NVD / CVE Program· CNA Linux

CVE-2022-49076: RDMA/hfi1: Fix use-after-free bug for mm struct

Noroxi assessment

Priority: Monitor (action score 31/100)

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 0b7186d657ee55e2cdefae498f07d5c1961e8023, 2bbac98d0930e8161b1957dc0ec99de39ade1b3c, 5.10.

Low priority for now. Upgrade to Linux Linux 0b7186d657ee55e2cdefae498f07d5c1961e8023, 2bbac98d0930e8161b1957dc0ec99de39ade1b3c, 5.10 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/hfi1: Fix use-after-free bug for mm struct Under certain conditions, such as MPI_Abort, the hfi1 cleanup code may represent the last reference held on the task mm. hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed before the final use in hfi1_release_user_pages(). A new task may allocate the mm structure while it is still being used, resulting in problems. One manifestation is corruption of the mmap_sem counter leading to a hang in down_write(). Another is corruption of an mm struct that is in use by another task.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Feb 26, 2025
Updated: Aug 5, 2026
EPSS: 0.2% · 17th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; 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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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 kernel5.9.12 and later · before 5.10.111
linux linux kernel5.11 and later · before 5.15.34
linux linux kernel5.16 and later · before 5.16.20
linux linux kernel5.17 and later · before 5.17.3
linux linux kernel5.18

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
- 5732f83596f8a573f2cde814cc76a54e1a8995c7, 5.10affected
- 3d2a9d642512c21a12d19b9250e7a835dcb41a79 and later · before 5f54364ff6cfcd14cddf5441c4a490bb28dd69f7affected · git
- 3d2a9d642512c21a12d19b9250e7a835dcb41a79 and later · before 9ca11bd8222a612de0d2f54d050bfcf61ae2883faffected · git
- 3d2a9d642512c21a12d19b9250e7a835dcb41a79 and later · before 0b7186d657ee55e2cdefae498f07d5c1961e8023affected · git
- 3d2a9d642512c21a12d19b9250e7a835dcb41a79 and later · before 5a9a1b24ddb510715f8f621263938186579a965caffected · git
- 3d2a9d642512c21a12d19b9250e7a835dcb41a79 and later · before 2bbac98d0930e8161b1957dc0ec99de39ade1b3caffected · git
- 5.9.12 and later · before 5.10affected · semver
- before 5.10not affected · semver
- 5.10.111 and later · up to and including 5.10.*not affected · semver
- 5.15.34 and later · up to and including 5.15.*not 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:12	linux	before 5.17.3-1	5.17.3-1
SUSE:Linux Enterprise Live Patching 12 SP5	kernel-default	before 4.12.14-122.250.1	4.12.14-122.250.1
SUSE:Linux Enterprise Live Patching 12 SP5	kgraft-patch-SLE12-SP5_Update_66	before 1-8.3.1	1-8.3.1
SUSE:Linux Enterprise Server 12 SP5-LTSS	kernel-source	before 4.12.14-122.250.1	4.12.14-122.250.1
SUSE:Linux Enterprise Server 12 SP5-LTSS	kernel-syms	before 4.12.14-122.250.1	4.12.14-122.250.1

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-2022-49074Feb 26, 2025 · irqchip/gic-v3: Fix GICR_CTLR.RWP polling
22Monitor
← EarlierCVE-2022-49075Feb 26, 2025 · btrfs: fix qgroup reserve overflow the qgroup limit
22Monitor
Later →CVE-2022-49077Feb 26, 2025 · mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)
22Monitor

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	0b7186d657ee55e2cdefae498f07d5c1961e8023	Vendor (CNA)
Linux Linux	2bbac98d0930e8161b1957dc0ec99de39ade1b3c	Vendor (CNA)
Linux Linux	5.10	Vendor (CNA)
Linux Linux	5a9a1b24ddb510715f8f621263938186579a965c	Vendor (CNA)
Linux Linux	5f54364ff6cfcd14cddf5441c4a490bb28dd69f7	Vendor (CNA)
Linux Linux	9ca11bd8222a612de0d2f54d050bfcf61ae2883f	Vendor (CNA)
debian:linux	5.17.3-1 · Debian:12	Package registry (OSV)
suse:kernel-default	4.12.14-122.250.1 · SUSE:Linux Enterprise Live Patching 12 SP5	Package registry (OSV)
suse:kernel-source	4.12.14-122.250.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS	Package registry (OSV)
suse:kernel-syms	4.12.14-122.250.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS	Package registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_66	1-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5	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.

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).

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

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

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

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/0b7186d657ee55e2cdefae498f07d5c1961e8023

Show all references (4 more)

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

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