{"id":"CVE-2026-68156","revision":"0ac46462701e4ae9835aaf7d75692a10","records":[{"revision":"0ac46462701e4ae9835aaf7d75692a10","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-68156","aliases":[],"title":"libceph: refresh auth->authorizer_buf{,_len} after authorizer update","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.","state":0,"publishedAt":"2026-08-10T11:59:22.514+00:00","modifiedAt":"2026-10-19T20:58:54.796+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ceph/auth_x.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"2334e9997308305ee4fd508fdfe6086c4150ed60\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"79a273df64238a4ade8b709689a78589f755b8ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"26f814187abceee90dbb29a02133adb4786fbb13\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"9d37aec9ffe4e743dabc3f84502e9723e17a30d4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"75e82e8944ac1efe9fdb88bd2f14d9a031282bdf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"0060ec912292a550198d8d18ac95b433c92a7091\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"5ecfcd5c05866f185357700b81b461dae4f5ebb2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0bed9b5c523d577378b6f83eab5835fe30c27208\",\n                            \"lessThan\": \"937d61f86d377a3aa578adae7a3dfcecdddf9d89\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"29c65a277a64645af853e8c9a9b3dda0ddc421e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d2c7223497cf8228416c70e3f4238ddd6c5bdf3c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3.4.50\",\n                            \"lessThan\": \"3.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.9.7\",\n                            \"lessThan\": \"3.10\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ceph/auth_x.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.265\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.148\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.42\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.6\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 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,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/2334e9997308305ee4fd508fdfe6086c4150ed60","https://git.kernel.org/stable/c/79a273df64238a4ade8b709689a78589f755b8ef","https://git.kernel.org/stable/c/26f814187abceee90dbb29a02133adb4786fbb13","https://git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4","https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf","https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091","https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2","https://git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68156","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-68156","identifiers":["CVE-2026-68156"]},"retained":false,"historicalAffected":[]}],"coverage":[]}