hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()
Noroxi assessment
Priority: Monitor (action score 22/100)
- 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: 0.16% (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 26215b7ee923b9251f7bb12c4e5f09dc465d35f2, 965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd, 9a8862820cbf1f18dca4f3b4c289d88561b3a384.
Low priority for now. Upgrade to Linux Linux 26215b7ee923b9251f7bb12c4e5f09dc465d35f2, 965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd, 9a8862820cbf1f18dca4f3b4c289d88561b3a384 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: hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param() Syzkaller reports a null-ptr-deref bug as follows: ====================================================== KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:hugetlbfs_parse_param+0x1dd/0x8e0 fs/hugetlbfs/inode.c:1380 [...] Call Trace: <TASK> vfs_parse_fs_param fs/fs_context.c:148 [inline] vfs_parse_fs_param+0x1f9/0x3c0 fs/fs_context.c:129 vfs_parse_fs_string+0xdb/0x170 fs/fs_context.c:191 generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:231 do_new_mount fs/namespace.c:3036 [inline] path_mount+0x12de/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] </TASK> ====================================================== According to commit "vfs: parse: deal with zero length string value", kernel will set the param->string to null pointer in vfs_parse_fs_string() if fs string has zero length. Yet the problem is that, hugetlbfs_parse_param() will dereference the param->string, without checking whether it is a null pointer. To be more specific, if hugetlbfs_parse_param() parses an illegal mount parameter, such as "size=,", kernel will constructs struct fs_parameter with null pointer in vfs_parse_fs_string(), then passes this struct fs_parameter to hugetlbfs_parse_param(), which triggers the above null-ptr-deref bug. This patch solves it by adding sanity check on param->string in hugetlbfs_parse_param().
- Published
- Sep 15, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.1% · 4th percentile
- CWE
- CWE-476
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
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
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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.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernelbefore 5.4.229
- linux linux kernel5.5 and later · before 5.10.163
- linux linux kernel5.11 and later · before 5.15.86
- linux linux kernel5.16 and later · before 6.0.16
- linux linux kernel6.1 and later · before 6.1.2
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
- 5.1affected
- 32021982a324dce93b4ae00c06213bf45fb319c8 and later · before fa71639873518e3587632ae58e25e4a96b57fa90affected · git
- 32021982a324dce93b4ae00c06213bf45fb319c8 and later · before dcd28191be9bbf307ba51a5b485773a55b0037c4affected · git
- 32021982a324dce93b4ae00c06213bf45fb319c8 and later · before 9a8862820cbf1f18dca4f3b4c289d88561b3a384affected · git
- 32021982a324dce93b4ae00c06213bf45fb319c8 and later · before 965e8f8ae0f642b5528f5a82b7bcaf15a659d5bdaffected · git
- 32021982a324dce93b4ae00c06213bf45fb319c8 and later · before f2207145693ae5697a7b59e2add4b92f9e5b0e3caffected · git
- 32021982a324dce93b4ae00c06213bf45fb319c8 and later · before 26215b7ee923b9251f7bb12c4e5f09dc465d35f2affected · git
- before 5.1not affected · semver
- 5.4.229 and later · up to and including 5.4.*not affected · semver
- 5.10.163 and later · up to and including 5.10.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.4-1 | 6.1.4-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-64kb | before 5.3.18-150300.59.226.2 | 5.3.18-150300.59.226.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-default-base | before 5.3.18-150300.59.226.2.150300.18.134.2 | 5.3.18-150300.59.226.2.150300.18.134.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-docs | before 5.3.18-150300.59.226.3 | 5.3.18-150300.59.226.3 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-obs-build | before 5.3.18-150300.59.226.2 | 5.3.18-150300.59.226.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-preempt | before 5.3.18-150300.59.226.2 | 5.3.18-150300.59.226.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-source | before 5.3.18-150300.59.226.2 | 5.3.18-150300.59.226.2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-syms | before 5.3.18-150300.59.226.1 | 5.3.18-150300.59.226.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.184.1 | 5.14.21-150400.24.184.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.184.1 | 5.14.21-150400.24.184.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.184.1 | 5.14.21-150400.24.184.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-source | before 5.14.21-150400.24.184.1 | 5.14.21-150400.24.184.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.184.1 | 5.14.21-150400.24.184.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.127.1 | 5.14.21-150500.55.127.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.127.1 | 5.14.21-150500.55.127.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.127.1 | 5.14.21-150500.55.127.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.127.1 | 5.14.21-150500.55.127.1 |
| SUSE:Linux Enterprise Live Patching 15 SP3 | kernel-default | before 5.3.18-150300.59.226.2 | 5.3.18-150300.59.226.2 |
| SUSE:Linux Enterprise Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_63 | before 1-150300.7.5.2 | 1-150300.7.5.2 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_46 | before 1-150400.9.5.1 | 1-150400.9.5.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_32 | before 1-150500.11.3.1 | 1-150500.11.3.1 |
| SUSE:Linux Enterprise Micro 5.2 | kernel-rt | before 5.3.18-150300.226.1 | 5.3.18-150300.226.1 |
| SUSE:Linux Enterprise Micro 5.2 | kernel-source-rt | before 5.3.18-150300.226.1 | 5.3.18-150300.226.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.184.1 | 5.14.21-150400.24.184.1 |
+11
Same product
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- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
Published before and after this one in the same product
- ← EarlierCVE-2022-50332Sep 15, 2025 · video/aperture: Call sysfb_disable() before removing PCI devices22Monitor
- ← EarlierCVE-2022-50333Sep 15, 2025 · fs: jfs: fix shift-out-of-bounds in dbDiscardAG28Monitor
- Later →CVE-2022-50335Sep 15, 2025 · 9p: set req refcount to zero to avoid uninitialized usage22Monitor
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 |
|---|---|---|
| Linux Linux | 26215b7ee923b9251f7bb12c4e5f09dc465d35f2 | Vendor (CNA) |
| Linux Linux | 965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd | Vendor (CNA) |
| Linux Linux | 9a8862820cbf1f18dca4f3b4c289d88561b3a384 | Vendor (CNA) |
| Linux Linux | dcd28191be9bbf307ba51a5b485773a55b0037c4 | Vendor (CNA) |
| Linux Linux | f2207145693ae5697a7b59e2add4b92f9e5b0e3c | Vendor (CNA) |
| Linux Linux | fa71639873518e3587632ae58e25e4a96b57fa90 | Vendor (CNA) |
| debian:linux | 6.1.4-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150400.24.184.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.184.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.184.1.150400.24.94.2 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150400.24.184.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP3_Update_63 | 1-150300.7.5.2 · SUSE:Linux Enterprise Live Patching 15 SP3 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_46 | 1-150400.9.5.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150400.24.184.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 5.3.18-150300.226.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150400.24.184.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-source-rt | 5.3.18-150300.226.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150400.24.184.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150400.24.184.1 · SUSE:Linux Enterprise Server 15 SP4-LTSS | Package 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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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.
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).
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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- git.kernel.org/stable/c/965e8f8ae0f642b5528f5a82b7bcaf15a659d5bd
- git.kernel.org/stable/c/9a8862820cbf1f18dca4f3b4c289d88561b3a384
- git.kernel.org/stable/c/dcd28191be9bbf307ba51a5b485773a55b0037c4
- git.kernel.org/stable/c/f2207145693ae5697a7b59e2add4b92f9e5b0e3c
- git.kernel.org/stable/c/fa71639873518e3587632ae58e25e4a96b57fa90
Vendor advisories and official records. Exploit/PoC links are deliberately left out.