NVD / CVE Program· CNA Linux

CVE-2024-38544: RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt

Noroxi assessment

Priority: Monitor (action score 25/100)

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: 0.81% (FIRST EPSS); higher than 56.7% of all records.
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
Fixed version: Linux Linux 21b4c6d4d89030fd4657a8e7c8110fd941049794, 2b23b6097303ed0ba5f4bc036a1c07b6027af5c6, 30df4bef8b8e183333e9b6e9d4509d552c7da6eb.
Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 6.3.

Low priority for now. Upgrade to Linux Linux 21b4c6d4d89030fd4657a8e7c8110fd941049794, 2b23b6097303ed0ba5f4bc036a1c07b6027af5c6, 30df4bef8b8e183333e9b6e9d4509d552c7da6eb 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/rxe: Fix seg fault in rxe_comp_queue_pkt In rxe_comp_queue_pkt() an incoming response packet skb is enqueued to the resp_pkts queue and then a decision is made whether to run the completer task inline or schedule it. Finally the skb is dereferenced to bump a 'hw' performance counter. This is wrong because if the completer task is already running in a separate thread it may have already processed the skb and freed it which can cause a seg fault. This has been observed infrequently in testing at high scale. This patch fixes this by changing the order of enqueuing the packet until after the counter is accessed.

MediumCVSS 6.3 · v3.1—No exploit Fix available

Memory safety

Published: Jun 19, 2024
Updated: Aug 5, 2026
EPSS: 0.8% · 56th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 25 / 40 · 6.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.8%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 6.3
CNA · Linux: 9.8; 3.5 point gap

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

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

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

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel4.12 and later · before 5.4.285
linux linux kernel5.5 and later · before 5.10.227
linux linux kernel5.11 and later · before 5.15.168
linux linux kernel5.16 and later · before 6.1.93
linux linux kernel6.2 and later · before 6.6.33
linux linux kernel6.7 and later · before 6.8.12
linux linux kernel6.9 and later · before 6.9.3

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
- 4.12affected
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before c91fb72a2ca6480d8d77262eef52dc5b178463a3affected · git
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before de5a059e36657442b5637cc16df5163e435b9cb4affected · git
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before e0e14dd35d4242340c7346aac60c7ff8fbf87ffcaffected · git
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19affected · git
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before 21b4c6d4d89030fd4657a8e7c8110fd941049794affected · git
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before bbad88f111a1829f366c189aa48e7e58e57553fcaffected · git
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before 30df4bef8b8e183333e9b6e9d4509d552c7da6ebaffected · git
- 0b1e5b99a48b5b810e3e38f1d6e0d39306b99ec0 and later · before 2b23b6097303ed0ba5f4bc036a1c07b6027af5c6affected · git
- before 4.12not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:11	linux	before 5.10.234-1	5.10.234-1
Debian:12	linux	before 6.1.94-1	6.1.94-1
Debian:13	linux	before 6.8.12-1	6.8.12-1

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-2024-38542Jun 19, 2024 · RDMA/mana_ib: boundary check before installing cq callbacks
31Monitor
← EarlierCVE-2024-38543Jun 19, 2024 · lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure
22Monitor
Later →CVE-2024-38545Jun 19, 2024 · RDMA/hns: Fix UAF for cq async event
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 / package	Fixed version	Source
Linux Linux	21b4c6d4d89030fd4657a8e7c8110fd941049794	Vendor (CNA)
Linux Linux	2b23b6097303ed0ba5f4bc036a1c07b6027af5c6	Vendor (CNA)
Linux Linux	30df4bef8b8e183333e9b6e9d4509d552c7da6eb	Vendor (CNA)
Linux Linux	bbad88f111a1829f366c189aa48e7e58e57553fc	Vendor (CNA)
Linux Linux	c91fb72a2ca6480d8d77262eef52dc5b178463a3	Vendor (CNA)
Linux Linux	de5a059e36657442b5637cc16df5163e435b9cb4	Vendor (CNA)
Linux Linux	e0e14dd35d4242340c7346aac60c7ff8fbf87ffc	Vendor (CNA)
Linux Linux	faa8d0ecf6c9c7c2ace3ca3e552180ada6f75e19	Vendor (CNA)
debian:linux	6.1.94-1 · Debian:12	Package 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

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: none
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/21b4c6d4d89030fd4657a8e7c8110fd941049794

Show all references (8 more)

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

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