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NVD / CVE Program· CNA Linux

CVE-2026-72491: net/9p: fix race condition on rdma->state in trans_rdma.c

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.72% (FIRST EPSS); higher than 54.3% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 13bf9879b778b2f4b260b45bed18f31806120d1e, 151f8cf5b23d8a534d884432a82a6d54d5a61989, 3970a19a80de530b801b6256354d4a529a9a2d6c.

Low priority for now. Upgrade to Linux Linux 13bf9879b778b2f4b260b45bed18f31806120d1e, 151f8cf5b23d8a534d884432a82a6d54d5a61989, 3970a19a80de530b801b6256354d4a529a9a2d6c 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/9p: fix race condition on rdma->state in trans_rdma.c The rdma->state field is modified without holding req_lock in both recv_done() and p9_cm_event_handler(), while rdma_request() accesses the same field under the req_lock spinlock. This inconsistent locking creates a race condition: - recv_done() running in softirq completion context sets rdma->state = P9_RDMA_FLUSHING without acquiring req_lock - p9_cm_event_handler() modifies rdma->state at multiple points (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without req_lock - rdma_request() uses spin_lock_irqsave(&rdma->req_lock, flags) to protect the read-modify-write of rdma->state The race can cause lost state transitions: recv_done() or the CM event handler could set state to FLUSHING/CLOSED while rdma_request() is concurrently checking or modifying state under the lock, leading to the FLUSHING transition being silently overwritten by CLOSING. This corrupts the connection state machine and can cause use-after-free on RDMA request objects during teardown. Fix by adding req_lock protection to all rdma->state modifications in recv_done() and p9_cm_event_handler(), matching the pattern already used in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore in the CM event handler since it can race with recv_done() which runs in softirq context. Tested with a kernel module that races two threads (simulating rdma_request and recv_done/CM handler) on rdma->state with proper locking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost transitions.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.7% · 54th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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.

Get told when this record changes

  • 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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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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

    • 3479b3c35e82ed10aa0ca2ee9e78c4eded06ba62, c01ddaa54d7411e964ffd250c018d8469c5852f2, 9e69c673fe077b8dc491cd8406c9bdcb1f76dee2, e48e7e27e4dfd00c81e0381e7cee610cce021452, 4.20affected
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before 4cee2b8766045059d5e0b8114837b4a8efe827acaffected · git
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before 5424138848eb7d7d8a7196676e90a2cbf2142454affected · git
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before 3970a19a80de530b801b6256354d4a529a9a2d6caffected · git
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before 8aadc136d8e8d8fc95d7982d213cfe2234dfcf2baffected · git
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before 151f8cf5b23d8a534d884432a82a6d54d5a61989affected · git
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before 13bf9879b778b2f4b260b45bed18f31806120d1eaffected · git
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before ebbcbe5c0db215feecc17def06178da443f4eea6affected · git
    • 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b and later · before 7d54894a1ee265a72d70f7cae1da6cc774cccc71affected · git
    • 4.4.185 and later · before 4.5affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-72487Aug 15, 2026 · PCI: Check ROM header and data structure addr before accessing
    30Monitor
  • ← EarlierCVE-2026-72488Aug 15, 2026 · soundwire: fix bug in sdw_add_element_group_count found by syzkaller
    31Monitor
  • Later →CVE-2026-72493Aug 15, 2026 · net: serialize netif_running() check in enqueue_to_backlog()
    39Monitor

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 Linux13bf9879b778b2f4b260b45bed18f31806120d1eVendor (CNA)
Linux Linux151f8cf5b23d8a534d884432a82a6d54d5a61989Vendor (CNA)
Linux Linux3970a19a80de530b801b6256354d4a529a9a2d6cVendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux4.5Vendor (CNA)
Linux Linux4cee2b8766045059d5e0b8114837b4a8efe827acVendor (CNA)
Linux Linux5424138848eb7d7d8a7196676e90a2cbf2142454Vendor (CNA)
Linux Linux7d54894a1ee265a72d70f7cae1da6cc774cccc71Vendor (CNA)
Linux Linux8aadc136d8e8d8fc95d7982d213cfe2234dfcf2bVendor (CNA)
Linux Linuxebbcbe5c0db215feecc17def06178da443f4eea6Vendor (CNA)
debian:linux6.1.180-1 · 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+1% in 7 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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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. SSVC exploitation— → none
  2. 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