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

CVE-2026-98257: rds: ib: use rds_conn_drop() on protocol version mismatch

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.50% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 14fb90067d13f4494cff0f03243fae3cf2911cbc, 344c72a0bc2703a6de4918ed935850e07dae3af2, 424019be3f637da76b74f44a40034669acbb166f; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 14fb90067d13f4494cff0f03243fae3cf2911cbc, 344c72a0bc2703a6de4918ed935850e07dae3af2, 424019be3f637da76b74f44a40034669acbb166f; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: rds: ib: use rds_conn_drop() on protocol version mismatch rds_ib_cm_connect_complete() runs from the RDMA-CM event handler with conn->c_cm_lock held. When the peer negotiates a protocol version older than RDS_PROTOCOL_COMPAT_VERSION, the handler calls rds_conn_destroy(), which is only safe in the rmmod path: it synchronously tears the connection down and flush_work()es the shutdown work cp_down_w. That shutdown work (rds_conn_shutdown()) needs cp_cm_lock, which is the very lock the event handler still holds, so the flush never completes: the two workers wait on each other and the RDS connection workqueues stall for good. All other RDMA-CM failure paths (REJECTED, CONNECT_ERROR, DISCONNECTED) use rds_conn_drop(), which marks the connection RDS_CONN_ERROR and schedules the shutdown work asynchronously. Use it here as well.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 43th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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

    • 2.6.37affected
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before 424019be3f637da76b74f44a40034669acbb166faffected · git
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before 14fb90067d13f4494cff0f03243fae3cf2911cbcaffected · git
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before 344c72a0bc2703a6de4918ed935850e07dae3af2affected · git
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before b5c9f2951d330d4a198a64d6e60f79b4bd6ef078affected · git
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before d392b16acd0908f077289aad8bba066ff16de336affected · git
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before 65ca0a5037152a5a80b8fe6aac80eb80458be573affected · git
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before 7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8affected · git
    • f147dd9ecabf23fd63d2562ffe64252a0453ecde and later · before f97d8c7bab7843631206a114986c9059da03efebaffected · git
    • before 2.6.37not 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 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

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-2026-98255Oct 6, 2026 · tcp: exclude old ACKs from tcp fast path
    0Monitor
  • ← EarlierCVE-2026-98256Oct 6, 2026 · signal: Prevent exec() race
    31Monitor
  • Later →CVE-2026-98258Oct 6, 2026 · posix-cpu-timers: Prevent freeing a timer which is queued on the expiry list
    31Monitor

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 Linux14fb90067d13f4494cff0f03243fae3cf2911cbcVendor (CNA)
Linux Linux344c72a0bc2703a6de4918ed935850e07dae3af2Vendor (CNA)
Linux Linux424019be3f637da76b74f44a40034669acbb166fVendor (CNA)
Linux Linux65ca0a5037152a5a80b8fe6aac80eb80458be573Vendor (CNA)
Linux Linux7d8c22cb2cb1efb5e830a4545c76abf7b35cc2e8Vendor (CNA)
Linux Linuxb5c9f2951d330d4a198a64d6e60f79b4bd6ef078Vendor (CNA)
Linux Linuxd392b16acd0908f077289aad8bba066ff16de336Vendor (CNA)
Linux Linuxf97d8c7bab7843631206a114986c9059da03efebVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 11, 2026+36 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).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

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. CVSS— → 7.5
  2. Severity— → high
  3. Exploit maturity— → none
  4. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records