CVE-2026-43331: x86/kexec: Disable KCOV instrumentation after load_segments()
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: 0.12% (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 0e96cd314c0d819c1635d68125a4d77852c2162e, 1e3e98596c2769721ade0418434852fb3af4849a, 593d67032544b9271094fc9b43e437e017cb2b2f.
Low priority for now. Upgrade to Linux Linux 0e96cd314c0d819c1635d68125a4d77852c2162e, 1e3e98596c2769721ade0418434852fb3af4849a, 593d67032544b9271094fc9b43e437e017cb2b2f 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: x86/kexec: Disable KCOV instrumentation after load_segments() The load_segments() function changes segment registers, invalidating GS base (which KCOV relies on for per-cpu data). When CONFIG_KCOV is enabled, any subsequent instrumented C code call (e.g. native_gdt_invalidate()) begins crashing the kernel in an endless loop. To reproduce the problem, it's sufficient to do kexec on a KCOV-instrumented kernel: $ kexec -l /boot/otherKernel $ kexec -e The real-world context for this problem is enabling crash dump collection in syzkaller. For this, the tool loads a panic kernel before fuzzing and then calls makedumpfile after the panic. This workflow requires both CONFIG_KEXEC and CONFIG_KCOV to be enabled simultaneously. Adding safeguards directly to the KCOV fast-path (__sanitizer_cov_trace_pc()) is also undesirable as it would introduce an extra performance overhead. Disabling instrumentation for the individual functions would be too fragile, so disable KCOV instrumentation for the entire machine_kexec_64.c and physaddr.c. If coverage-guided fuzzing ever needs these components in the future, other approaches should be considered. The problem is not relevant for 32 bit kernels as CONFIG_KCOV is not supported there. [ bp: Space out comment for better readability. ]
- Published
- May 8, 2026
- Updated
- Jun 19, 2026
- EPSS
- 0.1% · 1th percentile
- CWE
- —
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
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.
| 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 kernel6.6 and later · before 6.18.22
- linux linux kernel6.19 and later · before 6.19.12
- linux linux kernel7.0
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
- 6.6affected
- 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef and later · before 0e96cd314c0d819c1635d68125a4d77852c2162eaffected · git
- 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef and later · before 593d67032544b9271094fc9b43e437e017cb2b2faffected · git
- 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef and later · before 1e3e98596c2769721ade0418434852fb3af4849aaffected · git
- 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef and later · before de05c66fab8847237a9ca216934e56d3ee837f08affected · git
- 0d345996e4cb573f8cc81d49b3ee9a7fd2035bef and later · before 917e3ad3321e75ca0223d5ccf26ceda116aa51e1affected · git
- before 6.6not affected · semver
- 6.6.143 and later · up to and including 6.6.*not affected · semver
- 6.12.93 and later · up to and including 6.12.*not affected · semver
- 6.18.22 and later · up to and including 6.18.*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:13 | linux | before 6.12.94-1 | 6.12.94-1 |
| Debian:14 | linux | before 6.19.12-1 | 6.19.12-1 |
| openSUSE:Leap 16.0 | dtb-aarch64 | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-64kb | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-azure | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-default | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-default-base | before 6.12.0-160000.38.1.160000.2.22 | 6.12.0-160000.38.1.160000.2.22 |
| openSUSE:Leap 16.0 | kernel-docs | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-kvmsmall | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-obs-build | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-obs-qa | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-rt | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-source | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-syms | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| openSUSE:Leap 16.0 | kernel-zfcpdump | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-azure | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-docs | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-kvmsmall | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-obs-qa | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Enterprise Server 16.0 | kernel-zfcpdump | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Micro 6.2 | kernel-64kb | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Micro 6.2 | kernel-default | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
| SUSE:Linux Micro 6.2 | kernel-default-base | before 6.12.0-160000.38.1.160000.2.23 | 6.12.0-160000.38.1.160000.2.23 |
| SUSE:Linux Micro 6.2 | kernel-rt | before 6.12.0-160000.38.1 | 6.12.0-160000.38.1 |
+3
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-43328May 8, 2026 · cpufreq: governor: fix double free in cpufreq_dbs_governor_init() error path31Monitor
- ← EarlierCVE-2026-43330May 8, 2026 · crypto: caam - fix overflow on long hmac keys31Monitor
- Later →CVE-2026-43333May 8, 2026 · bpf: reject direct access to nullable PTR_TO_BUF pointers22Monitor
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 | 0e96cd314c0d819c1635d68125a4d77852c2162e | Vendor (CNA) |
| Linux Linux | 1e3e98596c2769721ade0418434852fb3af4849a | Vendor (CNA) |
| Linux Linux | 593d67032544b9271094fc9b43e437e017cb2b2f | Vendor (CNA) |
| Linux Linux | 917e3ad3321e75ca0223d5ccf26ceda116aa51e1 | Vendor (CNA) |
| Linux Linux | de05c66fab8847237a9ca216934e56d3ee837f08 | Vendor (CNA) |
| debian:linux | 6.12.94-1 · Debian:13 | Package registry (OSV) |
| opensuse:dtb-aarch64 | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-64kb | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-azure | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-default-base | 6.12.0-160000.38.1.160000.2.22 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-docs | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-kvmsmall | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-build | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-obs-qa | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-rt | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-source | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:kernel-syms | 6.12.0-160000.38.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| suse:kernel-64kb | 6.12.0-160000.38.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-azure | 6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-default | 6.12.0-160000.38.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-default-base | 6.12.0-160000.38.1.160000.2.23 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-docs | 6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-kvmsmall | 6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-obs-build | 6.12.0-160000.38.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-obs-qa | 6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:kernel-rt | 6.12.0-160000.38.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-source | 6.12.0-160000.38.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:kernel-syms | 6.12.0-160000.38.1 · SUSE:Linux Micro Extras 6.2 | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.12.0-160000.38.1 · SUSE:Linux Enterprise Server 16.0 | 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.
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.
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)
—
CVSS 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 (4 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.