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  - sctp: fix soft lockup from unpadded ASCONF-ACK parameter iteration sctp_verify_asconf() walks ASCONF-ACK     parameters with sctp_walk_params(), which advances by SCTP_PAD4(length), while the consumer     sctp_get_asconf_response() iterates the same parameters advancing by the raw length, without padding. A     single odd-length parameter desynchronises the two walks and makes the consumer interpret attacker-     controlled bytes at a misaligned offset. When those bytes yield a length of zero, the while loop over     asconf_ack_len makes no progress, spinning forever in softirq context, and the watchdog reports a soft     lockup. All reads stay within the received skb, so the lockup is a pure remote denial of service. A remote     peer can trigger it with a crafted ASCONF-ACK on an ADD-IP enabled association with an outstanding ASCONF     (RFC 5061 section 4.1.2 requires the chunk to be authenticated, but the predefined empty key id 0 allows     the peer to compute the same association HMAC from publicly exchanged parameters, so the gate does not     help). The SCTP_PARAM_ERR_CAUSE case of sctp_verify_asconf() also performs no length check, letting a     parameter without a complete error header reach the consumer, which reads errhdr.cause past the end of the     parameter, an out-of-bounds read. Reject SCTP_PARAM_ERR_CAUSE parameters shorter than sizeof(struct     sctp_addip_param) + sizeof(struct sctp_errhdr) at the verifier, and advance the consumer iterator with the     same padding rule as the verifier to keep the two walks in lockstep. The verifier change guarantees a     complete error header in every ERR_CAUSE parameter the consumer can see, so the consumer's asconf_ack_len     check is dropped and it returns err_param->cause directly. The consumer padding fix is still required     because odd lengths remain valid for SCTP_PARAM_ERR_CAUSE per RFC 5061. The issue was found by ZeroHive, a     vulnerability hunting agent at Tencent Yunding Lab. (CVE-2026-98123)

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Linux Distros Unpatched Vulnerability : CVE-2026-98123

medium Nessus Plugin ID 350355

Version 1.8

Version 1.7

Version 1.6

Version 1.5

Version 1.4

Version 1.3

Version 1.2

Version 1.1

Version 1.8 Nov 6, 2026, 2:22 PM CVSS metrics ("CVSSv2 score" set to 7.8. "CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C") CVSSv2 severity (based on CVE-2026-98123, severity increased from "Medium" to "High") Detection (updated detection logic) Plugin metadata Plugin Feed: 202611061422
Version 1.7 Nov 5, 2026, 5:43 PM CVSS metrics ("CVSSv2 score" set to 4.6. "CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C") CVSSv2 severity (based on CVE-2026-98123, severity decreased from "High" to "Medium") Plugin Feed: 202611051743
Version 1.6 Nov 4, 2026, 12:13 PM CVSS metrics ("CVSSv2 score" set to 7.8. "CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C") CVSSv2 severity (based on CVE-2026-98123, severity increased from "Medium" to "High") Detection (updated detection logic) Plugin metadata Plugin Feed: 202611041213
Version 1.5 Oct 23, 2026, 11:36 AM CVSS metrics ("CVSSv2 score" set to 4.6. "CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H". "CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C". "CVSSv3 score" set to 5.5) CVSSv2 severity (based on CVE-2026-98123, severity decreased from "High" to "Medium") Detection (updated detection logic) Plugin metadata Plugin Feed: 202610231136
Version 1.4 Oct 22, 2026, 12:02 AM CVSS metrics ("CVSSv2 score" set to 7.8) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C") Detection (updated detection logic) Plugin metadata Plugin Feed: 202610220002
Version 1.3 Oct 2, 2026, 6:07 PM Plugin metadata Detection (updated detection logic) Plugin Feed: 202610021807
Version 1.2 Sep 30, 2026, 6:31 AM CVSS metrics ("CVSSv2 score" set to 7.1) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C") Detection (updated detection logic) Plugin metadata Plugin Feed: 202609300631
Version 1.1 Sep 26, 2026, 2:30 AM New Plugin Feed: 202609260230