{"cve":"CVE-2026-23460","nvd":{"published":"2026-04-03T16:16:32.963","modified":"2026-07-24T22:10:00.140","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/rose: fix NULL pointer dereference in rose_transmit_link on reconnect\n\nsyzkaller reported a bug [1], and the reproducer is available at [2].\n\nROSE sockets use four sk->sk_state values: TCP_CLOSE, TCP_LISTEN,\nTCP_SYN_SENT, and TCP_ESTABLISHED. rose_connect() already rejects\ncalls for TCP_ESTABLISHED (-EISCONN) and TCP_CLOSE with SS_CONNECTING\n(-ECONNREFUSED), but lacks a check for TCP_SYN_SENT.\n\nWhen rose_connect() is called a second time while the first connection\nattempt is still in progress (TCP_SYN_SENT), it overwrites\nrose->neighbour via rose_get_neigh(). If that returns NULL, the socket\nis left with rose->state == ROSE_STATE_1 but rose->neighbour == NULL.\nWhen the socket is subsequently closed, rose_release() sees\nROSE_STATE_1 and calls rose_write_internal() ->\nrose_transmit_link(skb, NULL), causing a NULL pointer dereference.\n\nPer connect(2), a second connect() while a connection is already in\nprogress should return -EALREADY. Add this missing check for\nTCP_SYN_SENT to complete the state validation in rose_connect().\n\n[1] https://syzkaller.appspot.com/bug?extid=d00f90e0af54102fb271\n[2] https://gist.github.com/mrpre/9e6779e0d13e2c66779b1653fef80516","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/0c3e8bff808f17ad37a51d8e719eed22c7863120","https://git.kernel.org/stable/c/0c9fb70a206a8734e10468ecc24d57c7596cf64e","https://git.kernel.org/stable/c/508f49ccbe0329641bb681f7d0052bb4e5943252","https://git.kernel.org/stable/c/a12254050e3050f1011cd24f3b880a6882d0139d","https://git.kernel.org/stable/c/a753844d2a8136f090123c8fb1ff6c7f6ee7c2b3"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:28:59.047572785+00:00"},"epss":{"cve":"CVE-2026-23460","score":0.00128,"percentile":0.02408,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}