xa80 Freed by task 99: kfree+0x1a7/0x500 process_one_work+0x7ec/0x1100 An association carries a per-connection SPI and key, so a child must not inherit the parent's. Clear it on clone.

References

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