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NVD / CVE Program· CNA Linux

CVE-2024-43845: udf: Fix bogus checksum computation in udf_rename()

Noroxi assessment

Priority: Monitor (action score 13/100)

  • 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: 0.22% (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 27ab33854873e6fb958cb074681a0107cc2ecc4c, 40d7b3ed52449d36143bab8d3e70926aa61a60f4, 9c439311c13fc6faab1921441165c9b8b500c83b.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 3.3.

Low priority for now. Upgrade to Linux Linux 27ab33854873e6fb958cb074681a0107cc2ecc4c, 40d7b3ed52449d36143bab8d3e70926aa61a60f4, 9c439311c13fc6faab1921441165c9b8b500c83b 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: udf: Fix bogus checksum computation in udf_rename() Syzbot reports uninitialized memory access in udf_rename() when updating checksum of '..' directory entry of a moved directory. This is indeed true as we pass on-stack diriter.fi to the udf_update_tag() and because that has only struct fileIdentDesc included in it and not the impUse or name fields, the checksumming function is going to checksum random stack contents beyond the end of the structure. This is actually harmless because the following udf_fiiter_write_fi() will recompute the checksum from on-disk buffers where everything is properly included. So all that is needed is just removing the bogus calculation.

LowCVSS 3.3 · v3.1—No exploit Fix available
Published
Aug 17, 2024
Updated
Aug 5, 2026
EPSS
0.2% · 12th percentile

Report tools

JSON

Action score

13

Monitor

Low priority for now.

CVSS
13 / 40 · 3.3 / 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.

CNA vs NVD score

NVD
3.3
CNA · Linux
7.8
4.5 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.

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-2024-43845

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 kernel6.3 and later · before 6.6.44
  • linux linux kernel6.7 and later · before 6.10.3

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

    • 6.3affected
    • 626860c470ff88e5f7f22a282efd1bfe953a1b54 and later · before 9c439311c13fc6faab1921441165c9b8b500c83baffected · git
    • e9109a92d2a95889498bed3719cd2318892171a2 and later · before fe2ead240c31e8d158713beca9d0681a6e6a53abaffected · git
    • e9109a92d2a95889498bed3719cd2318892171a2 and later · before 40d7b3ed52449d36143bab8d3e70926aa61a60f4affected · git
    • e9109a92d2a95889498bed3719cd2318892171a2 and later · before 27ab33854873e6fb958cb074681a0107cc2ecc4caffected · git
    • before 6.3not affected · semver
    • 6.6.44 and later · up to and including 6.6.*not affected · semver
    • 6.10.3 and later · up to and including 6.10.*not affected · semver
    • 6.11 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.10.3-16.10.3-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-43843Aug 17, 2024 · riscv, bpf: Fix out-of-bounds issue when preparing trampoline image
    31Monitor
  • ← EarlierCVE-2024-43844Aug 17, 2024 · wifi: rtw89: wow: fix GTK offload H2C skbuff issue
    22Monitor
  • Later →CVE-2024-43846Aug 17, 2024 · lib: objagg: Fix general protection fault
    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 Linux27ab33854873e6fb958cb074681a0107cc2ecc4cVendor (CNA)
Linux Linux40d7b3ed52449d36143bab8d3e70926aa61a60f4Vendor (CNA)
Linux Linux9c439311c13fc6faab1921441165c9b8b500c83bVendor (CNA)
Linux Linuxfe2ead240c31e8d158713beca9d0681a6e6a53abVendor (CNA)
debian:linux6.10.3-1 · Debian:13Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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-2024-5030294 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2024-4768565 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()
    36Monitor
  • CVE-2024-3689879 days apartgpiolib: cdev: fix uninitialised kfifo
    31Monitor
  • CVE-2024-5014382 days apartudf: fix uninit-value use in udf_get_fileshortad
    31Monitor
  • CVE-2021-4755385 days apartsched/scs: Reset task stack state in bringup_cpu()
    31Monitor
  • CVE-2024-27022108 days apartfork: defer linking file vma until vma is fully initialized
    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
low · data or configuration can be modified
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

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:L/A:N

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 (3 more)

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

All records