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NVD / CVE Program· CNA Linux

CVE-2023-52504: x86/alternatives: Disable KASAN in apply_alternatives()

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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 3719d3c36aa853d5a2401af9f8d6b116c91ad5ae, 3770c38cd6a60494da29ac2da73ff8156440a2d1, 5b784489c8158518bf7a466bb3cc045b0fb66b4b.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3719d3c36aa853d5a2401af9f8d6b116c91ad5ae, 3770c38cd6a60494da29ac2da73ff8156440a2d1, 5b784489c8158518bf7a466bb3cc045b0fb66b4b 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: x86/alternatives: Disable KASAN in apply_alternatives() Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine: BUG: KASAN: out-of-bounds in rcu_is_watching() Read of size 4 at addr ff110003ee6419a0 by task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled(). KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue. Fix it for real by disabling KASAN while the kernel is patching alternatives. [ mingo: updated the changelog ]

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Mar 2, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 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-2023-52504

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 kernel4.17 and later · before 4.19.297
  • linux linux kernel4.20 and later · before 5.4.270
  • linux linux kernel5.5 and later · before 5.10.199
  • linux linux kernel5.11 and later · before 5.15.136
  • linux linux kernel5.16 and later · before 6.1.59
  • linux linux kernel6.2 and later · before 6.5.8
  • linux linux kernel6.6

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

    • 4.17affected
    • 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 and later · before 3719d3c36aa853d5a2401af9f8d6b116c91ad5aeaffected · git
    • 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 and later · before 3770c38cd6a60494da29ac2da73ff8156440a2d1affected · git
    • 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 and later · before 6788b10620ca6e98575d1e06e72a8974aad7657eaffected · git
    • 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 and later · before ecba5afe86f30605eb9dfb7f265a8de0218d4cfcaffected · git
    • 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 and later · before 5b784489c8158518bf7a466bb3cc045b0fb66b4baffected · git
    • 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 and later · before cd287cc208dfe6bd6da98e7f88e723209242c9b4affected · git
    • 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 and later · before d35652a5fc9944784f6f50a5c979518ff8dacf61affected · git
    • before 4.17not affected · semver
    • 4.19.297 and later · up to and including 4.19.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.64-16.1.64-1
Debian:13linuxbefore 6.5.8-16.5.8-1

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-2023-52502Mar 2, 2024 · net: nfc: fix races in nfc_llcp_sock_get() and nfc_llcp_sock_get_sn()
    35Monitor
  • ← EarlierCVE-2023-52503Mar 2, 2024 · tee: amdtee: fix use-after-free vulnerability in amdtee_close_session
    28Monitor
  • Later →CVE-2023-52505Mar 2, 2024 · phy: lynx-28g: serialize concurrent phy_set_mode_ext() calls to shared registers
    18Monitor

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 Linux3719d3c36aa853d5a2401af9f8d6b116c91ad5aeVendor (CNA)
Linux Linux3770c38cd6a60494da29ac2da73ff8156440a2d1Vendor (CNA)
Linux Linux5b784489c8158518bf7a466bb3cc045b0fb66b4bVendor (CNA)
Linux Linux6788b10620ca6e98575d1e06e72a8974aad7657eVendor (CNA)
Linux Linuxcd287cc208dfe6bd6da98e7f88e723209242c9b4Vendor (CNA)
Linux Linuxd35652a5fc9944784f6f50a5c979518ff8dacf61Vendor (CNA)
Linux Linuxecba5afe86f30605eb9dfb7f265a8de0218d4cfcVendor (CNA)
debian:linux6.1.64-1 · 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).

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
high · data can be read
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
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

ATT&CK techniques

—

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