VulnerabilityPublished 23 Oct 2026

CVE-2026-99038: Linux kernel · memstick: rtsx_usb_ms: complete requests after eject instead of dropping them

Source GCVE Database

Authoritative record:CVE-2026-99038· Medium

Not known to be exploited · fixed in f2c181e1d58e911804e14543b2f1cc6b23a0d4d6 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f2c181e1d58e911804e14543b2f1cc6b23a0d4d6, d7e811c3a49cd5cff529c157df886719e09370ec, c96ca94425b076dc398d929366e378d1e22ec794 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 23 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-95v5-2rxr-2qx7

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40, < f2c181e1d58e911804e14543b2f1cc6b23a0d4d6	Fixed in f2c181e1d58e911804e14543b2f1cc6b23a0d4d6
LinuxLinux	Affected ≥ 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40, < d7e811c3a49cd5cff529c157df886719e09370ec	Fixed in d7e811c3a49cd5cff529c157df886719e09370ec
LinuxLinux	Affected ≥ 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40, < c96ca94425b076dc398d929366e378d1e22ec794	Fixed in c96ca94425b076dc398d929366e378d1e22ec794
LinuxLinux	Affected ≥ 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40, < 5616da0f92339328fa1472876df51555e15ad340	Fixed in 5616da0f92339328fa1472876df51555e15ad340
LinuxLinux	Affected ≥ 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40, < 5b599e28aeb3684772aef64f46cc6f25f4c67128	Fixed in 5b599e28aeb3684772aef64f46cc6f25f4c67128
LinuxLinux	Affected =3.16	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: memstick: rtsx_usb_ms: complete requests after eject instead of dropping them memstick_check() can pass its host->removing check just before rtsx_usb_ms_drv_remove() sets eject/removing. Its next request is then silently dropped: rtsx_usb_ms_request() skips schedule_work() once eject is set, and drv_remove's cancel_work_sync() can also cancel a queued handle_req before it picks the request up. Nobody completes card->mrq_complete. Once memstick core waits for requests without a timeout ("memstick: core: wait for request completion before freeing card"), this hangs removal: memstick_check() never returns and memstick_remove_host() blocks in flush_workqueue(): INFO: task kworker/u10:3:65 blocked for more than 20 seconds. Workqueue: kmemstick memstick_check __wait_for_common memstick_check INFO: task kworker/1:1:33 blocked for more than 20 seconds. Workqueue: usb_hub_wq hub_event __flush_workqueue memstick_remove_host rtsx_usb_ms_drv_remove Never drop a request. rtsx_usb_ms_request() always schedules handle_req, and handle_req fails requests with -ENOMEDIUM once eject is set, without touching the device. drv_remove flushes handle_req instead of cancelling it, and cancels it only after memstick_remove_host(), when no new request can arrive, so it cannot run on a freed host. The host_mutex drain in drv_remove is removed: handle_req always leaves host->req NULL when it finishes, so the drain never had anything to do, and it would now race with handle_req.

References

Community reviews

Loading reviews…