CVE-2021-47428

MEDIUMNVD 5.55.5

Also known asEUVD-2021-34433 (ENISA EUVD) · GHSA-7457-jp56-wxrq (GitHub Security Advisories)Source: ENISA EUVD

5.5EG

EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).

Lower severity and no public exploit yet

CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

powerpc/64s: fix program check interrupt emergency stack path

Emergency stack path was jumping into a 3: label inside the __GEN_COMMON_BODY macro for the normal path after it had finished, rather than jumping over it. By a small miracle this is the correct place to build up a new interrupt frame with the existing stack pointer, so things basically worked okay with an added weird looking 700 trap frame on top (which had the wrong ->nip so it didn't decode bug messages either).

Fix this by avoiding using numeric labels when jumping over non-trivial macros.

Before:

LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 88 Comm: sh Not tainted 5.15.0-rc2-00034-ge057cdade6e5 #2637 NIP: 7265677368657265 LR: c00000000006c0c8 CTR: c0000000000097f0 REGS: c0000000fffb3a50 TRAP: 0700 Not tainted MSR: 9000000000021031 CR: 00000700 XER: 20040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006c964 c0000000fffb3cf0 c000000001513800 0000000000000000 GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299 GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8 GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001 GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8 GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158 GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300 GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80 NIP [7265677368657265] 0x7265677368657265 LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10 Call Trace: [c0000000fffb3cf0] [c00000000000bdac] soft_nmi_common+0x13c/0x1d0 (unreliable) --- interrupt: 700 at decrementer_common_virt+0xb8/0x230 NIP: c0000000000098b8 LR: c00000000006c0c8 CTR: c0000000000097f0 REGS: c0000000fffb3d60 TRAP: 0700 Not tainted MSR: 9000000000021031 CR: 22424282 XER: 20040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006c964 0000000000002400 c000000001513800 0000000000000000 GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299 GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8 GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001 GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8 GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158 GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300 GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80 NIP [c0000000000098b8] decrementer_common_virt+0xb8/0x230 LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10 --- interrupt: 700 Instruction dump: XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX ---[ end trace 6d28218e0cc3c949 ]---

After:

------------[ cut here ]------------ kernel BUG at arch/powerpc/kernel/exceptions-64s.S:491! Oops: Exception in kernel mode, sig: 5 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 88 Comm: login Not tainted 5.15.0-rc2-00034-ge057cdade6e5-dirty #2638 NIP: c0000000000098b8 LR: c00000000006bf04 CTR: c0000000000097f0 REGS: c0000000fffb3d60 TRAP: 0700 Not tainted MSR: 9000000000021031 CR: 24482227 XER: 00040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006bf04 0000000000002400 c000000001513800 c000000001271868 GPR04: 00000000100f0d29 0000000042000000 0000000000000007 0000000000000009 GPR08: 00000000100f0d29 0000000024482227 0000000000002710 c000000000181b3c GPR12: 9000000000009033 c0000000016b0000 00000000100f0d29 c000000005b22f00 GPR16: 00000000ffff0000 0000000000000001 0000000000000009 00000000100eed90 GPR20: 00000000100eed90 00000 ---truncated---

CVSS v3: 5.5
EG Score: 5.5MEDIUMmedium confidence
EG Risk: 25
EPSS PROB: 0.2%
EPSS %ILE: 12th
KEV: Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity: 5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood: 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation: None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority: SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 21, 2024

Last Modified

September 25, 2025

References (3)

CVE Programhttps://git.kernel.org/stable/c/3e607dc4df180b72a38e75030cb0f94d12808712Patch
CVE Programhttps://git.kernel.org/stable/c/411b38fe68ba20a8bbe724b0939762c3f16e16caPatch
CVE Programhttps://git.kernel.org/stable/c/c835b3d1d6362b4a4ebb192da7e7fd27a0a45d01Patch

Vendor Advisories for CVE-2021-47428(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

RHSA-2024:9315
Red Hat Product SecurityMedium
Red Hat Security Advisory: kernel security update

Patch Availability(1)

