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NVD / CVE Program· CNA Linux

CVE-2023-52646: aio: fix mremap after fork null-deref

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 178993157e8c50aef7f35d7d6d3b44bb428199e1, 4326d0080f7e84fba775da41d158f46cf9d3f1c2, 808f1e4b5723ae4eda724d2ad6f6638905eefd95.

Low priority for now. Upgrade to Linux Linux 178993157e8c50aef7f35d7d6d3b44bb428199e1, 4326d0080f7e84fba775da41d158f46cf9d3f1c2, 808f1e4b5723ae4eda724d2ad6f6638905eefd95 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: aio: fix mremap after fork null-deref Commit e4a0d3e720e7 ("aio: Make it possible to remap aio ring") introduced a null-deref if mremap is called on an old aio mapping after fork as mm->ioctx_table will be set to NULL. [jmoyer@redhat.com: fix 80 column issue]

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 26, 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-2023-52646

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 kernel3.19 and later · before 4.14.306
  • linux linux kernel4.15 and later · before 4.19.273
  • linux linux kernel4.20 and later · before 5.4.232
  • linux linux kernel5.5 and later · before 5.10.169
  • linux linux kernel5.11 and later · before 5.15.95
  • linux linux kernel5.16 and later · before 6.1.13
  • linux linux kernel6.2

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

    • 3.19affected
    • e4a0d3e720e7e508749c1439b5ba3aff56c92976 and later · before 808f1e4b5723ae4eda724d2ad6f6638905eefd95affected · git
    • e4a0d3e720e7e508749c1439b5ba3aff56c92976 and later · before d8dca1bfe9adcae38b35add64977818c0c13dd22affected · git
    • e4a0d3e720e7e508749c1439b5ba3aff56c92976 and later · before 4326d0080f7e84fba775da41d158f46cf9d3f1c2affected · git
    • e4a0d3e720e7e508749c1439b5ba3aff56c92976 and later · before c261f798f7baa8080cf0214081d43d5f86bb073faffected · git
    • e4a0d3e720e7e508749c1439b5ba3aff56c92976 and later · before 178993157e8c50aef7f35d7d6d3b44bb428199e1affected · git
    • e4a0d3e720e7e508749c1439b5ba3aff56c92976 and later · before af126acf01a12bdb04986fd26fc2eb3b40249e0daffected · git
    • e4a0d3e720e7e508749c1439b5ba3aff56c92976 and later · before 81e9d6f8647650a7bead74c5f926e29970e834d1affected · git
    • before 3.19not affected · semver
    • 4.14.306 and later · up to and including 4.14.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.15-16.1.15-1

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-2024-26923Apr 25, 2024 · af_unix: Fix garbage collector racing against connect()
    18Monitor
  • ← EarlierCVE-2024-26925Apr 25, 2024 · netfilter: nf_tables: release mutex after nft_gc_seq_end from abort path
    22Monitor
  • Later →CVE-2024-26927Apr 28, 2024 · ASoC: SOF: Add some bounds checking to firmware data
    33Monitor

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 Linux178993157e8c50aef7f35d7d6d3b44bb428199e1Vendor (CNA)
Linux Linux4326d0080f7e84fba775da41d158f46cf9d3f1c2Vendor (CNA)
Linux Linux808f1e4b5723ae4eda724d2ad6f6638905eefd95Vendor (CNA)
Linux Linux81e9d6f8647650a7bead74c5f926e29970e834d1Vendor (CNA)
Linux Linuxaf126acf01a12bdb04986fd26fc2eb3b40249e0dVendor (CNA)
Linux Linuxc261f798f7baa8080cf0214081d43d5f86bb073fVendor (CNA)
Linux Linuxd8dca1bfe9adcae38b35add64977818c0c13dd22Vendor (CNA)
debian:linux6.1.15-1 · 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.

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).

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-476 · NULL Pointer Dereference

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 (6 more)

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

All records