CVE-2026-52969: KVM: Reject wrapped offset in kvm_reset_dirty_gfn()
Noroxi assessment
Priority: Monitor (action score 31/100)
- 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: 0.19% (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 01b71b930f15728aa8599478a7ce90c19dcd9fc2, 0d419c23bb11b5c9664de777c47c1f04a235882d, 0eb281eb95b2d4eea4db1da5fe91023aecc97095; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.143.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 01b71b930f15728aa8599478a7ce90c19dcd9fc2, 0d419c23bb11b5c9664de777c47c1f04a235882d, 0eb281eb95b2d4eea4db1da5fe91023aecc97095; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.143.1-1 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: KVM: Reject wrapped offset in kvm_reset_dirty_gfn() kvm_reset_dirty_gfn() guards the gfn range with if (!memslot || (offset + __fls(mask)) >= memslot->npages) return; but offset is u64 and the addition is unchecked. The check can be silently bypassed by a u64 wrap. The dirty ring backing those entries is MAP_SHARED at KVM_DIRTY_LOG_PAGE_OFFSET of the vcpu fd, so the VMM can rewrite the slot and offset fields of any entry between when the kernel pushes them and when KVM_RESET_DIRTY_RINGS consumes them. On reset, kvm_dirty_ring_reset() re-reads the values via READ_ONCE() and feeds them straight back into this check; only the flags handshake is treated as the handover, the slot/offset payload is taken on trust. Crafting two entries entry[i].offset = 0xffffffffffffffc1 entry[i+1].offset = 0 makes the coalescing loop in kvm_dirty_ring_reset() compute delta = (s64)(0 - 0xffffffffffffffc1) = 63 which falls in [0, BITS_PER_LONG), so it folds entry[i+1] into the existing mask by setting bit 63. The trailing kvm_reset_dirty_gfn() call then sees offset = 0xffffffffffffffc1 and __fls(mask) = 63; the sum is 0 in u64 and the bounds check passes. That offset propagates into kvm_arch_mmu_enable_log_dirty_pt_masked() unchanged. On the legacy MMU path -- kvm_memslots_have_rmaps() == true, i.e. shadow paging, any VM that has allocated shadow roots, or a write-tracked slot -- it reaches gfn_to_rmap(), which indexes slot->arch.rmap[0][] with a near-U64_MAX gfn. That is an out-of-bounds load of a kvm_rmap_head, followed by a conditional clear of PT_WRITABLE_MASK in whatever the loaded pointer points at. The path is reachable from any process holding /dev/kvm. Range-check offset on its own first, so the addition cannot wrap. memslot->npages is bounded well below U64_MAX, so once offset < npages holds, offset + __fls(mask) (with __fls(mask) < BITS_PER_LONG) stays in range.
- Published
- Jun 24, 2026
- Updated
- Jul 15, 2026
- EPSS
- 0.1% · 9th percentile
- CWE
- CWE-129
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 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.
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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 kernel5.11 and later · before 5.15.209
- linux linux kernel5.16 and later · before 6.1.175
- linux linux kernel6.2 and later · before 6.6.141
- linux linux kernel6.7 and later · before 6.12.91
- linux linux kernel6.13 and later · before 6.18.33
- linux linux kernel6.19 and later · before 7.0.10
- linux linux kernel7.1
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
- 5.11affected
- fb04a1eddb1a65b6588a021bdc132270d5ae48bb and later · before 74f1a22f7a80f03d28ad8551a2d25d563433addfaffected · git
- fb04a1eddb1a65b6588a021bdc132270d5ae48bb and later · before 0eb281eb95b2d4eea4db1da5fe91023aecc97095affected · git
- fb04a1eddb1a65b6588a021bdc132270d5ae48bb and later · before 01b71b930f15728aa8599478a7ce90c19dcd9fc2affected · git
- fb04a1eddb1a65b6588a021bdc132270d5ae48bb and later · before b315b033a877b1ee6d827810b5d7bb4392ffcf8daffected · git
- fb04a1eddb1a65b6588a021bdc132270d5ae48bb and later · before 0d419c23bb11b5c9664de777c47c1f04a235882daffected · git
- fb04a1eddb1a65b6588a021bdc132270d5ae48bb and later · before ecf9b3ea7847fe14f34b8c41f00de1eb95c747daaffected · git
- fb04a1eddb1a65b6588a021bdc132270d5ae48bb and later · before 577a8d3bae0531f0e5ccfac919cd8192f920a804affected · git
- before 5.11not affected · semver
- 5.15.209 and later · up to and including 5.15.*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 6.1.176-1 | 6.1.176-1 |
| Debian:13 | linux | before 6.12.94-1 | 6.12.94-1 |
