NVD / CVE Program· CNA Linux

CVE-2021-47023: net: marvell: prestera: fix port event handling on init

HighCVSS 8.2 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

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: 0.84% (FIRST EPSS); higher than 58.3% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: Linux Linux 0ce6052802be2cb61a57b753e41301339c88c839, 333980481b99edb24ebd5d1a53af70a15d9146de, 9d1ba11fabdd8f25abb24272ef1621417981320b.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0ce6052802be2cb61a57b753e41301339c88c839, 333980481b99edb24ebd5d1a53af70a15d9146de, 9d1ba11fabdd8f25abb24272ef1621417981320b 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: marvell: prestera: fix port event handling on init For some reason there might be a crash during ports creation if port events are handling at the same time because fw may send initial port event with down state. The crash points to cancel_delayed_work() which is called when port went is down. Currently I did not find out the real cause of the issue, so fixed it by cancel port stats work only if previous port's state was up & runnig. The following is the crash which can be triggered: [ 28.311104] Unable to handle kernel paging request at virtual address 000071775f776600 [ 28.319097] Mem abort info: [ 28.321914] ESR = 0x96000004 [ 28.324996] EC = 0x25: DABT (current EL), IL = 32 bits [ 28.330350] SET = 0, FnV = 0 [ 28.333430] EA = 0, S1PTW = 0 [ 28.336597] Data abort info: [ 28.339499] ISV = 0, ISS = 0x00000004 [ 28.343362] CM = 0, WnR = 0 [ 28.346354] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000100bf7000 [ 28.352842] [000071775f776600] pgd=0000000000000000, p4d=0000000000000000 [ 28.359695] Internal error: Oops: 96000004 [#1] PREEMPT SMP [ 28.365310] Modules linked in: prestera_pci(+) prestera uio_pdrv_genirq [ 28.372005] CPU: 0 PID: 1291 Comm: kworker/0:1H Not tainted 5.11.0-rc4 #1 [ 28.378846] Hardware name: DNI AmazonGo1 A7040 board (DT) [ 28.384283] Workqueue: prestera_fw_wq prestera_fw_evt_work_fn [prestera_pci] [ 28.391413] pstate: 60000085 (nZCv daIf -PAN -UAO -TCO BTYPE=--) [ 28.397468] pc : get_work_pool+0x48/0x60 [ 28.401442] lr : try_to_grab_pending+0x6c/0x1b0 [ 28.406018] sp : ffff80001391bc60 [ 28.409358] x29: ffff80001391bc60 x28: 0000000000000000 [ 28.414725] x27: ffff000104fc8b40 x26: ffff80001127de88 [ 28.420089] x25: 0000000000000000 x24: ffff000106119760 [ 28.425452] x23: ffff00010775dd60 x22: ffff00010567e000 [ 28.430814] x21: 0000000000000000 x20: ffff80001391bcb0 [ 28.436175] x19: ffff00010775deb8 x18: 00000000000000c0 [ 28.441537] x17: 0000000000000000 x16: 000000008d9b0e88 [ 28.446898] x15: 0000000000000001 x14: 00000000000002ba [ 28.452261] x13: 80a3002c00000002 x12: 00000000000005f4 [ 28.457622] x11: 0000000000000030 x10: 000000000000000c [ 28.462985] x9 : 000000000000000c x8 : 0000000000000030 [ 28.468346] x7 : ffff800014400000 x6 : ffff000106119758 [ 28.473708] x5 : 0000000000000003 x4 : ffff00010775dc60 [ 28.479068] x3 : 0000000000000000 x2 : 0000000000000060 [ 28.484429] x1 : 000071775f776600 x0 : ffff00010775deb8 [ 28.489791] Call trace: [ 28.492259] get_work_pool+0x48/0x60 [ 28.495874] cancel_delayed_work+0x38/0xb0 [ 28.500011] prestera_port_handle_event+0x90/0xa0 [prestera] [ 28.505743] prestera_evt_recv+0x98/0xe0 [prestera] [ 28.510683] prestera_fw_evt_work_fn+0x180/0x228 [prestera_pci] [ 28.516660] process_one_work+0x1e8/0x360 [ 28.520710] worker_thread+0x44/0x480 [ 28.524412] kthread+0x154/0x160 [ 28.527670] ret_from_fork+0x10/0x38 [ 28.531290] Code: a8c17bfd d50323bf d65f03c0 9278dc21 (f9400020) [ 28.537429] ---[ end trace 5eced933df3a080b ]---

BDU:2025-05307

Published: Feb 28, 2024
Updated: Jun 17, 2026
EPSS: 0.8% · 58th percentile
CWE: CWE-400

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 32 / 40 · 8.2 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.8%

CISA SSVC decision

Exploitation: none
Automatable: yes
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.

Is your version affected? Check it

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

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
- 5.10affected
- 501ef3066c89d7f9045315e1be58749cf9e6814d and later · before 0ce6052802be2cb61a57b753e41301339c88c839affected · git
- 501ef3066c89d7f9045315e1be58749cf9e6814d and later · before b5bba6ede42693f50ce1c9944315cefed7491061affected · git
- 501ef3066c89d7f9045315e1be58749cf9e6814d and later · before 9d1ba11fabdd8f25abb24272ef1621417981320baffected · git
- 501ef3066c89d7f9045315e1be58749cf9e6814d and later · before 333980481b99edb24ebd5d1a53af70a15d9146deaffected · git
- before 5.10not affected · semver
- 5.10.37 and later · up to and including 5.10.*not affected · semver
- 5.11.21 and later · up to and including 5.11.*not affected · semver
- 5.12.4 and later · up to and including 5.12.*not affected · semver
- 5.13 and laternot affected · original_commit_for_fix

Affected versions

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

linux linux kernel5.10 and later · before 5.10.37
linux linux kernel5.11 and later · before 5.11.21
linux linux kernel5.12 and later · before 5.12.4

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 5.10.38-1	5.10.38-1

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-2021-47021Feb 28, 2024 · mt76: mt7915: fix memleak when mt7915_unregister_device()
22Monitor
← EarlierCVE-2021-47022Feb 28, 2024 · mt76: mt7615: fix memleak when mt7615_unregister_device()
22Monitor
Later →CVE-2021-47024Feb 28, 2024 · vsock/virtio: free queued packets when closing socket
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	0ce6052802be2cb61a57b753e41301339c88c839	Vendor (CNA)
Linux Linux	333980481b99edb24ebd5d1a53af70a15d9146de	Vendor (CNA)
Linux Linux	9d1ba11fabdd8f25abb24272ef1621417981320b	Vendor (CNA)
Linux Linux	b5bba6ede42693f50ce1c9944315cefed7491061	Vendor (CNA)
debian:linux	5.10.38-1 · 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.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2024-39462118 days apartclk: bcm: dvp: Assign ->num before accessing ->hws
39Monitor
CVE-2021-4440118 days apartx86/xen: Drop USERGS_SYSRET64 paravirt call
35Monitor
CVE-2021-4731383 days apartcpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init
33Monitor
CVE-2024-38616112 days apartwifi: carl9170: re-fix fortified-memset warning
32Monitor
CVE-2021-470100 days apartnet: Only allow init netns to set default tcp cong to a restricted algo
31Monitor
CVE-2023-526027 days apartjfs: fix slab-out-of-bounds Read in dtSearch
31Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-0145 · Feb 29, 2024(Linux Kernel Güncellemesi)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

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

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

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

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

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

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

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

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

References

git.kernel.org/stable/c/0ce6052802be2cb61a57b753e41301339c88c839

Show all references (3 more)

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

All records