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NVD / CVE Program· CNA Linux

CVE-2024-43893: serial: core: check uartclk for zero to avoid divide by zero

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: 0.25% (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 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba, 52b138f1021113e593ee6ad258ce08fe90693a9e, 55b2a5d331a6ceb1c4372945fdb77181265ba24f.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bba, 52b138f1021113e593ee6ad258ce08fe90693a9e, 55b2a5d331a6ceb1c4372945fdb77181265ba24f 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: serial: core: check uartclk for zero to avoid divide by zero Calling ioctl TIOCSSERIAL with an invalid baud_base can result in uartclk being zero, which will result in a divide by zero error in uart_get_divisor(). The check for uartclk being zero in uart_set_info() needs to be done before other settings are made as subsequent calls to ioctl TIOCSSERIAL for the same port would be impacted if the uartclk check was done where uartclk gets set. Oops: divide error: 0000 PREEMPT SMP KASAN PTI RIP: 0010:uart_get_divisor (drivers/tty/serial/serial_core.c:580) Call Trace: <TASK> serial8250_get_divisor (drivers/tty/serial/8250/8250_port.c:2576 drivers/tty/serial/8250/8250_port.c:2589) serial8250_do_set_termios (drivers/tty/serial/8250/8250_port.c:502 drivers/tty/serial/8250/8250_port.c:2741) serial8250_set_termios (drivers/tty/serial/8250/8250_port.c:2862) uart_change_line_settings (./include/linux/spinlock.h:376 ./include/linux/serial_core.h:608 drivers/tty/serial/serial_core.c:222) uart_port_startup (drivers/tty/serial/serial_core.c:342) uart_startup (drivers/tty/serial/serial_core.c:368) uart_set_info (drivers/tty/serial/serial_core.c:1034) uart_set_info_user (drivers/tty/serial/serial_core.c:1059) tty_set_serial (drivers/tty/tty_io.c:2637) tty_ioctl (drivers/tty/tty_io.c:2647 drivers/tty/tty_io.c:2791) __x64_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:907 fs/ioctl.c:893 fs/ioctl.c:893) do_syscall_64 (arch/x86/entry/common.c:52 (discriminator 1) arch/x86/entry/common.c:83 (discriminator 1)) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Rule: add

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Aug 26, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 17th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
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.

Follow CVE-2024-43893

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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 kernelbefore 4.19.320
  • linux linux kernel4.20 and later · before 5.4.282
  • linux linux kernel5.5 and later · before 5.10.224
  • linux linux kernel5.11 and later · before 5.15.165
  • linux linux kernel5.16 and later · before 6.1.105
  • linux linux kernel6.2 and later · before 6.6.46
  • linux linux kernel6.7 and later · before 6.10.5
  • linux linux kernel6.11

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bbaaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 55b2a5d331a6ceb1c4372945fdb77181265ba24faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 52b138f1021113e593ee6ad258ce08fe90693a9eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9196e42a3b8eeff1707e6ef769112b4b6096be49affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e13ba3fe5ee070f8a9dab60029d52b1f61da5051affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e3ad503876283ac3fcca922a1bf243ef9eb0b0e2affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 68dc02f319b9ee54dc23caba742a5c754d1cccc8affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6eabce6608d6f3440f4c03aa3d3ef50a47a3d193affected · git
    • before 2.6.12not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.106-16.1.106-1
Debian:13linuxbefore 6.10.6-16.10.6-1

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-2024-43889Aug 26, 2024 · padata: Fix possible divide-by-0 panic in padata_mt_helper()
    22Monitor
  • ← EarlierCVE-2024-43890Aug 26, 2024 · tracing: Fix overflow in get_free_elt()
    22Monitor
  • Later →CVE-2024-43899Aug 26, 2024 · drm/amd/display: Fix null pointer deref in dcn20_resource.c
    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 / packageFixed versionSource
Linux Linux3bbd90fca824e6fd61fb20f6dd2b0fa5f8b14bbaVendor (CNA)
Linux Linux52b138f1021113e593ee6ad258ce08fe90693a9eVendor (CNA)
Linux Linux55b2a5d331a6ceb1c4372945fdb77181265ba24fVendor (CNA)
Linux Linux68dc02f319b9ee54dc23caba742a5c754d1cccc8Vendor (CNA)
Linux Linux6eabce6608d6f3440f4c03aa3d3ef50a47a3d193Vendor (CNA)
Linux Linux9196e42a3b8eeff1707e6ef769112b4b6096be49Vendor (CNA)
Linux Linuxe13ba3fe5ee070f8a9dab60029d52b1f61da5051Vendor (CNA)
Linux Linuxe3ad503876283ac3fcca922a1bf243ef9eb0b0e2Vendor (CNA)
debian:linux6.1.106-1 · Debian:12Package 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.

  • CVE-2024-26945117 days apartcrypto: iaa - Fix nr_cpus < nr_iaa case
    33Monitor
  • CVE-2024-438890 days apartpadata: Fix possible divide-by-0 panic in padata_mt_helper()
    22Monitor
  • CVE-2024-423169 days apartmm/mglru: fix div-by-zero in vmpressure_calc_level()
    22Monitor
  • CVE-2024-4667618 days apartnfc: pn533: Add poll mod list filling check
    22Monitor
  • CVE-2024-4673223 days apartdrm/amd/display: Assign linear_pitch_alignment even for VM
    22Monitor
  • CVE-2024-4677223 days apartdrm/amd/display: Check denominator crb_pipes before used
    22Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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-369 · Divide By Zero

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 (12 more)

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

All records