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NVD / CVE Program· CNA Linux

CVE-2024-26840: cachefiles: fix memory leak in cachefiles_add_cache()

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: 0.27% (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 037d5a949b0455540ef9aab34c10ddf54b65d285, 38e921616320d159336b0ffadb09e9fb4945c7c3, 43eccc5823732ba6daab2511ed32dfc545a666d8.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 037d5a949b0455540ef9aab34c10ddf54b65d285, 38e921616320d159336b0ffadb09e9fb4945c7c3, 43eccc5823732ba6daab2511ed32dfc545a666d8 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: cachefiles: fix memory leak in cachefiles_add_cache() The following memory leak was reported after unbinding /dev/cachefiles: ================================================================== unreferenced object 0xffff9b674176e3c0 (size 192): comm "cachefilesd2", pid 680, jiffies 4294881224 hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc ea38a44b): [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370 [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0 [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120 [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0 [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0 [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520 [<ffffffff8ebc5069>] ksys_write+0x69/0xf0 [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140 [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76 ================================================================== Put the reference count of cache_cred in cachefiles_daemon_unbind() to fix the problem. And also put cache_cred in cachefiles_add_cache() error branch to avoid memory leaks.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 17, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 20th 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.

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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 kernel2.6.30 and later · before 4.19.309
  • linux linux kernel4.20 and later · before 5.4.271
  • linux linux kernel5.5 and later · before 5.10.212
  • linux linux kernel5.11 and later · before 5.15.151
  • linux linux kernel5.16 and later · before 6.1.80
  • linux linux kernel6.2 and later · before 6.6.19
  • linux linux kernel6.7 and later · before 6.7.7
  • linux linux kernel6.8

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

    • 2.6.30affected
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before cb5466783793e66272624cf71925ae1d1ba32083affected · git
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before 037d5a949b0455540ef9aab34c10ddf54b65d285affected · git
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before 43eccc5823732ba6daab2511ed32dfc545a666d8affected · git
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before 94965be37add0983672e48ecb33cdbda92b62579affected · git
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before 8b218e2f0a27a9f09428b1847b4580640b9d1e58affected · git
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before 38e921616320d159336b0ffadb09e9fb4945c7c3affected · git
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before 9cac69912052a4def571fedf1cb9bb4ec590e25aaffected · git
    • 9ae326a69004dea8af2dae4fde58de27db700a8d and later · before e21a2f17566cbd64926fb8f16323972f7a064444affected · git
    • before 2.6.30not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.82-16.1.82-1
Debian:13linuxbefore 6.7.7-16.7.7-1
Red Hat:rhel_eus:9.4::appstreambpftool-debuginfobefore 0:7.3.0-427.68.1.el9_40:7.3.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-debug-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-debug-develbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-debug-devel-matchedbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-develbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-64k-devel-matchedbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debug-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debug-develbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debug-devel-matchedbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debuginfo-common-aarch64before 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debuginfo-common-ppc64lebefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debuginfo-common-s390xbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-debuginfo-common-x86_64before 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-develbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-devel-matchedbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-docbefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-rt-debug-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-rt-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-tools-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4
Red Hat:rhel_eus:9.4::appstreamkernel-zfcpdump-debuginfobefore 0:5.14.0-427.68.1.el9_40:5.14.0-427.68.1.el9_4

+56

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-2024-26838Apr 17, 2024 · RDMA/irdma: Fix KASAN issue with tasklet
    22Monitor
  • ← EarlierCVE-2024-26839Apr 17, 2024 · IB/hfi1: Fix a memleak in init_credit_return
    22Monitor
  • Later →CVE-2024-26842Apr 17, 2024 · scsi: ufs: core: Fix shift issue in ufshcd_clear_cmd()
    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 Linux037d5a949b0455540ef9aab34c10ddf54b65d285Vendor (CNA)
Linux Linux38e921616320d159336b0ffadb09e9fb4945c7c3Vendor (CNA)
Linux Linux43eccc5823732ba6daab2511ed32dfc545a666d8Vendor (CNA)
Linux Linux8b218e2f0a27a9f09428b1847b4580640b9d1e58Vendor (CNA)
Linux Linux94965be37add0983672e48ecb33cdbda92b62579Vendor (CNA)
Linux Linux9cac69912052a4def571fedf1cb9bb4ec590e25aVendor (CNA)
Linux Linuxcb5466783793e66272624cf71925ae1d1ba32083Vendor (CNA)
Linux Linuxe21a2f17566cbd64926fb8f16323972f7a064444Vendor (CNA)
debian:linux6.1.82-1 · Debian:12Package registry (OSV)
red hat:bpftool-debuginfo0:7.3.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-427.68.1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage 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).

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-401 · Missing Release of Memory after Effective Lifetime

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 (9 more)

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

All records