CVE-2025-40067: fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist
Vulnerability summary
CVE-2025-40067 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.6% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 19 · Related 17Timeline
- 28-10-2025PublishedVulnerability first disclosed.
- 30-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist Index allocation requires at least one bit in the $BITMAP attribute to track usage of index entries. If the bitmap is empty while index blocks are already present, this reflects on-disk corruption. syzbot triggered this condition using a malformed NTFS image. During a rename() operation involving a long filename (which spans multiple index entries), the empty bitmap allowed the name to be added without valid tracking. Subsequent deletion of the original entry failed with -ENOENT, due to unexpected index state. Reject such cases by verifying that the bitmap is not empty when index blocks exist.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
6%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.17% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu117 products
- linux< 6.8.0-106.106 | < 6.17.0-14.14
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1050.53 | < 6.17.0-1007.7
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.12.57-1 | < 6.17.6-1
Linux1 product
- linux≥ 47856e10f8d5e066aa26b1f9c02d933fe0620399, < aab2e34b139f6df71ab2b1adeec9927c206adc79 | ≥ b35a50d639ca5259466ef5fea85529bb4fb17d5b, < 978aac54e93ea35aab20b32ae393d3d33964e7ae | ≥ 3ed2cc6a6e93fbeb8c0cafce1e7fb1f64a331dcc, < be66551da203862c689c12e1d35ce87217c017c1 | ≥ d99208b91933fd2a58ed9ed321af07dacd06ddc3, < 039ddf353cc33f6546a87ec1ac3210637d714bec | ≥ d99208b91933fd2a58ed9ed321af07dacd06ddc3, < 0dc7117da8f92dd5fe077d712a756eccbe377d40 | 358d4f821c03add421a4c49290538a705852ccf1 | a285395020780adac1ffbc844069c3d700bf007a | ≥ 6.6.102, < 6.6.112 | ≥ 6.12.42, < 6.12.53 | ≥ 6.15.10, < 6.16 | ≥ 6.16.1, < 6.17 | 6.17
3 vendors · 119 products
