{"cve":"CVE-2026-68156","nvd":{"published":"2026-08-10T13:20:01.780","modified":"2026-10-19T21:17:55.677","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: refresh auth->authorizer_buf{,_len} after authorizer update\n\nceph_x_create_authorizer() caches au->buf->vec.iov_base and\nau->buf->vec.iov_len in struct ceph_auth_handshake.  These\ncached values are then used by the messenger connect code when\nsending the authorizer.\n\nceph_x_update_authorizer() can rebuild the authorizer when a newer\nservice ticket is available.  If the rebuilt authorizer no longer\nfits in the existing buffer, ceph_x_build_authorizer() drops its\nreference to au->buf and allocates a new one.  If this is the final\nreference, ceph_buffer_put() frees the old ceph_buffer and its\nvec.iov_base, but auth->authorizer_buf still points at that freed\nmemory.\n\nA subsequent msgr1 reconnect can therefore queue the stale pointer\nand trigger a KASAN slab-use-after-free in _copy_from_iter() while\ntcp_sendmsg() copies the authorizer.\n\nRefresh auth->authorizer_buf and auth->authorizer_buf_len after a\nsuccessful authorizer rebuild so the messenger sends the current\nbuffer.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091","https://git.kernel.org/stable/c/2334e9997308305ee4fd508fdfe6086c4150ed60","https://git.kernel.org/stable/c/26f814187abceee90dbb29a02133adb4786fbb13","https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2","https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:56:58.798400159+00:00"},"epss":{"cve":"CVE-2026-68156","score":0.00694,"percentile":0.52662,"date":"2026-10-25"},"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."]}