In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry W…
CVE-2026-99078 · GHSA-365v-92v4-8whj · EUVD-2026-108744 · published 23 Oct 2026
How serious is it
- Severity: critical, CVSS score 9.8 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-2026-99078?
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: patch: 6.6.160
- Linux Linux: 4c2a1323680709078736a2886c754004e9fe42e6 <d215d09606b0fcd18ad1eb532995782a21cea49d
- Linux Linux: 4c2a1323680709078736a2886c754004e9fe42e6 <63811edf512584c946e5e96b100e9e280703bbb5
- Linux Linux: patch: 7.2.11
- Linux Linux: patch: 7.3
- Linux Linux: 4c2a1323680709078736a2886c754004e9fe42e6 <867119b4b588037724b85839d534465f0334d9bd
- Linux Linux: patch: 6.12.113
- Linux Linux: patch: 6.18.57
- Linux Linux: 4c2a1323680709078736a2886c754004e9fe42e6 <3d73a1164a8c6b4461907a65cb6c022ea4fd39af
- Linux Linux: patch: 0
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:
net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
With AF_XDP on a striding RQ, mlx5e defers releasing XSK buffers until
an MPWQE is refilled. If XSK allocation then returns -ENOMEM,
actual_wq_head is not advanced and a later NAPI poll retries the same
WQE.
mlx5e_free_rx_mpwqe() leaves each released slot marked as releasable. On
retry it can therefore call xsk_buff_free() again through stale pointers
after the frames have returned to the XSK pool and been reallocated.
Set all skip_release_bitmap bits in the common error path of
mlx5e_xsk_alloc_rx_mpwqe(). This matches mlx5e_alloc_rx_mpwqe(). A
successful allocation already clears the bitmap after replacing every
buffer, so retries become idempotent without changing the success path.
Fault injection forced three consecutive failures for one selected MPWQE.
Both an early allocation failure and a partial 8-of-16-buffer unwind
released the original 16 XSK buffers only once. Each error left a full
bitmap, the following NAPI retry skipped the release, and a later
successful allocation cleared it. A 20-second AF_XDP zero-copy pressure
run exercised 1,575,262 buffer allocation failures without invalid
descriptors, WQE errors, or kernel warnings.
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/f3a52e2ec2788a7f6b64137985c087188a54ad4f
- git.kernel.org/stable/c/d215d09606b0fcd18ad1eb532995782a21cea49d
- git.kernel.org/stable/c/867119b4b588037724b85839d534465f0334d9bd
- git.kernel.org/stable/c/3d73a1164a8c6b4461907a65cb6c022ea4fd39af
- git.kernel.org/stable/c/63811edf512584c946e5e96b100e9e280703bbb5
- nvd.nist.gov/vuln/detail/CVE-2026-99078
Merged from ENISA EUVD. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON