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CVE-2026-64576— nexthop: initialize extack in nh_res_bucket_migrate()

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基金会开源的一款操作系统内核。 Linux kernel 5.13版本存在安全漏洞，该漏洞源于nh_res_bucket_migrate()函数将未初始化的netlink_ext_ack传递给call_nexthop_res_bucket_notifiers()，当内存分配失败时错误路径引用未初始化的栈内存，可能导致内核崩溃。

CVSS 7.1 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 7c37c7e00411b3d1e0c5292368317aca69d1f324< eacd2e2117e8682f937967fda1022e7f1c22d91a affected
7c37c7e00411b3d1e0c5292368317aca69d1f324< 37bbd7e1d8df0bec3d187e961783e20c30533d2c affected
7c37c7e00411b3d1e0c5292368317aca69d1f324< c0936c131a71657afc635d0db2ab096d15d473e1 affected
7c37c7e00411b3d1e0c5292368317aca69d1f324< 3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d affected
7c37c7e00411b3d1e0c5292368317aca69d1f324< d536bf205c71f700f6de2086038c3e1d77724715 affected
7c37c7e00411b3d1e0c5292368317aca69d1f324< 18506d7263768d76ac8e057ba55a4d9da50aad66 affected
7c37c7e00411b3d1e0c5292368317aca69d1f324< 6347c5314cee49f364aaf2e40ff15415a57a116e affected
5.13 affected
… +8 more rows
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I. Basic Information for CVE-2026-64576

Vulnerability Information
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Vulnerability Title
nexthop: initialize extack in nh_res_bucket_migrate()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nexthop: initialize extack in nh_res_bucket_migrate() nh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to call_nexthop_res_bucket_notifiers(). When nh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns -ENOMEM), the error is propagated back before any notifier sets extack._msg, and the error path formats the stale pointer with pr_err_ratelimited("%s\n", extack._msg). With CONFIG_INIT_STACK_NONE this dereferences uninitialized stack memory: Oops: general protection fault, probably for non-canonical address ... KASAN: maybe wild-memory-access in range [...] RIP: 0010:string (lib/vsprintf.c:730) vsnprintf (lib/vsprintf.c:2945) _printk (kernel/printk/printk.c:2504) nh_res_bucket_migrate (net/ipv4/nexthop.c:1816) nh_res_table_upkeep (net/ipv4/nexthop.c:1866) rtm_new_nexthop (net/ipv4/nexthop.c:3323) rtnetlink_rcv_msg (net/core/rtnetlink.c:7076) netlink_sendmsg (net/netlink/af_netlink.c:1900) Kernel panic - not syncing: Fatal exception Zero-initialize extack so _msg is NULL on error paths that never set it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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基金会开源的一款操作系统内核。 Linux kernel 5.13版本存在安全漏洞，该漏洞源于nh_res_bucket_migrate()函数将未初始化的netlink_ext_ack传递给call_nexthop_res_bucket_notifiers()，当内存分配失败时错误路径引用未初始化的栈内存，可能导致内核崩溃。
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 7c37c7e00411b3d1e0c5292368317aca69d1f324 ~ eacd2e2117e8682f937967fda1022e7f1c22d91a -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-64576

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III. Intelligence Information for CVE-2026-64576

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Patches & Fixes for CVE-2026-64576 (6)

Same Patch Batch · Linux · 2026-08-05 · 17 CVEs total

CVE-2026-64566 9.8 CRITICAL xfrm: iptfs: propagate SKBFL_SHARED_FRAG in iptfs_skb_add_frags()
CVE-2026-64578 8.2 HIGH ksmbd: validate compound request size before reading StructureSize2
CVE-2026-64567 7.8 HIGH btrfs: reject free space cache with more entries than pages
CVE-2026-64568 7.8 HIGH wifi: mac80211: fix unsol_bcast_probe_resp double free on alloc failure
CVE-2026-64570 7.8 HIGH wifi: mac80211: fix fils_discovery double free on alloc failure
CVE-2026-64574 7.8 HIGH wifi: mac80211: tear down new links on vif update error path
CVE-2026-64575 7.8 HIGH bpf: tcp: fix double sock release on batch realloc
CVE-2026-64580 7.8 HIGH xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
CVE-2026-64581 7.8 HIGH xfrm: fix sk_dst_cache double-free in xfrm_user_policy()
CVE-2026-64582 7.8 HIGH RDMA/rxe: Fix a use-after-free problem in rxe_mmap
CVE-2026-64577 7.5 HIGH gtp: check skb_pull_data() return in gtp1u_send_echo_resp()
CVE-2026-64569 mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
CVE-2026-64571 wifi: p54: validate RX frame length in p54_rx_eeprom_readback()
CVE-2026-64572 ipv4: fib: free fib_alias with kfree_rcu() on insert error path
CVE-2026-64573 Bluetooth: qca: fix NVM tag length underflow in TLV parser
CVE-2026-64579 xfrm: policy: preallocate inexact bins before xfrm_hash_rebuild reinsert

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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