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CVE.org (no NVD analysis yet)· CNA Linux

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

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 5616da0f92339328fa1472876df51555e15ad340, 5b599e28aeb3684772aef64f46cc6f25f4c67128, 602a00d75d2ab079c9ab7c0d7b56ae436e604148; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 5616da0f92339328fa1472876df51555e15ad340, 5b599e28aeb3684772aef64f46cc6f25f4c67128, 602a00d75d2ab079c9ab7c0d7b56ae436e604148; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Oct 23, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.16affected
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before c48245ef696e590e92cbfb622625642bec8dbbadaffected · git
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before 602a00d75d2ab079c9ab7c0d7b56ae436e604148affected · git
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before 8e4eda6e1b00624820fea1d35508d7422330ee25affected · git
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before f2c181e1d58e911804e14543b2f1cc6b23a0d4d6affected · git
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before 5b599e28aeb3684772aef64f46cc6f25f4c67128affected · git
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before d7e811c3a49cd5cff529c157df886719e09370ecaffected · git
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before 5616da0f92339328fa1472876df51555e15ad340affected · git
    • 99451dceeb5fdd789f0a2eeb3ee029e80d2ccc40 and later · before c96ca94425b076dc398d929366e378d1e22ec794affected · git
    • before 3.16not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.11-17.2.11-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99036Oct 23, 2026 · dm: fix reading free memory in do_resume
    0Monitor
  • ← EarlierCVE-2026-99037Oct 23, 2026 · dm-crypt: reject the lmk IV mode with AEAD ciphers
    0Monitor
  • Later →CVE-2026-99039Oct 23, 2026 · memstick: core: wait for request completion before freeing card
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux5616da0f92339328fa1472876df51555e15ad340Vendor (CNA)
Linux Linux5b599e28aeb3684772aef64f46cc6f25f4c67128Vendor (CNA)
Linux Linux602a00d75d2ab079c9ab7c0d7b56ae436e604148Vendor (CNA)
Linux Linux8e4eda6e1b00624820fea1d35508d7422330ee25Vendor (CNA)
Linux Linuxc48245ef696e590e92cbfb622625642bec8dbbadVendor (CNA)
Linux Linuxc96ca94425b076dc398d929366e378d1e22ec794Vendor (CNA)
Linux Linuxd7e811c3a49cd5cff529c157df886719e09370ecVendor (CNA)
Linux Linuxf2c181e1d58e911804e14543b2f1cc6b23a0d4d6Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 12, 2026+20 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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