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CVE-2026-74563— rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.19及之后版本存在安全漏洞，该漏洞源于rds_tcp_laddr_check()函数在调用ipv6_chk_addr()前过早释放RCU读锁，可能导致并发删除链路时释放net_device，造成释放后重用，进而导致系统崩溃或信息泄露。

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< f8a8977af2134a1d91e5f9773cb7d9d53278c830 affected
eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< ba95bce5dfe6e2ef602a87e0557225f2934ccb5c affected
eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< c4933624a6f416ecfcc31ab58d585da1207a0597 affected
eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< 76dd48886eeeb5fcf2b837d2f4c3d17eebeac9ef affected
eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< f0d1fb05d70c8a561cd8d0473bcacafa2fc137ff affected
eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< b1d480fce05f857dc438080cd8c9244b84a83494 affected
eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< 8398bc477d3cb3e2b018a5aaac2bec0f69acda30 affected
eee2fa6ab3225192d6d894c54a6fb02ac9efdff6< 78f75d632f74b8de0f081a128588f7c37d0d1164 affected
… +10 more rows
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I. Basic Information for CVE-2026-74563

Vulnerability Information
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Vulnerability Title
rds: tcp: hold the RCU lock across ipv6_chk_addr() in rds_tcp_laddr_check()
Source: CVE Program / CVE List V5
Vulnerability 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)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.19及之后版本存在安全漏洞，该漏洞源于rds_tcp_laddr_check()函数在调用ipv6_chk_addr()前过早释放RCU读锁，可能导致并发删除链路时释放net_device，造成释放后重用，进而导致系统崩溃或信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux eee2fa6ab3225192d6d894c54a6fb02ac9efdff6 ~ f8a8977af2134a1d91e5f9773cb7d9d53278c830 -
Linux Linux 4.19 -

II. Public POCs for CVE-2026-74563

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III. Intelligence Information for CVE-2026-74563

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Patches & Fixes for CVE-2026-74563 (7)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-74267 9.8 CRITICAL net/sched: sch_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring q
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74563

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