{ "cveId": "CVE-2026-98021", "url": "https://patchblox.com/security/cve/CVE-2026-98021", "summary": "CVE-2026-98021 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-98021, released September 29, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "net: reject oversized tx_queue_len at netlink parse time", "description": "In the Linux kernel, the following vulnerability has been resolved: net: reject oversized tx_queue_len at netlink parse time rtnl_create_link() assigns IFLA_TXQLEN directly to dev-\u003Etx_queue_len without going through netif_change_tx_queue_len(), so a device created with \u0022ip link add ... txqueuelen 500000\u0022 bypasses the S16_MAX cap and still triggers the oversized ring allocations in pfifo_fast, tun and tap. The veth peer nest (rtnl_nla_parse_ifinfomsg()) and the RTM_NEWLINK-on-existing-device path reach the same sinks. Enforce the cap in ifla_policy instead: IFLA_TXQLEN becomes NLA_POLICY_FULL_RANGE(NLA_U32, \u0026txqlen_range) with txqlen_range = { .min = 0, .max = S16_MAX }. All netlink consumers parse against this policy - rtnl_setlink(), rtnl_newlink() (create and change), and the veth peer nest - so every netlink path is capped at parse time and rejects the attribute with -ERANGE plus a proper \u0022integer out of range\u0022 extack message before any device state is modified (the RTM_SETLINK half-application wart is gone with it). Document the bound in the rt-link.yaml netlink spec. Conditions to recreate the bug: - CONFIG_NET_SCHED=y, CONFIG_VETH=y, CONFIG_USER_NS=y, CONFIG_NET_NS=y. - Unprivileged user in a fresh user\u002Bnet namespace (unshare -Urn): ip link add v0 txqueuelen 500000 type veth peer name v1 -\u003E on the fixed kernel this is rejected with -ERANGE (\u0022integer out of range\u0022 extack) instead of installing an oversized tx_queue_len that later inflates pfifo_fast/tun/tap ring allocations. - ip link set v0 txqueuelen 500000 is likewise rejected at parse time.", "published": "2026-09-25T11:17:30Z", "severity": "Moderate", "cvss": 7.8, "epss": 0.00176, "epssPercentile": 0.07167, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98021", "fixes": [ { "platform": "linux", "product": "bpftool6.12", "release": "amzn 2023", "fixedVersion": "1:6.12.111-136.204.amzn2023", "fix": "ALAS2023-2026-3193", "url": 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