Trending
CVE-2026-63812

CVE detail

CVE-2026-63812

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node() When __destroy_extent_node() sets the inode flag FI_NO_EXTENT, it does not reset the length of the largest extent to 0 and update the inode folio. Since modifications to the extent tree are disallowed afterward, the cached largest extent may become stale. This can trigger the following error in xfstests generic/388: F2FS-fs (dm-0): sanity_check_extent_cache: inode (ino=1761) extent info [220057, 57, 6] is incorrect, run fsck to fix In the f2fs_drop_inode path, __destroy_extent_node() does not need to guarantee that et->node_cnt is 0, because concurrency with writeback is expected in this path, and writeback may update the extent cache. This patch reverts commit ed78aeebef05 ("f2fs: fix node_cnt race between extent node destroy and writeback"), and remove the unnecessary zero check of et->node_cnt.

CVSS 7.8 · HighBuzz score 29.5

Buzz score

Why this CVE is surfacing

Buzz score total 29.5

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 19.5 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0

Mention score

19.5

6 evidence mentions in the snapshot

Diversity score

10.0

2 sources across 2 categories

KEV score

0.0

No KEV entry observed

OTX score

0.0

0 OTX pulses

PoC score

0.0

0 repos · best confidence N/A

Best PoC traction

Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions: 6; within the 30d window
Peak daily: 5; highest bucket

Evidence

Source links by recency

Newest mentions first

6 source links · newest first

CVE-2026-63812 f2fs: fix incorrect FI_NO_EXTENT handling in __destroy_extent_node()Microsoft MSRC
Information published.
vendormsrc.microsoft.comJul 20, 2026, 8:07 AM
https://git.kernel.org/stable/c/edf12cbeeeabe799bd2ee21fdb5c336cce6fbad7git.kernel.org
No excerpt available.
Patchgit.kernel.orgJul 19, 2026, 12:16 PM
https://git.kernel.org/stable/c/7e4d8f98be63f98856a5176b9188dada6e7ba9eegit.kernel.org
No excerpt available.
Patchgit.kernel.orgJul 19, 2026, 12:16 PM
https://git.kernel.org/stable/c/58a5deb220bcac4c73bf58954c0845644c997487git.kernel.org
No excerpt available.
Patchgit.kernel.orgJul 19, 2026, 12:16 PM
https://git.kernel.org/stable/c/20190e498057997532c7f186d081011f18e0a462git.kernel.org
No excerpt available.
Patchgit.kernel.orgJul 19, 2026, 12:16 PM
https://git.kernel.org/stable/c/1f70ddb28a3c71df124da5fa4040c808116d6bb9git.kernel.org
No excerpt available.
Patchgit.kernel.orgJul 19, 2026, 12:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars

No public PoC repositories have been matched yet.

External lookup

Potential internet exposure

Potential exposure only — not proof of vulnerability.Shodan results indicate potentially internet-exposed products, not confirmed vulnerable systems. They do not confirm that any returned system is vulnerable to CVE-2026-63812.

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Product CPE queries

Derived from this CVE's existing NVD CPE 2.3 records; the application, operating-system, or hardware part is retained.

Product query unavailableNo valid raw CPE 2.3 product record is available for this CVE, so no product-level Shodan query is shown.

Exact CVE query

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Metadata

Canonical fields

NVD status

Received

Published

Jul 19, 2026

Modified

Jul 20, 2026

Official record

Authoritative NVD record

CVSS vector

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

CWE IDs

Unavailable

Vendor classifications

Unavailable

How this vector reads

CVSS 3.1 base metrics decoded below. This explanation does not recalculate or change the NVD score.

Attack Vector (AV): Local. The attacker needs local access to the vulnerable system.
Attack Complexity (AC): Low. No special conditions beyond the attacker-controlled steps are required.
Privileges Required (PR): Low. The attacker needs basic user-level privileges.
User Interaction (UI): None. Exploitation does not require another user to act.
Scope (S): Unchanged. Impacts remain within the vulnerable security authority.
Confidentiality Impact (C): High. There is a total or serious impact to this security property.
Integrity Impact (I): High. There is a total or serious impact to this security property.
Availability Impact (A): High. There is a total or serious impact to this security property.

Signals

Exploitation indicators

0 stored signals · no KEV · 0 OTX pulses