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NVD / CVE Program· CNA Linux

CVE-2026-45878: drm/amdkfd: Fix watch_id bounds checking in debug address watch v2

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: 0.20% (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 2b36c0c1bcbbe15f6cfa9652084b3124c835a150, 3c38a0f07aa2bfef2b219b1f045534ad93f85afd, 5a19302cab5cec7ae7f1a60c619951e6c17d8742.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2b36c0c1bcbbe15f6cfa9652084b3124c835a150, 3c38a0f07aa2bfef2b219b1f045534ad93f85afd, 5a19302cab5cec7ae7f1a60c619951e6c17d8742 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: drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 The address watch clear code receives watch_id as an unsigned value (u32), but some helper functions were using a signed int and checked bits by shifting with watch_id. If a very large watch_id is passed from userspace, it can be converted to a negative value. This can cause invalid shifts and may access memory outside the watch_points array. drm/amdkfd: Fix watch_id bounds checking in debug address watch v2 Fix this by checking that watch_id is within MAX_WATCH_ADDRESSES before using it. Also use BIT(watch_id) to test and clear bits safely. This keeps the behavior unchanged for valid watch IDs and avoids undefined behavior for invalid ones. Fixes the below: drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c:448 kfd_dbg_trap_clear_dev_address_watch() error: buffer overflow 'pdd->watch_points' 4 <= u32max user_rl='0-3,2147483648-u32max' uncapped drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_debug.c 433 int kfd_dbg_trap_clear_dev_address_watch(struct kfd_process_device *pdd, 434 uint32_t watch_id) 435 { 436 int r; 437 438 if (!kfd_dbg_owns_dev_watch_id(pdd, watch_id)) kfd_dbg_owns_dev_watch_id() doesn't check for negative values so if watch_id is larger than INT_MAX it leads to a buffer overflow. (Negative shifts are undefined). 439 return -EINVAL; 440 441 if (!pdd->dev->kfd->shared_resources.enable_mes) { 442 r = debug_lock_and_unmap(pdd->dev->dqm); 443 if (r) 444 return r; 445 } 446 447 amdgpu_gfx_off_ctrl(pdd->dev->adev, false); --> 448 pdd->watch_points[watch_id] = pdd->dev->kfd2kgd->clear_address_watch( 449 pdd->dev->adev, 450 watch_id); v2: (as per, Jonathan Kim) - Add early watch_id >= MAX_WATCH_ADDRESSES validation in the set path to match the clear path. - Drop the redundant bounds check in kfd_dbg_owns_dev_watch_id().

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 10th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • 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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Affected 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.5 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.14
  • linux linux kernel6.19 and later · before 6.19.4

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

    • 6.5affected
    • e0f85f4690d089cc1a60337decafb1acf7eec45e and later · before 971bf8e61e9b4abaacf9b35eaf76ec222758f9d6affected · git
    • e0f85f4690d089cc1a60337decafb1acf7eec45e and later · before a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488affected · git
    • e0f85f4690d089cc1a60337decafb1acf7eec45e and later · before 2b36c0c1bcbbe15f6cfa9652084b3124c835a150affected · git
    • e0f85f4690d089cc1a60337decafb1acf7eec45e and later · before 3c38a0f07aa2bfef2b219b1f045534ad93f85afdaffected · git
    • e0f85f4690d089cc1a60337decafb1acf7eec45e and later · before 5a19302cab5cec7ae7f1a60c619951e6c17d8742affected · git
    • before 6.5not affected · semver
    • 6.6.128 and later · up to and including 6.6.*not affected · semver
    • 6.12.75 and later · up to and including 6.12.*not affected · semver
    • 6.18.14 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.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.49.1.el10_26.12.0-211.49.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-45873May 27, 2026 · netfilter: nft_set_rbtree: check for partial overlaps in anonymous sets
    22Monitor
  • ← EarlierCVE-2026-45877May 27, 2026 · HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients
    22Monitor
  • Later →CVE-2026-45880May 27, 2026 · PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2b36c0c1bcbbe15f6cfa9652084b3124c835a150Vendor (CNA)
Linux Linux3c38a0f07aa2bfef2b219b1f045534ad93f85afdVendor (CNA)
Linux Linux5a19302cab5cec7ae7f1a60c619951e6c17d8742Vendor (CNA)
Linux Linux971bf8e61e9b4abaacf9b35eaf76ec222758f9d6Vendor (CNA)
Linux Linuxa0d367e13db63a6ed76ee0d0a8c3a58c1fa98488Vendor (CNA)
almalinux:kernel6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.49.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.12.85-1 · Debian:13Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-aarch640:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:6.12.0-211.49.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+10

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 researchers

Finders, 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records