CVE-2026-98123
UnknownSummary
A vulnerability in the Linux kernel's SCTP implementation causes a soft lockup due to inconsistent parameter iteration in ASCONF-ACK handling. A crafted ASCONF-ACK packet can trigger an infinite loop in softirq context, leading to a remote denial of service. Additionally, missing length validation for SCTP_PARAM_ERR_CAUSE allows an out-of-bounds read.
Risk Assessment
A remote attacker can cause a kernel soft lockup, resulting in system unavailability. The vulnerability can be exploited without authentication because the HMAC key with ID 0 is publicly known.
Recommendation
Apply the kernel patch immediately. If patching is not possible, restrict SCTP access to trusted networks and monitor kernel logs for soft lockup messages.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS