NVD / CVE Program· CNA Linux

CVE-2022-49085: drbd: Fix five use after free bugs in get_initial_state

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: 0.28% (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 0489700bfeb1e53eb2039c2291c67e71b0b40103, 188fe6b26765edbad4055611c0f788b6870f4024, 226e993c39405292781bfcf4b039a8db56aab362.

Low priority for now. Upgrade to Linux Linux 0489700bfeb1e53eb2039c2291c67e71b0b40103, 188fe6b26765edbad4055611c0f788b6870f4024, 226e993c39405292781bfcf4b039a8db56aab362 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: drbd: Fix five use after free bugs in get_initial_state In get_initial_state, it calls notify_initial_state_done(skb,..) if cb->args[5]==1. If genlmsg_put() failed in notify_initial_state_done(), the skb will be freed by nlmsg_free(skb). Then get_initial_state will goto out and the freed skb will be used by return value skb->len, which is a uaf bug. What's worse, the same problem goes even further: skb can also be freed in the notify_*_state_change -> notify_*_state calls below. Thus 4 additional uaf bugs happened. My patch lets the problem callee functions: notify_initial_state_done and notify_*_state_change return an error code if errors happen. So that the error codes could be propagated and the uaf bugs can be avoid. v2 reports a compilation warning. This v3 fixed this warning and built successfully in my local environment with no additional warnings. v2: https://lore.kernel.org/patchwork/patch/1435218/

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

BDU:2025-06573

Published: Feb 26, 2025
Updated: Aug 5, 2026
EPSS: 0.2% · 20th percentile
CWE: CWE-416

Report tools

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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.

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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?

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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 kernel4.5 and later · before 4.9.311
linux linux kernel4.10 and later · before 4.14.276
linux linux kernel4.15 and later · before 4.19.238
linux linux kernel4.20 and later · before 5.4.189
linux linux kernel5.5 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
- 4.5affected
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before 0489700bfeb1e53eb2039c2291c67e71b0b40103affected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before dcf6be17b5c53b741898d2223b23e66d682de300affected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before 188fe6b26765edbad4055611c0f788b6870f4024affected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before b6a4055036eed1f5e239ce3d8b0db1ce38bba447affected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before 594205b4936771a250f9d141e7e0fff21c3dd2d9affected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before a972c768723359ec995579902473028fe3cd64b1affected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before de63e74da2333b4068bb79983e632db730fea97eaffected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before 226e993c39405292781bfcf4b039a8db56aab362affected · git
- a29728463b254ce81ecefdf20c1a02e01d9361da and later · before aadb22ba2f656581b2f733deb3a467c48cc618f6affected · git

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

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-2022-49083Feb 26, 2025 · iommu/omap: Fix regression in probe for NULL pointer dereference
22Monitor
← EarlierCVE-2022-49084Feb 26, 2025 · qede: confirm skb is allocated before using
22Monitor
Later →CVE-2022-49086Feb 26, 2025 · net: openvswitch: fix leak of nested actions
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	0489700bfeb1e53eb2039c2291c67e71b0b40103	Vendor (CNA)
Linux Linux	188fe6b26765edbad4055611c0f788b6870f4024	Vendor (CNA)
Linux Linux	226e993c39405292781bfcf4b039a8db56aab362	Vendor (CNA)
Linux Linux	594205b4936771a250f9d141e7e0fff21c3dd2d9	Vendor (CNA)
Linux Linux	a972c768723359ec995579902473028fe3cd64b1	Vendor (CNA)
Linux Linux	aadb22ba2f656581b2f733deb3a467c48cc618f6	Vendor (CNA)
Linux Linux	b6a4055036eed1f5e239ce3d8b0db1ce38bba447	Vendor (CNA)
Linux Linux	dcf6be17b5c53b741898d2223b23e66d682de300	Vendor (CNA)
Linux Linux	de63e74da2333b4068bb79983e632db730fea97e	Vendor (CNA)
debian:linux	5.17.3-1 · 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.

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, 10:09 PM UTC

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

References

git.kernel.org/stable/c/0489700bfeb1e53eb2039c2291c67e71b0b40103

Show all references (8 more)

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

All records