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NVD / CVE Program· CNA Linux

CVE-2026-90081: net/rds: use wq_has_sleeper() in rds_cong_map_updated()

—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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 0e169f6a2adeb17b5577ed7e8abd642465bb50ec, 281f9fda2e06d6c211bb365a5379ed2e05cc2e21, 2a809d7896dbf18e1ecfbdd930f71c9fc298b16d; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 0e169f6a2adeb17b5577ed7e8abd642465bb50ec, 281f9fda2e06d6c211bb365a5379ed2e05cc2e21, 2a809d7896dbf18e1ecfbdd930f71c9fc298b16d; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: net/rds: use wq_has_sleeper() in rds_cong_map_updated() rds_cong_map_updated() runs after a peer's congestion map has been rewritten (by rds_tcp_cong_recv() and rds_ib_cong_recv(), or the clear-all in the loopback and IB send-completion paths). It bumps rds_cong_generation and then checks waitqueue_active() on map->m_waitq and on rds_poll_waitq to decide whether anyone needs waking. atomic_inc() carries no ordering and waitqueue_active() is a plain load, so nothing orders the map and generation stores before the wait queue reads. The waiters do the mirror image: rds_cong_wait() adds itself to m_waitq and then tests the port bit, and rds_poll() registers on rds_poll_waitq and then reads the generation. That is the store-buffering pattern described above waitqueue_active() in include/linux/wait.h - the updater can observe an empty wait queue while the waiter still observes the port as congested, and no wake-up is issued. rds_cong_wait() is an interruptible sleep with no timeout, so a sender blocked on a congested port stays blocked until the next congestion update from that peer arrives or a signal is delivered. A poll() waiter misses the map-updated notification the same way. Use wq_has_sleeper(), which is waitqueue_active() preceded by the required full barrier, as rds_tcp_state_change() already does for the same pattern.

Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th 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 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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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

    • 2.6.30affected
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before 2a809d7896dbf18e1ecfbdd930f71c9fc298b16daffected · git
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before fa4b98e891fda28cc0638d809c6125ec63d8319daffected · git
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before 0e169f6a2adeb17b5577ed7e8abd642465bb50ecaffected · git
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before 42884bd8b8fd023d6a610a695bd5ddd1d5dece17affected · git
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before a526214b9f0548ca0e53a6e0d1727d8ea9befc23affected · git
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before bf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5affected · git
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before 281f9fda2e06d6c211bb365a5379ed2e05cc2e21affected · git
    • 922cb17a5c812fcc9ebee249f4109db099896941 and later · before d4f484661961636eb90d287050959e613795f73aaffected · git
    • before 2.6.30not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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-2026-90079Sep 17, 2026 · octeontx2-af: fix cn20k mailbox lifetime on repeated rvu_mbox_init()
    0Monitor
  • ← EarlierCVE-2026-90080Sep 17, 2026 · octeontx2-pf: fix NULL deref of af_xdp_zc_qidx on rep setup
    0Monitor
  • Later →CVE-2026-90082Sep 17, 2026 · net: mana: Cap MSI-X vectors to the device MSI-X table size
    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 Linux0e169f6a2adeb17b5577ed7e8abd642465bb50ecVendor (CNA)
Linux Linux281f9fda2e06d6c211bb365a5379ed2e05cc2e21Vendor (CNA)
Linux Linux2a809d7896dbf18e1ecfbdd930f71c9fc298b16dVendor (CNA)
Linux Linux42884bd8b8fd023d6a610a695bd5ddd1d5dece17Vendor (CNA)
Linux Linuxa526214b9f0548ca0e53a6e0d1727d8ea9befc23Vendor (CNA)
Linux Linuxbf2b8130723efcb5b86c3ddb6317c3a9b2a9cfc5Vendor (CNA)
Linux Linuxd4f484661961636eb90d287050959e613795f73aVendor (CNA)
Linux Linuxfa4b98e891fda28cc0638d809c6125ec63d8319dVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package 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.

No dated events beyond publication.

EPSS, last 120 days

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

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.

References

Show all references (7 more)

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

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