CVE catalog
CVE-2026-55392
NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying craf
- Severity
- Medium · CVSS 6.7
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.15% · Oct 25, 2026
NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | nilfs-tools | sid | 2.2.11-2 | vulnerable |
| Debian | nilfs-tools | forky | 2.2.11-2 | vulnerable |
| Debian | nilfs-tools | trixie | 2.2.11-2 | vulnerable |
| Debian | nilfs-tools | bookworm | 2.2.9-1 | vulnerable |
| Cpe | nilfs-tools | Not reported | Not reported | vulnerable |
| Opensuse | nilfs-utils | leap 16.0 | 2.2.9-bp160.2.1 | fixed |
| Opensuse | nilfs-utils | tumbleweed | 2.3.1-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nilfs-tools | source | sid | (unfixed) | unimportant | Not reported | [1140362] |
| Debian | nilfs-tools | source | forky | (unfixed) | unimportant | Not reported | [1140362] |
| Debian | nilfs-tools | source | trixie | (unfixed) | unimportant | Not reported | [1140362] |
| Debian | nilfs-tools | source | bookworm | (unfixed) | unimportant | Not reported | [1140362] |
| Opensuse | nilfs-utils | rpm | leap 16.0 | 2.2.9-bp160.2.1 | Not reported | OPENSUSE-SU-2026:21183-1 | Not reported |
| Opensuse | nilfs-utils | rpm | tumbleweed | 2.3.1-1.1 | Not reported | OPENSUSE-SU-2026:11094-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [nilfs-tools]Affected
Details (2)
2.2.9-1· amd64 · bookwormAffected
nvd · nilfs-tools · debian · bookworm; nvd · nilfs-tools · debian · 12
2.2.9-1· arm64 · bookwormAffected
nvd · nilfs-tools · debian · bookworm; nvd · nilfs-tools · debian · 12
[Debian 13 (Trixie)]
- [nilfs-tools]Affected
Details (2)
2.2.11-2· amd64 · trixieAffected
nvd · nilfs-tools · debian · 13
2.2.11-2· arm64 · trixieAffected
nvd · nilfs-tools · debian · 13
[openSUSE Tumbleweed]
- [libnilfs3]Unknown
Source package: [nilfs-utils]
Details (1)
2.3.1-2.3· x86_64 · tumbleweedUnknown · Fixed:
2.3.1-1.1Version impact unknown
nvd · nilfs-utils · opensuse · tumbleweed
- [libnilfsgc3]Unknown
Source package: [nilfs-utils]
Details (1)
2.3.1-2.3· x86_64 · tumbleweedUnknown · Fixed:
2.3.1-1.1Version impact unknown
nvd · nilfs-utils · opensuse · tumbleweed
- [nilfs-utils-devel]Unknown
Source package: [nilfs-utils]
Details (1)
2.3.1-2.3· x86_64 · tumbleweedUnknown · Fixed:
2.3.1-1.1Version impact unknown
nvd · nilfs-utils · opensuse · tumbleweed
- [nilfs-utils]Fixed
Source package: [nilfs-utils]
Details (1)
2.3.1-2.3· x86_64 · tumbleweedFixed · Fixed:
2.3.1-1.1nvd · nilfs-utils · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11094-1.json]
- [https://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9]
- [https://github.com/nilfs-dev/nilfs-utils/issues/26]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-55392]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-55392]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11094-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21183-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-55392]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55392.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]