CVE-2025-0395: When the assert() function in the GNU C Library versions 2.13 to 2.40 fails, it does not allocate enough space for the assertion failure mes
Noroxi assessment
Priority: Monitor (action score 24/100)
- 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: 0.35% (FIRST EPSS).
- Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: azl3 glibc 2.38-11 on Azure Linux 3.0 2.38-11; cbl2 glibc 2.35-7 on CBL Mariner 2.0 2.35-8; cbl2 glibc 2.35-9 on CBL Mariner 2.0 2.35-8.
Low priority for now. Upgrade to azl3 glibc 2.38-11 on Azure Linux 3.0 2.38-11; cbl2 glibc 2.35-7 on CBL Mariner 2.0 2.35-8; cbl2 glibc 2.35-9 on CBL Mariner 2.0 2.35-8 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
When the assert() function in the GNU C Library versions 2.13 to 2.40 fails, it does not allocate enough space for the assertion failure message string and size information, which may lead to a buffer overflow if the message string size aligns to page size.
- BDU:2025-01120
- ALSA-2025:3828
- ALSA-2025:4244
- DLA-4143-1
- openSUSE-SU-2025:14851-1
- openSUSE-SU-2026:20133-1
- RHSA-2025:3828
- RHSA-2025:4241
- RHSA-2025:4242
- RHSA-2025:4243
- RHSA-2025:4244
- RLSA-2025:3828
- RLSA-2025:4244
- SUSE-SU-2025:0510-1
- SUSE-SU-2025:0562-1
- SUSE-SU-2025:0582-1
- SUSE-SU-2025:20135-1
- SUSE-SU-2025:20236-1
- SUSE-SU-2026:20178-1
- SUSE-SU-2026:20198-1
- Published
- Jan 22, 2025
- Updated
- Oct 15, 2026
- EPSS
- 0.3% · 29th percentile
- CWE
- CWE-131
Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.2 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- proof of concept
- 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.
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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.
We use this product, ask for helpAffected 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.
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (glibc). Independent of NVD's CPE analysis and usually ahead of it.
The GNU C Library glibc
- 2.13 and later · up to and including 2.40affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | compat-libpthread-nonshared | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-all-langpacks | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-benchtests | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-common | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-devel | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-doc | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-gconv-extra | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-headers | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-aa | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-af | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-agr | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-ak | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-am | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-an | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-anp | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-ar | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-as | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-ast | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-ayc | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-az | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-be | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-bem | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
| AlmaLinux:8 | glibc-langpack-ber | before 2.28-251.el8_10.16 | 2.28-251.el8_10.16 |
+96
Same product
the gnu c library: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-19499Buffer overflow in strfmon and strfmon_l right-justification padding30Monitor
- CVE-2026-84243gettext: Directory traversal via the LANGUAGE environment variable28Monitor
- CVE-2026-6791Potential stack-based buffer clash during tilde expansion in wordexp26Monitor
Published before and after this one in the same product
- Later →CVE-2025-8058Jul 23, 2025 · The regcomp function in the GNU C library version from 2.4 to 2.41 is
subject to a double free if some previous allocation fails.23Monitor
- Later →CVE-2026-18374Aug 27, 2026 · Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library versio19Monitor
- Later →CVE-2026-89092Sep 11, 2026 · Stack overflow in nscd due to unbounded alloca use16Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| azl3 glibc 2.38-11 on Azure Linux 3.0 | 2.38-11 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 glibc 2.35-7 on CBL Mariner 2.0 | 2.35-8 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 glibc 2.35-9 on CBL Mariner 2.0 | 2.35-8 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 glibc 2.35-9 on CBL-Mariner 2.0 | 2.35-8 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:compat-libpthread-nonshared | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-all-langpacks | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-benchtests | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-common | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-devel | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-doc | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-gconv-extra | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-headers | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-langpack-aa | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-langpack-af | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:glibc-langpack-agr | 2.28-251.el8_10.16 · AlmaLinux:8 | Package registry (OSV) |
| debian:glibc | 2.36-9+deb12u10 · Debian:12 | Package registry (OSV) |
| opensuse:glibc | 2.38-150600.14.23.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:glibc-cross-aarch64-src | 2.40-160000.3.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:glibc-cross-ppc64le-src | 2.40-160000.3.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:glibc-cross-riscv64-src | 2.40-160000.3.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:glibc-cross-s390x-src | 2.40-160000.3.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| red hat:compat-libpthread-nonshared | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:glibc-all-langpacks-debuginfo | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:glibc-benchtests-debuginfo | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:glibc-common-debuginfo | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:glibc-debuginfo | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:glibc-debugsource | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:glibc-gconv-extra-debuginfo | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:glibc-utils | 0:2.28-251.el8_10.16 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
+7
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 researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Qualys Security Advisoryfinder
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).
Technical details
Attack conditions
- Someone with local access to the system 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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-131 · Incorrect Calculation of Buffer SizeCVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (11 more)Show less
- sourceware.org/git/?p=glibc.git;a=blob;f=advisories/GLIBC-SA-2025-0001
- sourceware.org/pipermail/libc-announce/2025/000044.html
- www.openwall.com/lists/oss-security/2025/01/22/4
- www.openwall.com/lists/oss-security/2025/01/22/4
- www.openwall.com/lists/oss-security/2025/01/23/2
- www.openwall.com/lists/oss-security/2025/04/13/1
- www.openwall.com/lists/oss-security/2025/04/24/7
- lists.debian.org/debian-lts-announce/2025/04/msg00039.html
- security.netapp.com/advisory/ntap-20250228-0006/
- cert-portal.siemens.com/productcert/html/ssa-398330.html
- cert-portal.siemens.com/productcert/html/ssa-577017.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.