{
  "cveId": "CVE-2026-74562",
  "url": "https://patchblox.com/security/cve/CVE-2026-74562",
  "summary": "CVE-2026-74562 is fixed in linux on 1 platform by DEBIAN-CVE-2026-74562 (version 7.1.8-1), released August 16, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nexthop: take nh-\u003Elock for f6i_list walks in rep...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nexthop: take nh-\u003Elock for f6i_list walks in replace check and notify  fib6_check_nh_list() and __nexthop_replace_notify() walk nh-\u003Ef6i_list during an RTNL-serialized nexthop replace without holding nh-\u003Elock. IPv6 RTM_NEWROUTE/RTM_DELROUTE run without RTNL and mutate that list under nh-\u003Elock (fib6_add_rt2node_nh(), fib6_purge_rt()), so both walks race a concurrent route delete that unlinks and frees a fib6_info:    BUG: KASAN: slab-use-after-free in rt6_fill_node.isra.0 (net/ipv6/route.c:5799)   Read of size 4 at addr ffff888014607e64 by task exploit/143    rt6_fill_node.isra.0 (net/ipv6/route.c:5799)    fib6_rt_update (net/ipv6/route.c:6412)    __nexthop_replace_notify (net/ipv4/nexthop.c:2542)    rtm_new_nexthop (net/ipv4/nexthop.c:2554)    rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)    BUG: KASAN: slab-use-after-free in fib6_check_nh_list (net/ipv4/nexthop.c:1605)   Read of size 8 at addr ffff888014a7d068 by task exploit/142    fib6_check_nh_list (net/ipv4/nexthop.c:1605)    rtm_new_nexthop (net/ipv4/nexthop.c:2575)    rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)  Both walks only read the entries and take no tb6_lock, so protect them with nh-\u003Elock; fib6_rt_update() uses gfp_any(), which returns GFP_ATOMIC under the lock.",
  "published": "2026-08-15T13:18:01Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00116,
  "epssPercentile": 0.01589,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.8-1",
      "fix": "DEBIAN-CVE-2026-74562",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-74562",
      "released": "2026-08-16T22:48:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}