{"schema":"threatline.record/2","record":{"id":"CVE-2026-99079","aliases":[],"summary":"net/mlx5e: Prevent stale XSK buffer release on refill retry","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Prevent stale XSK buffer release on refill retry\n\nWhen an XDP redirect to an AF_XDP socket fails because its RX ring is\nfull, the XSK core frees the buffer. During the subsequent batched refill\nof a legacy cyclic RQ, mlx5e also releases the WQE's XSK buffer before\nallocating a replacement. If that refill succeeds only partially, a WQE\nleft without a replacement retains its old buffer pointer.\n\nThe buffer can meanwhile be allocated to another WQE. A later refill\nretry can then free the live buffer through the stale pointer and publish\nthe same UMEM frame twice.\n\nMark the WQE as released immediately after the driver-side free. The flag\nis already cleared when a replacement buffer is assigned, so refill\nretries no longer release stale pointers.\n\nThe failure is silent and produces no kernel warning or splat. A\nstandalone legacy cyclic-RQ zero-copy libxsk reproducer, using 64-byte UDP\ntraffic offered at 12 Mpps, detected it: stock stopped after 2,854,914\npackets in 4.094 seconds, with 4,542 xdp_rx_ring_full events and 64\nownership/double-publication errors. With this change it processed\n356,904,225 packets in 30 seconds despite 571,405 xdp_rx_ring_full events,\nwith no ownership or data errors.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99079","source_modified_at":"2026-10-23T12:23:26.458Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"3f93f82988bc6b4104314bf9aa485d47fbb7e241","lessThan":"32bbb870078d467479965c21bbc4960c57eea208","status":"affected","versionType":"git"},{"version":"3f93f82988bc6b4104314bf9aa485d47fbb7e241","lessThan":"34d1db2b18e1c1d189e34dd51923e031815f88e3","status":"affected","versionType":"git"},{"version":"3f93f82988bc6b4104314bf9aa485d47fbb7e241","lessThan":"639522e5056cade578a324acfa993ec6c9f7f5dc","status":"affected","versionType":"git"},{"version":"3f93f82988bc6b4104314bf9aa485d47fbb7e241","lessThan":"655f47477054d19de3b138840be229a1a4490d0c","status":"affected","versionType":"git"},{"version":"3f93f82988bc6b4104314bf9aa485d47fbb7e241","lessThan":"e01620844c5c88b6fcf819d171df8e3976a0e76f","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99079","source_modified_at":"2026-10-23T12:23:26.458Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.4","status":"affected"},{"version":"0","lessThan":"6.4","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99079","source_modified_at":"2026-10-23T12:23:26.458Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"32bbb870078d467479965c21bbc4960c57eea208","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99079","source_modified_at":"2026-10-23T12:23:26.458Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"34d1db2b18e1c1d189e34dd51923e031815f88e3","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99079","source_modified_at":"2026-10-23T12:23:26.458Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"639522e5056cade578a324acfa993ec6c9f7f5dc","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99079","source_modified_at":"2026-10-23T12:23:26.458Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"655f47477054d19de3b138840be229a1a4490d0c","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:23:26.458Z","modified_at":"2026-10-23T12:23:26.458Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99079","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:23:26.458Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/32bbb870078d467479965c21bbc4960c57eea208"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/34d1db2b18e1c1d189e34dd51923e031815f88e3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/639522e5056cade578a324acfa993ec6c9f7f5dc"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/655f47477054d19de3b138840be229a1a4490d0c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e01620844c5c88b6fcf819d171df8e3976a0e76f"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:23:26.458Z","content_hash":"e7f66a69b3d098438b9c14a9f062d6e3c757c9b1fb67e04d823b16af3f46a7d2"}}