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NVD / CVE Program· CNA Linux

CVE-2023-53474: x86/MCE/AMD: Use an u64 for bank_map

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: 0.16% (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 11c58a0c1937c157dbdf82d5ab634d68c99f3098, 4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156, 67bb7521b6420d81dab7538c0686f18f7d6d09f4.
  • Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 11c58a0c1937c157dbdf82d5ab634d68c99f3098, 4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156, 67bb7521b6420d81dab7538c0686f18f7d6d09f4 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/MCE/AMD: Use an u64 for bank_map Thee maximum number of MCA banks is 64 (MAX_NR_BANKS), see a0bc32b3cacf ("x86/mce: Increase maximum number of banks to 64"). However, the bank_map which contains a bitfield of which banks to initialize is of type unsigned int and that overflows when those bit numbers are >= 32, leading to UBSAN complaining correctly: UBSAN: shift-out-of-bounds in arch/x86/kernel/cpu/mce/amd.c:1365:38 shift exponent 32 is too large for 32-bit type 'int' Change the bank_map to a u64 and use the proper BIT_ULL() macro when modifying bits in there. [ bp: Rewrite commit message. ]

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 1, 2025
Updated
Oct 15, 2026
EPSS
0.1% · 6th 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 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
7.8
2.3 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-2023-53474

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 kernel5.10 and later · before 5.10.180
  • linux linux kernel5.11 and later · before 5.15.111
  • linux linux kernel5.16 and later · before 6.1.28
  • linux linux kernel6.2 and later · before 6.2.15
  • linux linux kernel6.3 and later · before 6.3.2

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

    • 5.10affected
    • a0bc32b3cacf194dc479b342f006203fd1e1941a and later · before a9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83affected · git
    • a0bc32b3cacf194dc479b342f006203fd1e1941a and later · before 11c58a0c1937c157dbdf82d5ab634d68c99f3098affected · git
    • a0bc32b3cacf194dc479b342f006203fd1e1941a and later · before ba8ffb1251eb629c2ec35220e3896cf4f7b888a7affected · git
    • a0bc32b3cacf194dc479b342f006203fd1e1941a and later · before 9669fa17287c3af2bbd4868d4c8fdd9e57f8332eaffected · git
    • a0bc32b3cacf194dc479b342f006203fd1e1941a and later · before 67bb7521b6420d81dab7538c0686f18f7d6d09f4affected · git
    • a0bc32b3cacf194dc479b342f006203fd1e1941a and later · before 4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156affected · git
    • before 5.10not affected · semver
    • 5.10.180 and later · up to and including 5.10.*not affected · semver
    • 5.15.111 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.37-16.1.37-1
Debian:13linuxbefore 6.3.7-16.3.7-1

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-2023-53470Oct 1, 2025 · ionic: catch failure from devlink_alloc
    22Monitor
  • ← EarlierCVE-2023-53473Oct 1, 2025 · ext4: improve error handling from ext4_dirhash()
    31Monitor
  • Later →CVE-2023-53475Oct 1, 2025 · usb: xhci: tegra: fix sleep in atomic call
    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 Linux11c58a0c1937c157dbdf82d5ab634d68c99f3098Vendor (CNA)
Linux Linux4c1cdec319b9aadb65737c3eb1f5cb74bd6aa156Vendor (CNA)
Linux Linux67bb7521b6420d81dab7538c0686f18f7d6d09f4Vendor (CNA)
Linux Linux9669fa17287c3af2bbd4868d4c8fdd9e57f8332eVendor (CNA)
Linux Linuxa9b9ea0e63a0ec5e97bf1219ab6dcbd55e362f83Vendor (CNA)
Linux Linuxba8ffb1251eb629c2ec35220e3896cf4f7b888a7Vendor (CNA)
debian:linux6.1.37-1 · 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-2026-31633205 days apartrxrpc: Fix integer overflow in rxgk_verify_response()
    39Monitor
  • CVE-2026-31649205 days apartnet: stmmac: fix integer underflow in chain mode
    39Monitor
  • CVE-2026-31659205 days apartbatman-adv: reject oversized global TT response buffers
    39Monitor
  • CVE-2026-43341219 days apartnet/ipv6: ioam6: prevent schema length wraparound in trace fill
    39Monitor
  • CVE-2026-46039238 days apartrxgk: Fix potential integer overflow in length check
    39Monitor
  • CVE-2026-46325251 days apartRDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGE_SIZE
    39Monitor

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-190 · Integer Overflow or Wraparound

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.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

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

All records