Vendor / Ecosystem	Fix (by version range) / Patch	Released	Source
redhat	kernel-0:5.14.0-503.11.1.el9_5	2024-11-12	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)

Debian:11(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	5.10.46-4, 5.10.46-5, 5.10.70-1, 5.10.70-1~bpo10+1	every version up to 5.10.84-1: fixed in 5.10.84-1	—

Debian:12(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	—	every version up to 5.14.12-1: fixed in 5.14.12-1	—

Debian:13(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	—	every version up to 5.14.12-1: fixed in 5.14.12-1	—

Debian:14(1)

Package	Vulnerable range	Fix by version range	Dependents
linux	—	every version up to 5.14.12-1: fixed in 5.14.12-1	—

Data Freshness Timeline

(refreshed 7× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 205 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 108 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

2026-11-01 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-31 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-30 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-29 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-28 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-27 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-26 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-25 18:18 UTCEG score recompute
2026-10-25 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-24 21:43 UTCEG score recompute
2026-10-24 21:43 UTCVendor advisory
2026-10-24 21:43 UTCGHSA enrichmentGHSA-7457-jp56-wxrq · GitHub CVSS 5.5
2026-10-24 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-23 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-22 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-21 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-20 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-19 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-10-18 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-18 08:49 UTCEG score recompute
2026-10-17 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-16 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-15 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-14 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-13 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile

Show 72 more

2026-10-12 19:05 UTCEG score recompute
2026-10-11 23:31 UTCEG score recompute
2026-10-10 23:52 UTCOSV refresh
2026-10-10 19:56 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-09 20:04 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-08 16:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-07 23:45 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-06 15:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-05 17:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-04 23:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-03 14:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-10-02 16:23 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-09-30 15:45 UTCEG score recompute
2026-09-30 15:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-09-29 15:15 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-09-28 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-09-26 15:54 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-09-26 00:21 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-09-24 14:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
2026-09-23 13:45 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-09-22 14:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-09-21 20:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-09-21 12:19 UTCOSV refresh
2026-09-20 20:13 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-09-19 15:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-09-18 19:24 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-09-17 19:23 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-09-16 14:05 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-15 03:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-12 14:57 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-11 14:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-11 09:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-08 21:57 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-07 15:58 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-06 13:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-05 15:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-04 13:57 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-04 05:03 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-02 14:09 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-09-02 09:44 UTCOSV refresh
2026-09-01 13:51 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-30 19:14 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-30 01:19 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-28 21:38 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-27 14:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-26 14:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-24 14:13 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-21 23:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-08-20 22:52 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-08-19 17:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-08-17 13:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-08-16 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-08-16 08:20 UTCOSV refresh
2026-08-16 02:11 UTCEPSS rescoreEPSS 0.2% · 13th percentile
2026-08-15 01:27 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-13 21:57 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-12 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-11 13:38 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-09 13:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-08 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-07 16:24 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-06 13:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-05 19:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-04 15:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-04 10:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-03 10:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-02 02:24 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-01 04:13 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-08-01 02:12 UTCOSV refresh
2026-07-30 16:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-07-30 01:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
2026-07-28 15:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile

Same vendor

10 shown

redhat:RHSA-2024:9315

Frequently asked(5)

What is CVE-2021-47428?

CVE-2021-47428 is a medium-severity vulnerability; its CVE record was published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: fix program check interrupt emergency stack path Emergency stack path was jumping into a 3: label inside the __GEN_COMMON_BODY macro for the normal path after it had finished, rather than jumping over it. By a small…

When was the CVE record for CVE-2021-47428 published?

The CVE record for CVE-2021-47428 was published on May 21, 2024. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 25, 2025; the record at its source may have been updated since.

Is CVE-2021-47428 actively exploited?

CVE-2021-47428 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).

What is the CVSS score of CVE-2021-47428?

CVE-2021-47428 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-47428?

A fix for CVE-2021-47428 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2021-47428 are linked in the Vendor Advisories panel on this page.

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CVE-2021-47428

📅 Published

🔄 Last Modified

🔗 References (3)

📣 Vendor Advisories for CVE-2021-47428(1)