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NVD / CVE Program· CNA Linux

CVE-2022-49086: net: openvswitch: fix leak of nested actions

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: 0.26% (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 1f30fb9166d4f15a1aa19449b9da871fe0ed4796, 3554c214b83ec9a839ed574263a34218f372990c, 53bce9d19b0a9d245b25cd050b81652ed974a509.

Low priority for now. Upgrade to Linux Linux 1f30fb9166d4f15a1aa19449b9da871fe0ed4796, 3554c214b83ec9a839ed574263a34218f372990c, 53bce9d19b0a9d245b25cd050b81652ed974a509 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: openvswitch: fix leak of nested actions While parsing user-provided actions, openvswitch module may dynamically allocate memory and store pointers in the internal copy of the actions. So this memory has to be freed while destroying the actions. Currently there are only two such actions: ct() and set(). However, there are many actions that can hold nested lists of actions and ovs_nla_free_flow_actions() just jumps over them leaking the memory. For example, removal of the flow with the following actions will lead to a leak of the memory allocated by nf_ct_tmpl_alloc(): actions:clone(ct(commit),0) Non-freed set() action may also leak the 'dst' structure for the tunnel info including device references. Under certain conditions with a high rate of flow rotation that may cause significant memory leak problem (2MB per second in reporter's case). The problem is also hard to mitigate, because the user doesn't have direct control over the datapath flows generated by OVS. Fix that by iterating over all the nested actions and freeing everything that needs to be freed recursively. New build time assertion should protect us from this problem if new actions will be added in the future. Unfortunately, openvswitch module doesn't use NLA_F_NESTED, so all attributes has to be explicitly checked. sample() and clone() actions are mixing extra attributes into the user-provided action list. That prevents some code generalization too.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 18th 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%

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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?

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 kernel4.3 and later · before 4.19.249
  • linux linux kernel4.20 and later · before 5.4.200
  • 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

    • 4.3affected
    • 34ae932a40369be6bd6ea97d66b6686361b4370d and later · before 7438dc55c0709819b813f4778aec2c48b782990baffected · git
    • 34ae932a40369be6bd6ea97d66b6686361b4370d and later · before ef6f9ce0a79aa23b10fc5f3b3cab3814a25aac40affected · git
    • 34ae932a40369be6bd6ea97d66b6686361b4370d and later · before 5ae05b5eb58773cfec307ff88aff4cfd843c4cffaffected · git
    • 34ae932a40369be6bd6ea97d66b6686361b4370d and later · before 837b96d8103938e35e7d92cd9db96af914ca4fffaffected · git
    • 34ae932a40369be6bd6ea97d66b6686361b4370d and later · before 3554c214b83ec9a839ed574263a34218f372990caffected · git
    • 34ae932a40369be6bd6ea97d66b6686361b4370d and later · before 53bce9d19b0a9d245b25cd050b81652ed974a509affected · git
    • 34ae932a40369be6bd6ea97d66b6686361b4370d and later · before 1f30fb9166d4f15a1aa19449b9da871fe0ed4796affected · git
    • before 4.3not affected · semver
    • 4.19.249 and later · up to and including 4.19.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.17.3-15.17.3-1
Red Hat:rhel_eus:8.4::baseosbpftoolbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseosbpftool-debuginfobefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernelbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-abi-stablelistsbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-corebefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debugbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debug-corebefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debug-debuginfobefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debug-develbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debug-modulesbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debug-modules-extrabefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debuginfobefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debuginfo-common-s390xbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-develbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-docbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-modulesbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-modules-extrabefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-toolsbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-tools-debuginfobefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4
Red Hat:rhel_eus:8.4::baseoskernel-tools-libsbefore 0:4.18.0-305.57.1.el8_40:4.18.0-305.57.1.el8_4

+52

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-2022-49084Feb 26, 2025 · qede: confirm skb is allocated before using
    22Monitor
  • ← EarlierCVE-2022-49085Feb 26, 2025 · drbd: Fix five use after free bugs in get_initial_state
    31Monitor
  • Later →CVE-2022-49087Feb 26, 2025 · rxrpc: fix a race in rxrpc_exit_net()
    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 / packageFixed versionSource
Linux Linux1f30fb9166d4f15a1aa19449b9da871fe0ed4796Vendor (CNA)
Linux Linux3554c214b83ec9a839ed574263a34218f372990cVendor (CNA)
Linux Linux53bce9d19b0a9d245b25cd050b81652ed974a509Vendor (CNA)
Linux Linux5ae05b5eb58773cfec307ff88aff4cfd843c4cffVendor (CNA)
Linux Linux7438dc55c0709819b813f4778aec2c48b782990bVendor (CNA)
Linux Linux837b96d8103938e35e7d92cd9db96af914ca4fffVendor (CNA)
Linux Linuxef6f9ce0a79aa23b10fc5f3b3cab3814a25aac40Vendor (CNA)
debian:linux5.17.3-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-305.57.1.el8_4 · Red Hat:rhel_eus:8.4::baseosPackage registry (OSV)
suse:kernel-default4.12.14-122.258.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)
suse:kernel-source4.12.14-122.258.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kernel-syms4.12.14-122.258.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_681-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package 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
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 (6 more)

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

All records