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NVD / CVE Program· CNA Linux

CVE-2024-56739: rtc: check if __rtc_read_time was successful in rtc_timer_do_work()

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: 0.23% (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 0d68e8514d9040108ff7d1b37ca71096674b6efe, 246f621d363988e7040f4546d20203dc713fa3e1, 39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3f; azl3 kernel 6.6.57.1-7 on Azure Linux 3.0 6.6.64.2-1; azl3 kernel 6.6.64.2-1 on Azure Linux 3.0 6.6.64.2-1.

Low priority for now. Upgrade to Linux Linux 0d68e8514d9040108ff7d1b37ca71096674b6efe, 246f621d363988e7040f4546d20203dc713fa3e1, 39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3f; azl3 kernel 6.6.57.1-7 on Azure Linux 3.0 6.6.64.2-1; azl3 kernel 6.6.64.2-1 on Azure Linux 3.0 6.6.64.2-1 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: rtc: check if __rtc_read_time was successful in rtc_timer_do_work() If the __rtc_read_time call fails,, the struct rtc_time tm; may contain uninitialized data, or an illegal date/time read from the RTC hardware. When calling rtc_tm_to_ktime later, the result may be a very large value (possibly KTIME_MAX). If there are periodic timers in rtc->timerqueue, they will continually expire, may causing kernel softlockup.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Dec 29, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 14th 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-2024-56739

When you'll hear from us

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  • when exploit code appears or is weaponized
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  • 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 kernel2.6.38 and later · before 4.19.325
  • linux linux kernel4.20 and later · before 5.4.287
  • linux linux kernel5.5 and later · before 5.10.231
  • linux linux kernel5.11 and later · before 5.15.174
  • linux linux kernel5.16 and later · before 6.1.120
  • linux linux kernel6.2 and later · before 6.6.64
  • linux linux kernel6.7 and later · before 6.11.11
  • linux linux kernel6.12 and later · before 6.12.2

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

    • 2.6.38affected
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before 39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3faffected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before 44b3257ff705d63d5f00ef8ed314a0eeb7ec37f2affected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before 0d68e8514d9040108ff7d1b37ca71096674b6efeaffected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before 246f621d363988e7040f4546d20203dc713fa3e1affected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before fde56535505dde3336df438e949ef4742b6d6d6eaffected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before dd4b1cbcc916fad5d10c2662b62def9f05e453d4affected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before a1f0b4af90cc18b10261ecde56c6a56b22c75bd1affected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before e77bce0a8c3989b4173c36f4195122bca8f4a3e1affected · git
    • 6610e0893b8bc6f59b14fed7f089c5997f035f88 and later · before e8ba8a2bc4f60a1065f23d6a0e7cbea945a0f40daffected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.123-16.1.123-1
Debian:13linuxbefore 6.12.3-16.12.3-1

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-2024-56728Dec 29, 2024 · octeontx2-pf: handle otx2_mbox_get_rsp errors in otx2_ethtool.c
    22Monitor
  • ← EarlierCVE-2024-56730Dec 29, 2024 · net/9p/usbg: fix handling of the failed kzalloc() memory allocation
    22Monitor
  • Later →CVE-2024-56740Dec 29, 2024 · nfs/localio: must clear res.replen in nfs_local_read_done
    31Monitor

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 Linux0d68e8514d9040108ff7d1b37ca71096674b6efeVendor (CNA)
Linux Linux246f621d363988e7040f4546d20203dc713fa3e1Vendor (CNA)
Linux Linux39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3fVendor (CNA)
Linux Linux44b3257ff705d63d5f00ef8ed314a0eeb7ec37f2Vendor (CNA)
Linux Linuxa1f0b4af90cc18b10261ecde56c6a56b22c75bd1Vendor (CNA)
Linux Linuxdd4b1cbcc916fad5d10c2662b62def9f05e453d4Vendor (CNA)
Linux Linuxe77bce0a8c3989b4173c36f4195122bca8f4a3e1Vendor (CNA)
Linux Linuxe8ba8a2bc4f60a1065f23d6a0e7cbea945a0f40dVendor (CNA)
Linux Linuxfde56535505dde3336df438e949ef4742b6d6d6eVendor (CNA)
azl3 kernel 6.6.57.1-7 on Azure Linux 3.06.6.64.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.64.2-1 on Azure Linux 3.06.6.64.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.173.1-2 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.173.1-2 on CBL-Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.176.3-1 on CBL Mariner 2.05.15.176.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.123-1 · 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-2024-5030240 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2024-4768569 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()
    36Monitor
  • CVE-2026-43139493 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()
    34Monitor
  • CVE-2026-43291495 days apartnet: nfc: nci: Fix parameter validation for packet data
    33Monitor
  • CVE-2024-5014352 days apartudf: fix uninit-value use in udf_get_fileshortad
    31Monitor
  • CVE-2024-36898213 days apartgpiolib: cdev: fix uninitialised kfifo
    31Monitor

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).

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-908 · Use of Uninitialized Resource

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 (10 more)

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

All records