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Linux KernelOperating system · Linux

CVE-2026-23448

HIGH · 7.8 CVSS v3.1 Published 2026-04-03
Fix available
A fix is available. Upgrade to 6.6.130 / 6.12.78 or later.
See remediation →
80/100
Remediation priority · High
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check cdc_ncm_rx_verify_ndp16() validates that the NDP header and its DPE entries fit within the skb. The first check correctly accounts for ndpoffset: if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) but the second check omits it: if ((sizeof(struct usb_cdc_ncm_ndp16) + ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) This validates the DPE array size against the total skb length as if the NDP were at offset 0, rather than at ndpoffset. When the NDP is placed near the end of the NTB (large wNdpIndex), the DPE entries can extend past the skb data buffer even though the check passes. cdc_ncm_rx_fixup() then reads out-of-bounds memory when iterating the DPE array. Add ndpoffset to the nframes bounds check and use struct_size_t() to express the NDP-plus-DPE-array size more clearly.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 3.8, < 6.6.130>= 6.7, < 6.12.78>= 6.13, < 6.18.20>= 6.19, < 6.19.10= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.6.130 / 6.12.78 / 6.18.20 or later
Fixed in 6.6.1306.12.786.18.20
Vendor patch git.kernel.org →
Recommended fix High confidence

Upgrade to kernel 6.6.130 (or later 6.6.y), 6.12.78 (or later 6.7-6.12.y), 6.18.20 (or later 6.13-6.18.y), or 6.19.10 (or later 6.19.y) - choose the next stable release in your current branch

  1. Identify the current kernel version using `uname -r`
  2. Determine which version branch the system is running (e.g., 6.6.x, 6.7-6.12.x, 6.13-6.18.x, or 6.19.x)
  3. Plan maintenance window for kernel upgrade as this requires system reboot
  4. Backup critical data before proceeding with kernel upgrade
  5. Upgrade to the appropriate fixed kernel version: 6.6.130 or higher for 6.6.y, 6.12.78 or higher for 6.7-6.12.y, 6.18.20 or higher for 6.13-6.18.y, 6.19.10 or higher for 6.19.y
  6. For Debian/Ubuntu: `apt-get update && apt-get upgrade linux-image-generic`
  7. For RHEL/CentOS: `yum update kernel`
  8. For Fedora: `dnf update kernel`
Caveat Kernel upgrades may require rebuilding third-party kernel modules (like proprietary drivers) and should be tested in a staging environment before production deployment

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-23448 in production — separate from our analysis above.

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  • Version or environment caveats, and links to real fixes
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