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NVD / CVE Program· CNA Linux

CVE-2024-26955: nilfs2: prevent kernel bug at submit_bh_wbc()

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.25% (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 0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44c, 192e9f9078c96be30b31c4b44d6294b24520fce5, 269cdf353b5bdd15f1a079671b0f889113865f20.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44c, 192e9f9078c96be30b31c4b44d6294b24520fce5, 269cdf353b5bdd15f1a079671b0f889113865f20 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: nilfs2: prevent kernel bug at submit_bh_wbc() Fix a bug where nilfs_get_block() returns a successful status when searching and inserting the specified block both fail inconsistently. If this inconsistent behavior is not due to a previously fixed bug, then an unexpected race is occurring, so return a temporary error -EAGAIN instead. This prevents callers such as __block_write_begin_int() from requesting a read into a buffer that is not mapped, which would cause the BUG_ON check for the BH_Mapped flag in submit_bh_wbc() to fail.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 1, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 17th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 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-2024-26955

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
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • linux linux kernel4.20 and later · before 5.4.274
  • linux linux kernel5.5 and later · before 5.10.215
  • linux linux kernel5.11 and later · before 5.15.154
  • linux linux kernel2.6.30 and later · before 4.19.312
  • linux linux kernel6.2 and later · before 6.6.24
  • linux linux kernel6.7 and later · before 6.7.12
  • linux linux kernel6.8 and later · before 6.8.3
  • linux linux kernel5.16 and later · before 6.1.84

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
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before 91e4c4595fae5e87069e44687ae879091783c183affected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before 32eaee72e96590a75445c8a6c7c1057673b47e07affected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before f0fe7ad5aff4f0fcf988913313c497de85f1e186affected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before ca581d237f3b8539c044205bb003de71d75d227caffected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before 192e9f9078c96be30b31c4b44d6294b24520fce5affected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before 0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44caffected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before 48d443d200237782dc82e6b60663ec414ef02e39affected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before 76ffbe911e2798c7296968f5fd72f7bf67207a8daffected · git
    • 1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b and later · before 269cdf353b5bdd15f1a079671b0f889113865f20affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.85-16.1.85-1
Debian:13linuxbefore 6.7.12-16.7.12-1

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-2024-26952May 1, 2024 · ksmbd: fix potencial out-of-bounds when buffer offset is invalid
    31Monitor
  • ← EarlierCVE-2024-26954May 1, 2024 · ksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16()
    28Monitor
  • Later →CVE-2024-26956May 1, 2024 · nilfs2: fix failure to detect DAT corruption in btree and direct mappings
    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 Linux0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44cVendor (CNA)
Linux Linux192e9f9078c96be30b31c4b44d6294b24520fce5Vendor (CNA)
Linux Linux269cdf353b5bdd15f1a079671b0f889113865f20Vendor (CNA)
Linux Linux32eaee72e96590a75445c8a6c7c1057673b47e07Vendor (CNA)
Linux Linux48d443d200237782dc82e6b60663ec414ef02e39Vendor (CNA)
Linux Linux76ffbe911e2798c7296968f5fd72f7bf67207a8dVendor (CNA)
Linux Linux91e4c4595fae5e87069e44687ae879091783c183Vendor (CNA)
Linux Linuxca581d237f3b8539c044205bb003de71d75d227cVendor (CNA)
Linux Linuxf0fe7ad5aff4f0fcf988913313c497de85f1e186Vendor (CNA)
debian:linux6.1.85-1 · 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
high · data or configuration can be modified
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
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 (10 more)

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

All records