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CVE-2021-47478· NVD / CVE Program· CNA Linux

isofs: Fix out of bound access for corrupted isofs image

In the Linux kernel, the following vulnerability has been resolved: isofs: Fix out of bound access for corrupted isofs image When isofs image is suitably corrupted isofs_read_inode() can read data beyond the end of buffer. Sanity-check the directory entry length before using it.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
May 22, 2024
Updated
Aug 5, 2026
EPSS
0.7% · 51th percentile
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Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

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Affected systems

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 kernelbefore 4.4.292
  • linux linux kernel4.5 and later · before 4.9.290
  • linux linux kernel4.10 and later · before 4.14.255
  • linux linux kernel4.15 and later · before 4.19.217
  • linux linux kernel4.20 and later · before 5.4.159
  • linux linux kernel5.5 and later · before 5.10.79
  • linux linux kernel5.11 and later · before 5.14.18
  • linux linux kernel5.15 and later · before 5.15.2

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 156ce5bb6cc43a80a743810199defb1dc3f55b7faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9ec33a9b8790c212cc926a88c5e2105f97f3f57eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before afbd40f425227e661d991757e11cc4db024e761faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before b0ddff8d68f2e43857a84dce54c3deab181c8ae1affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6e80e9314f8bb52d9eabe1907698718ff01120f5affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 86d4aedcbc69c0f84551fb70f953c24e396de2d7affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before b2fa1f52d22c5455217b294629346ad23a744945affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e7fb722586a2936b37bdff096c095c30ca06404daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e96a1866b40570b5950cda8602c2819189c62a48affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.15.3-15.15.3-1

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
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
    77This week
  • CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV
    77This week
  • CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV
    77This week

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 Linux156ce5bb6cc43a80a743810199defb1dc3f55b7fVendor (CNA)
Linux Linux6e80e9314f8bb52d9eabe1907698718ff01120f5Vendor (CNA)
Linux Linux86d4aedcbc69c0f84551fb70f953c24e396de2d7Vendor (CNA)
Linux Linux9ec33a9b8790c212cc926a88c5e2105f97f3f57eVendor (CNA)
Linux Linuxafbd40f425227e661d991757e11cc4db024e761fVendor (CNA)
Linux Linuxb0ddff8d68f2e43857a84dce54c3deab181c8ae1Vendor (CNA)
Linux Linuxb2fa1f52d22c5455217b294629346ad23a744945Vendor (CNA)
Linux Linuxe7fb722586a2936b37bdff096c095c30ca06404dVendor (CNA)
Linux Linuxe96a1866b40570b5950cda8602c2819189c62a48Vendor (CNA)
debian:linux5.15.3-1 · 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.

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.

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
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:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

nvd-secondary

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

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

All records