In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Fix out of bounds check on CCW array The routine ccw…
CVE-2026-80550 · published 26 Aug 2026
How serious is it
- Severity: high, CVSS score 7.9 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-80550?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 4.12
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
s390/vfio_ccw: Fix out of bounds check on CCW array
The routine ccwchain_calc_length() counts the number of channel
command words (CCWs) that are chained together in a single channel
program, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs.
The loop itself is "do..while (count < 257)", and while the logic in
is_cpa_within_range() correctly adjusts between the 0-index array of
CCWs and the count of CCWs starting at 1, this means it would look
at a possible 257th CCW before ending the loop and (correctly)
returning an error.
Fix this by restructuring the loop to break as soon as 256 CCWs
(thus indexes 0-255) are examined, without looking at memory
outside the range.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2
- git.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3d
- git.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fb
- git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd
- git.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977
- git.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65
- git.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09
- git.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON