NVD / CVE Program· CNA Linux

CVE-2024-42253: gpio: pca953x: fix pca953x_irq_bus_sync_unlock race

Noroxi assessment

Priority: Monitor (action score 18/100)

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: 0.17% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
Fixed version: Linux Linux 58a5c93bd1a6e949267400080f07e57ffe05ec34, bfc6444b57dc7186b6acc964705d7516cbaf3904, de7cffa53149c7b48bd1bb29b02390c9f05b7f41.
Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 4.7.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 58a5c93bd1a6e949267400080f07e57ffe05ec34, bfc6444b57dc7186b6acc964705d7516cbaf3904, de7cffa53149c7b48bd1bb29b02390c9f05b7f41 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: gpio: pca953x: fix pca953x_irq_bus_sync_unlock race Ensure that `i2c_lock' is held when setting interrupt latch and mask in pca953x_irq_bus_sync_unlock() in order to avoid races. The other (non-probe) call site pca953x_gpio_set_multiple() ensures the lock is held before calling pca953x_write_regs(). The problem occurred when a request raced against irq_bus_sync_unlock() approximately once per thousand reboots on an i.MX8MP based system. * Normal case 0-0022: write register AI|3a {03,02,00,00,01} Input latch P0 0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0 0-0022: write register AI|08 {ff,00,00,00,00} Output P3 0-0022: write register AI|12 {fc,00,00,00,00} Config P3 * Race case 0-0022: write register AI|08 {ff,00,00,00,00} Output P3 0-0022: write register AI|08 {03,02,00,00,01} *** Wrong register *** 0-0022: write register AI|12 {fc,00,00,00,00} Config P3 0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0

MediumCVSS 4.7 · v3.1—No exploit Fix available

Denial of service

BDU:2024-08183

Published: Aug 8, 2024
Updated: Aug 5, 2026
EPSS: 0.1% · 6th percentile
CWE: CWE-667

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 18 / 40 · 4.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 4.7
CNA · Linux: 7.8; 3.1 point gap

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

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?

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

Affected versions

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

linux linux kernelbefore 6.1.101
linux linux kernel6.2 and later · before 6.6.42
linux linux kernel6.7 and later · before 6.9.11
linux linux kernel6.10

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
- 4.7affected
- 44896beae605b93f2232301befccb7ef42953198 and later · before 58a5c93bd1a6e949267400080f07e57ffe05ec34affected · git
- 44896beae605b93f2232301befccb7ef42953198 and later · before e2ecdddca80dd845df42376e4b0197fe97018ba2affected · git
- 44896beae605b93f2232301befccb7ef42953198 and later · before de7cffa53149c7b48bd1bb29b02390c9f05b7f41affected · git
- 44896beae605b93f2232301befccb7ef42953198 and later · before bfc6444b57dc7186b6acc964705d7516cbaf3904affected · git
- before 4.7not affected · semver
- 6.1.101 and later · up to and including 6.1.*not affected · semver
- 6.6.42 and later · up to and including 6.6.*not affected · semver
- 6.9.11 and later · up to and including 6.9.*not affected · semver
- 6.10 and laternot affected · original_commit_for_fix

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 6.1.106-1	6.1.106-1
Debian:13	linux	before 6.9.11-1	6.9.11-1

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-2024-42251Aug 8, 2024 · mm: page_ref: remove folio_try_get_rcu()
22Monitor
← EarlierCVE-2024-42252Aug 8, 2024 · closures: Change BUG_ON() to WARN_ON()
22Monitor
Later →CVE-2024-42254Aug 8, 2024 · io_uring: fix error pbuf checking
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	58a5c93bd1a6e949267400080f07e57ffe05ec34	Vendor (CNA)
Linux Linux	bfc6444b57dc7186b6acc964705d7516cbaf3904	Vendor (CNA)
Linux Linux	de7cffa53149c7b48bd1bb29b02390c9f05b7f41	Vendor (CNA)
Linux Linux	e2ecdddca80dd845df42376e4b0197fe97018ba2	Vendor (CNA)
debian:linux	6.1.106-1 · 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).