| Debian:14 | linux | before 7.0.10-1 | 7.0.10-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_57 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_43 | before 1-150500.11.5.1 | 1-150500.11.5.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.228.1.150400.24.116.1 | 5.14.21-150400.24.228.1.150400.24.116.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-rt | before 5.14.21-150400.15.176.1 | 5.14.21-150400.15.176.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source-rt | before 5.14.21-150400.15.176.1 | 5.14.21-150400.15.176.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.177.1.150500.6.83.2 | 5.14.21-150500.55.177.1.150500.6.83.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-rt | before 5.14.21-150500.13.151.1 | 5.14.21-150500.13.151.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-source | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-source-rt | before 5.14.21-150500.13.151.1 | 5.14.21-150500.13.151.1 |
| SUSE:Linux Enterprise Server 15 SP4-LTSS | kernel-zfcpdump | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
+1
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-2026-52952Jun 24, 2026 · iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset35Monitor
- ← EarlierCVE-2026-52959Jun 24, 2026 · virt: sev-guest: Do not use host-controlled page order in cleanup path31Monitor
- Later →CVE-2026-52978Jun 24, 2026 · net: psp: require admin permission for dev-set and key-rotate22Monitor
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 | 01b71b930f15728aa8599478a7ce90c19dcd9fc2 | Vendor (CNA) |
| Linux Linux | 0d419c23bb11b5c9664de777c47c1f04a235882d | Vendor (CNA) |
| Linux Linux | 0eb281eb95b2d4eea4db1da5fe91023aecc97095 | Vendor (CNA) |
| Linux Linux | 577a8d3bae0531f0e5ccfac919cd8192f920a804 | Vendor (CNA) |
| Linux Linux | 74f1a22f7a80f03d28ad8551a2d25d563433addf | Vendor (CNA) |
| Linux Linux | b315b033a877b1ee6d827810b5d7bb4392ffcf8d | Vendor (CNA) |
| Linux Linux | ecf9b3ea7847fe14f34b8c41f00de1eb95c747da | Vendor (CNA) |
| azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 | 6.6.143.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150400.24.228.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.228.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.228.1.150400.24.116.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150400.24.228.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_57 | 1-150400.9.3.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_43 | 1-150500.11.5.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150400.24.228.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 5.14.21-150500.13.151.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150400.24.228.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-source-rt | 5.14.21-150500.13.151.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150400.24.228.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150400.24.228.1 · 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.
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.
- CVE-2026-6401825 days apartnet: mana: validate rx_req_idx to prevent out-of-bounds array access37Monitor
- CVE-2026-4311049 days apartwifi: brcmfmac: validate bsscfg indices in IF events35Monitor
- CVE-2026-4317249 days apartwifi: iwlwifi: fix 22000 series SMEM parsing35Monitor
- CVE-2026-2324698 days apartwifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration35Monitor
- CVE-2026-5338625 days apartiio: adc: ti-ads1298: add bounds check to pga_settings index31Monitor
- CVE-2026-6403625 days apartcgroup/rstat: validate cpu before css_rstat_cpu() access31Monitor
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0440 · Jun 25, 2026(Linux Kernel Güvenlik Bildirimi)
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
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-129 · Improper Validation of Array IndexCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (9 more)Show less
- git.kernel.org/stable/c/0d419c23bb11b5c9664de777c47c1f04a235882d
- git.kernel.org/stable/c/0eb281eb95b2d4eea4db1da5fe91023aecc97095
- git.kernel.org/stable/c/577a8d3bae0531f0e5ccfac919cd8192f920a804
- git.kernel.org/stable/c/74f1a22f7a80f03d28ad8551a2d25d563433addf
- git.kernel.org/stable/c/b315b033a877b1ee6d827810b5d7bb4392ffcf8d
- git.kernel.org/stable/c/ecf9b3ea7847fe14f34b8c41f00de1eb95c747da
- access.redhat.com/security/cve/CVE-2026-52969
- bugzilla.redhat.com/show_bug.cgi?id=2492434
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52969.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.