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CVE-2026-99128— sctp: validate chunk length in the inqueue parser

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： sctp：在入队解析器中验证数据块长度 SCTP 数据块始终包含一个四字节的通用头部，但 函数当前却接受更短的声明长度。若数据块长度为零， 指针将停留在当前头部位置。 当 ASCONF 数据块受关联的 SCTP-AUTH 策略覆盖时， 可能在状态机执行常规的数据块长度检查之前继续执行。此时， 会反复返回同一个畸形数据块，导致接收软中断（softirq）陷入死锁。 远程 SCTP 对等端可在建立关联后触发此漏洞，前提是该内核编译时启用了 ，且配置了 和 。该漏洞的复现脚本

AI Predicted 9.8 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux bbd0d59809f923ea2b540cbd781b32110e249f6e< 40507f59f230dcf60ae13cb48d34f8c6e9f40659 affected
bbd0d59809f923ea2b540cbd781b32110e249f6e< 9ac57e4c62e93c287b36080e5da3645690549990 affected
bbd0d59809f923ea2b540cbd781b32110e249f6e< 6cfc1b90cb86f4aabc69fb8e30128e07e2cdfa3a affected
2.6.24 affected
< 2.6.24 unaffected
6.18.59≤ 6.18.* unaffected
7.2.13≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-99128

Vulnerability Information
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Vulnerability Title
sctp: validate chunk length in the inqueue parser
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: validate chunk length in the inqueue parser SCTP chunks always include a four-byte generic header, but sctp_inq_pop() currently accepts shorter declared lengths. A zero-length chunk leaves chunk_end at the current header. When ASCONF is covered by the association's SCTP-AUTH policy, sctp_assoc_bh_rcv() can continue before the state machine performs its normal chunk-length check. sctp_inq_pop() then returns the same malformed chunk repeatedly and the receive softirq can lock up. A remote SCTP peer can trigger this after establishing an association on a kernel built with CONFIG_IP_SCTP and configured with net.sctp.addip_enable=1 and net.sctp.auth_enable=1. The reproducer did not require application credentials, a shared SCTP AUTH key, or net.sctp.addip_noauth_enable=1. On commit f967455fb2a5 ("seg6: reset IP6CB after IPv6 decapsulation"), one zero-length ASCONF caused repeated watchdog soft-lockup reports in a two-vCPU KVM guest. All 3 pre-trigger health probes succeeded, while 36 of 37 post-trigger probes failed. With this change, all 37 post-trigger probes succeeded and no equivalent soft-lockup signature appeared. Reject chunks shorter than the generic SCTP header at the shared inqueue parser boundary. Mark the packet for discard before either caller can continue processing it, while preserving the four-byte generic minimum. Declared-length 1 through 4 controls and kernel-generated ASCONF traffic remained healthy. The patched sctp_hello selftest passed for IPv4 and IPv6. The complete private reproducer and validation evidence are available directly to maintainers on request.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 bbd0d59809f923ea2b540cbd781b32110e249f6e ~ 40507f59f230dcf60ae13cb48d34f8c6e9f40659 -
Linux Linux 2.6.24 -

II. Public POCs for CVE-2026-99128

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III. Intelligence Information for CVE-2026-99128

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Patches & Fixes for CVE-2026-99128 (3)

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99144 sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue
CVE-2026-99130 io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131 xfs: fix capability check in xfs
CVE-2026-99133 net/iucv: fix the recvmsg window update
CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134 mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135 dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137 cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136 dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140 tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141 tracing: Fix crash in print_graph_function_event()
CVE-2026-99142 tracing: Check operator stack capacity before pushing
CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99156 scsi: st: Fix use-after-free race between st_remove() and st_open()
CVE-2026-99153 scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152 scsi: libiscsi: Validate the task named by a management response
CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions

Showing top 20 of 117 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux