{
  "cveId": "CVE-2026-74563",
  "url": "https://patchblox.com/security/cve/CVE-2026-74563",
  "summary": "CVE-2026-74563 is fixed in 72 products on 1 platform, first by DEBIAN-CVE-2026-74563, released August 16, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()  rds_tcp_laddr_check() looks up a scoped IPv6 interface with dev_get_by_index_rcu(), drops the RCU read-side lock, and only then passes the bare struct net_device * into ipv6_chk_addr().  dev_get_by_index_rcu() only keeps the device alive within the same RCU read-side section. After rcu_read_unlock(), a concurrent RTM_DELLINK can free the net_device; ipv6_chk_addr() then dereferences the stale pointer in __ipv6_chk_addr_and_flags() (e.g. l3mdev_master_dev_rcu(dev)), reading freed memory.  Keep the RCU read-side lock held across the ipv6_chk_addr() call instead of dropping it right after the lookup, so the device cannot be freed while it is in use.    BUG: KASAN: slab-use-after-free in __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998)   Read of size 8 at addr ffff8880106ec000 by task exploit/153   Call Trace:    ...    kasan_report (mm/kasan/report.c:595)    __ipv6_chk_addr_and_flags (... net/ipv6/addrconf.c:1998)    ipv6_chk_addr (net/ipv6/addrconf.c:2031 net/ipv6/addrconf.c:1972)    rds_tcp_laddr_check (net/rds/tcp.c:370)    rds_bind (net/rds/bind.c:248)    __sys_bind (net/socket.c:1920)    __x64_sys_bind (net/socket.c:1956)    do_syscall_64 (arch/x86/entry/syscall_64.c:63)    entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)",
  "published": "2026-08-15T13:18:01Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00117,
  "epssPercentile": 0.01697,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74563",
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