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NVD / CVE Program· CNA Linux

CVE-2021-47345: RDMA/cma: Fix rdma_resolve_route() memory leak

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.25% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 032c68b4f5be128a2167f35b558b7cec88fe4972, 07583ba2e2d8947c3d365d97608cb436510885ac, 3d08b5917984f737f32d5bee9737b9075c3895c6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 032c68b4f5be128a2167f35b558b7cec88fe4972, 07583ba2e2d8947c3d365d97608cb436510885ac, 3d08b5917984f737f32d5bee9737b9075c3895c6 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: RDMA/cma: Fix rdma_resolve_route() memory leak Fix a memory leak when "mda_resolve_route() is called more than once on the same "rdma_cm_id". This is possible if cma_query_handler() triggers the RDMA_CM_EVENT_ROUTE_ERROR flow which puts the state machine back and allows rdma_resolve_route() to be called again.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 21, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 17th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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

If any of these changes, we'll tell you in the daily email digest.

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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?

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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 4.4.276
  • linux linux kernel4.5 and later · before 4.9.276
  • linux linux kernel4.10 and later · before 4.14.240
  • linux linux kernel4.15 and later · before 4.19.198
  • linux linux kernel4.20 and later · before 5.4.133
  • linux linux kernel5.5 and later · before 5.10.51
  • linux linux kernel5.11 and later · before 5.12.18
  • linux linux kernel5.13 and later · before 5.13.3

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

    • 2.6.18affected
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before 40b613db3a95bc27998e4097d74c2f7e5d083a0baffected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before e2da8ce2a9543f3ca5c93369bd1fe6eeb572101aaffected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before e4e062da082a199357ba4911145f331d40139ad8affected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before 4893c938f2a140a74be91779e45e4a7fa111198faffected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before 032c68b4f5be128a2167f35b558b7cec88fe4972affected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before 3d08b5917984f737f32d5bee9737b9075c3895c6affected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before f4f553d67236145fa5fd203ed7b35b9377e19939affected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before 07583ba2e2d8947c3d365d97608cb436510885acaffected · git
    • e51060f08a61965c4dd91516d82fe90617152590 and later · before 74f160ead74bfe5f2b38afb4fcf86189f9ff40c9affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.14.6-15.14.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-47343May 21, 2024 · dm btree remove: assign new_root only when removal succeeds
    22Monitor
  • ← EarlierCVE-2021-47344May 21, 2024 · media: zr364xx: fix memory leak in zr364xx_start_readpipe
    22Monitor
  • Later →CVE-2021-47346May 21, 2024 · coresight: tmc-etf: Fix global-out-of-bounds in tmc_update_etf_buffer()
    28Monitor

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 Linux032c68b4f5be128a2167f35b558b7cec88fe4972Vendor (CNA)
Linux Linux07583ba2e2d8947c3d365d97608cb436510885acVendor (CNA)
Linux Linux3d08b5917984f737f32d5bee9737b9075c3895c6Vendor (CNA)
Linux Linux40b613db3a95bc27998e4097d74c2f7e5d083a0bVendor (CNA)
Linux Linux4893c938f2a140a74be91779e45e4a7fa111198fVendor (CNA)
Linux Linux74f160ead74bfe5f2b38afb4fcf86189f9ff40c9Vendor (CNA)
Linux Linuxe2da8ce2a9543f3ca5c93369bd1fe6eeb572101aVendor (CNA)
Linux Linuxe4e062da082a199357ba4911145f331d40139ad8Vendor (CNA)
Linux Linuxf4f553d67236145fa5fd203ed7b35b9377e19939Vendor (CNA)
debian:linux5.14.6-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

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

nvd-primary

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. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records