Answer in brief
CVE-2026-99079 records a Critical severity (CVSS 9.8) vulnerability in net/mlx5e: Prevent stale XSK buffer release on refill retry. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=3f93f82988bc6b4104314bf9aa485d47fbb7e241 <32bbb870078d467479965c21bbc4960c57eea208 || >=3f93f82988bc6b4104314bf9aa485d47fbb7e241 <34d1db2b18e1c1d189e34dd51923e031815f88e3 || >=3f93f82988bc6b4104314bf9aa485d47fbb7e241 <639522e5056cade578a324acfa993ec6c9f7f5dc || >=3f93f82988bc6b4104314bf9aa485d47fbb7e241 <655f47477054d19de3b138840be229a1a4490d0c || >=3f93f82988bc6b4104314bf9aa485d47fbb7e241 <e01620844c5c88b6fcf819d171df8e3976a0e76f | 32bbb870078d467479965c21bbc4960c57eea208, 34d1db2b18e1c1d189e34dd51923e031815f88e3, 639522e5056cade578a324acfa993ec6c9f7f5dc, 655f47477054d19de3b138840be229a1a4490d0c, e01620844c5c88b6fcf819d171df8e3976a0e76f |
| Linux/Linuxgeneric | 6.4 | Not reported |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Prevent stale XSK buffer release on refill retry When an XDP redirect to an AF_XDP socket fails because its RX ring is full, the XSK core frees the buffer. During the subsequent batched refill of a legacy cyclic RQ, mlx5e also releases the WQE's XSK buffer before allocating a replacement. If that refill succeeds only partially, a WQE left without a replacement retains its old buffer pointer. The buffer can meanwhile be allocated to another WQE. A later refill retry can then free the live buffer through the stale pointer and publish the same UMEM frame twice. Mark the WQE as released immediately after the driver-side free. The flag is already cleared when a replacement buffer is assigned, so refill retries no longer release stale pointers. The failure is silent and produces no kernel warning or splat. A standalone legacy cyclic-RQ zero-copy libxsk reproducer, using 64-byte UDP traffic offered at 12 Mpps, detected it: stock stopped after 2,854,914 packets in 4.094 seconds, with 4,542 xdp_rx_ring_full events and 64 ownership/double-publication errors. With this change it processed 356,904,225 packets in 30 seconds despite 571,405 xdp_rx_ring_full events, with no ownership or data errors.
Quoted source text, attributed separately from HOL analysis.