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CVE-2026-80637— netfilter: synproxy: fix unaligned memory access in timestamp adjustment

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.

在 Linux 内核中，以下漏洞已得到修复： netfilter: synproxy: 修复时间戳调整中的非对齐内存访问问题 通过使用 和 安全地读取和写入时间戳字段。这避免了因非对齐内存访问导致的性能下降，甚至避免了在严格要求内存对齐的架构上发生崩溃。 该修复遵循网络栈中时间戳解析的实现方式，参考了 和 的处理逻辑。

CVSS 7.5 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 48b1de4c110a7afa4b85862f6c75af817db26fad< 2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4 affected
48b1de4c110a7afa4b85862f6c75af817db26fad< 5c9c67cf7a3d16051dfb90e98836f530964dfb8e affected
48b1de4c110a7afa4b85862f6c75af817db26fad< ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7 affected
48b1de4c110a7afa4b85862f6c75af817db26fad< 992c20bc8a4aba220c8b95b467d049289778dad6 affected
3.12 affected
< 3.12 unaffected
6.12.97≤ 6.12.* unaffected
6.18.40≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-80637

Vulnerability Information
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Vulnerability Title
netfilter: synproxy: fix unaligned memory access in timestamp adjustment
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: fix unaligned memory access in timestamp adjustment Use get_unaligned_be32() and put_unaligned_be32() to safely read and write the timestamp fields. This prevents performance degradation due to unaligned memory access or even a crash on strict alignment architectures. This follows the implementation of timestamp parsing in the networking stack at tcp_parse_options() and synproxy_parse_options().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 48b1de4c110a7afa4b85862f6c75af817db26fad ~ 2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4 -
Linux Linux 3.12 -

II. Public POCs for CVE-2026-80637

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III. Intelligence Information for CVE-2026-80637

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Patches & Fixes for CVE-2026-80637 (4)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80721 8.8 HIGH Bluetooth: ISO: ensure no dangling hcon references in iso_conn
CVE-2026-80722 8.8 HIGH wifi: mac80211: validate individual TWT params before driver setup
CVE-2026-80724 8.8 HIGH ptp: vmclock: prevent read-only mappings from becoming writable

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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