NVD / CVE Program· CNA Linux

CVE-2021-47456: can: peak_pci: peak_pci_remove(): fix UAF

HighCVSS 8.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 33/100)

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: 0.23% (FIRST EPSS).
Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 0e5afdc2315b0737edcf55bede4ee1640d2d464d, 1248582e47a9f7ce0ecd156c39fc61f8b6aa3699, 1c616528ba4aeb1125a06b407572ab7b56acae38.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0e5afdc2315b0737edcf55bede4ee1640d2d464d, 1248582e47a9f7ce0ecd156c39fc61f8b6aa3699, 1c616528ba4aeb1125a06b407572ab7b56acae38 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: can: peak_pci: peak_pci_remove(): fix UAF When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF. Fix this by releasing 'dev' later. The following log reveals it: [ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537 [ 35.965513 ] Call Trace: [ 35.965718 ] dump_stack_lvl+0xa8/0xd1 [ 35.966028 ] print_address_description+0x87/0x3b0 [ 35.966420 ] kasan_report+0x172/0x1c0 [ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170 [ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967945 ] __asan_report_load8_noabort+0x14/0x20 [ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.968752 ] pci_device_remove+0xa9/0x250

Memory safety

Published: May 22, 2024
Updated: Jun 17, 2026
EPSS: 0.2% · 14th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 33 / 40 · 8.4 / 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.

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.

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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

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
- 3.4affected
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before 1c616528ba4aeb1125a06b407572ab7b56acae38affected · git
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before 447d44cd2f67a20b596ede3ca3cd67086dfd9ca9affected · git
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before 34914971bb3244db4ce2be44e9438a9b30c56250affected · git
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before adbda14730aacce41c0d3596415aa39ad63eafd9affected · git
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before 1248582e47a9f7ce0ecd156c39fc61f8b6aa3699affected · git
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before 28f28e4bc3a5e0051faa963f10b778ab38c1db69affected · git
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before 0e5afdc2315b0737edcf55bede4ee1640d2d464daffected · git
- e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd and later · before 949fe9b35570361bc6ee2652f89a0561b26eec98affected · git
- before 3.4not affected · semver

Affected versions · NVD (8)

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

linux linux kernel3.4 and later · before 4.4.290
linux linux kernel4.5 and later · before 4.9.288
linux linux kernel4.10 and later · before 4.14.253
linux linux kernel4.15 and later · before 4.19.214
linux linux kernel4.20 and later · before 5.4.156
linux linux kernel5.5 and later · before 5.10.76
linux linux kernel5.11 and later · before 5.14.15
linux linux kernel5.15

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	bpftool	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-abi-stablelists	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-core	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-cross-headers	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-core	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-devel	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-modules	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-debug-modules-extra	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-devel	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-doc	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-headers	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-modules	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-modules-extra	before 4.18.0-553.8.1.el8_10	4.18.0-553.8.1.el8_10
AlmaLinux:8	kernel-rt	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-core	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-core	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-devel	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-kvm	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-modules	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-debug-modules-extra	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10
AlmaLinux:8	kernel-rt-devel	before 4.18.0-553.8.1.rt7.349.el8_10	4.18.0-553.8.1.rt7.349.el8_10

+65

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-2021-47454May 22, 2024 · powerpc/smp: do not decrement idle task preempt count in CPU offline
22Monitor
← EarlierCVE-2021-47455May 22, 2024 · ptp: Fix possible memory leak in ptp_clock_register()
22Monitor
Later →CVE-2021-47457May 22, 2024 · can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible()
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	0e5afdc2315b0737edcf55bede4ee1640d2d464d	Vendor (CNA)
Linux Linux	1248582e47a9f7ce0ecd156c39fc61f8b6aa3699	Vendor (CNA)
Linux Linux	1c616528ba4aeb1125a06b407572ab7b56acae38	Vendor (CNA)
Linux Linux	28f28e4bc3a5e0051faa963f10b778ab38c1db69	Vendor (CNA)
Linux Linux	34914971bb3244db4ce2be44e9438a9b30c56250	Vendor (CNA)
Linux Linux	447d44cd2f67a20b596ede3ca3cd67086dfd9ca9	Vendor (CNA)
Linux Linux	949fe9b35570361bc6ee2652f89a0561b26eec98	Vendor (CNA)
Linux Linux	adbda14730aacce41c0d3596415aa39ad63eafd9	Vendor (CNA)
almalinux:bpftool	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-abi-stablelists	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-core	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-cross-headers	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-core	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-devel	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-modules	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-debug-modules-extra	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-devel	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-doc	4.18.0-553.8.1.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-core	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-core	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-devel	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-kvm	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-modules	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-devel	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)
almalinux:kernel-rt-kvm	4.18.0-553.8.1.rt7.349.el8_10 · AlmaLinux:8	Package registry (OSV)

+17

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.

National notice (Türkiye Cybersecurity Directorate / USOM)

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

TR-24-0527 · May 23, 2024(Linux Kernel Güncellemesi)

All national notices →

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

Technical details

Attack conditions

Someone with local access to the system 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: 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: None
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:N/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 (1)

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464d

Show all references (7 more)

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

All records