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CVE-2026-68320— sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid

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存在安全漏洞，该漏洞源于sctp_auth_ep_add_chunkid函数对认证块列表容量检查不当，导致在添加超过16个认证块时memcpy溢出目标缓冲区，可能造成缓冲区溢出。

CVSS 7.3 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1f485649f52929d9937b346a920a522a7363e202< 3d22a7da2e264f407c729f33a0a346ff76108bc6 affected
1f485649f52929d9937b346a920a522a7363e202< 6837c1c19a259518974cbc5a52017646e3906564 affected
1f485649f52929d9937b346a920a522a7363e202< 54bb4c03fa17cdcb157c26c33e60a78cf32960f5 affected
1f485649f52929d9937b346a920a522a7363e202< 5a365f1e423444c5da7eb689a8661633dad43e48 affected
1f485649f52929d9937b346a920a522a7363e202< 886e28e14ab655012779016d251fef53d103aa12 affected
1f485649f52929d9937b346a920a522a7363e202< 11092d79eb2b7c0068382f72fc2416d1786bb2e0 affected
1f485649f52929d9937b346a920a522a7363e202< b6ea3dda09eb4d5caf7bbc00f857688cf9e98255 affected
1f485649f52929d9937b346a920a522a7363e202< ff04b26794a16a8a879eb4fd2c02c2d6b03850e9 affected
… +10 more rows
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I. Basic Information for CVE-2026-68320

Vulnerability Information
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Vulnerability Title
sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid sctp_auth_ep_add_chunkid() uses SCTP_NUM_CHUNK_TYPES (20) as the capacity limit for ep->auth_chunk_list, allowing it to hold up to 20 chunk entries (param_hdr.length up to 24). However, the copy destination asoc->c.auth_chunks in struct sctp_cookie is only SCTP_AUTH_MAX_CHUNKS (16) entries (20 bytes). When more than 16 chunks are added, sctp_association_init() memcpy overflows the destination by up to 4 bytes. Fix by using SCTP_AUTH_MAX_CHUNKS as the capacity limit, matching the destination capacity.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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存在安全漏洞，该漏洞源于sctp_auth_ep_add_chunkid函数对认证块列表容量检查不当，导致在添加超过16个认证块时memcpy溢出目标缓冲区，可能造成缓冲区溢出。
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 1f485649f52929d9937b346a920a522a7363e202 ~ 3d22a7da2e264f407c729f33a0a346ff76108bc6 -
Linux Linux 2.6.24 -

II. Public POCs for CVE-2026-68320

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III. Intelligence Information for CVE-2026-68320

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Patches & Fixes for CVE-2026-68320 (6)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68320

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