{"id":"CVE-2026-68156","summary":"libceph: refresh auth-\u003eauthorizer_buf{,_len} after authorizer update","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: refresh auth-\u003eauthorizer_buf{,_len} after authorizer update\n\nceph_x_create_authorizer() caches au-\u003ebuf-\u003evec.iov_base and\nau-\u003ebuf-\u003evec.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-\u003ebuf 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-\u003eauthorizer_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-\u003eauthorizer_buf and auth-\u003eauthorizer_buf_len after a\nsuccessful authorizer rebuild so the messenger sends the current\nbuffer.","modified":"2026-08-12T04:19:21.593689601Z","published":"2026-08-10T11:59:22.514Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68156.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68156.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68156"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0bed9b5c523d577378b6f83eab5835fe30c27208"},{"fixed":"9d37aec9ffe4e743dabc3f84502e9723e17a30d4"},{"fixed":"75e82e8944ac1efe9fdb88bd2f14d9a031282bdf"},{"fixed":"0060ec912292a550198d8d18ac95b433c92a7091"},{"fixed":"5ecfcd5c05866f185357700b81b461dae4f5ebb2"},{"fixed":"937d61f86d377a3aa578adae7a3dfcecdddf9d89"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"29c65a277a64645af853e8c9a9b3dda0ddc421e0"},{"last_affected":"d2c7223497cf8228416c70e3f4238ddd6c5bdf3c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.4.50"},{"fixed":"3.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.9.7"},{"fixed":"3.10"}]}],"versions":["v3.9.6","v3.4.49","v3.9.5","v3.4.48","v3.9.4","v3.4.47","v3.9","v3.9.3","v3.4.46","v3.9.2","v3.4.45","v3.4.44","v3.9.1","v3.4.43","v3.9-rc2","v3.9-rc7","v3.4.42","v3.9-rc8","v3.4.41","v3.9-rc3","v3.9-rc6","v3.9-rc5","v3.4.40","v3.4.39","v3.9-rc4","v3.9-rc1","v3.8","v3.4.38","v3.4.37","v3.4.36","v3.4.35","v3.4.34","v3.4.33","v3.8-rc7","v3.4.32","v3.8-rc6","v3.8-rc5","v3.4.31","v3.4.30","v3.8-rc2","v3.4.29","v3.4.28","v3.8-rc1","v3.8-rc3","v3.8-rc4","v3.4.27","v3.4.26","v3.4.25","v3.7","v3.4.24","v3.4.23","v3.7-rc1","v3.6","v3.7-rc6","v3.7-rc7","v3.4.22","v3.7-rc3","v3.7-rc8","v3.4.21","v3.4.20","v3.7-rc2","v3.4.19","v3.7-rc4","v3.7-rc5","v3.4.18","v3.4.17","v3.4.16","v3.4.15","v3.4.14","v3.4.13","v3.6-rc7","v3.4.12","v3.6-rc1","v3.5-rc3","v3.4.11","v3.6-rc6","v3.6-rc5","v3.5","v3.6-rc3","v3.6-rc4","v3.6-rc2","v3.4.10","v3.4-rc4","v3.4.9","v3.4.8","v3.4.7","v3.4.6","v3.5-rc7","v3.5-rc5","v3.5-rc6","v3.4.5","v3.4.4","v3.5-rc2","v3.5-rc1","v3.5-rc4","v3.4","v3.4.3","v3.4.2","v3.4.1","v3.4-rc2","v3.4-rc1","v3.4-rc7","v3.4-rc6","v3.4-rc3","v3.4-rc5","v3.3","v3.3-rc6","v3.3-rc3","v3.3-rc7","v3.3-rc2","v3.3-rc5","v3.2","v3.3-rc4","v3.3-rc1","v3.2-rc4","v3.2-rc7","v3.2-rc6","v3.2-rc5","v3.2-rc3","v3.1","v3.2-rc2","v3.2-rc1","v3.1-rc1","v3.1-rc9","v3.1-rc8","v3.1-rc10","v3.1-rc7","v3.1-rc3","v3.1-rc2","v3.1-rc4","v3.1-rc5","v3.0","v3.1-rc6","v3.0-rc7","v3.0-rc4","v3.0-rc6","v3.0-rc5","v3.0-rc3","v3.0-rc1","v2.6.39","v3.0-rc2","v2.6.38","v2.6.39-rc2","v2.6.39-rc7","v2.6.39-rc5","v2.6.39-rc1","v2.6.38-rc7","v2.6.39-rc6","v2.6.39-rc4","v2.6.39-rc3","v2.6.37","v2.6.38-rc1","v2.6.38-rc8","v2.6.38-rc2","v2.6.38-rc6","v2.6.38-rc5","v2.6.38-rc4","v2.6.38-rc3","v2.6.37-rc4","v2.6.37-rc2","v2.6.36","v2.6.37-rc5","v2.6.37-rc8","v2.6.37-rc7","v2.6.37-rc6","v2.6.37-rc1","v2.6.37-rc3","v2.6.36-rc6","v2.6.35-rc4","v2.6.36-rc8","v2.6.35","v2.6.36-rc7","v2.6.36-rc3","v2.6.36-rc5","v2.6.36-rc4","v2.6.36-rc2","v2.6.36-rc1","v2.6.35-rc5","v2.6.35-rc6","v2.6.34","v2.6.35-rc3","v2.6.35-rc1","v2.6.35-rc2","v2.6.34-rc7","v2.6.34-rc6","v2.6.34-rc5","v2.6.34-rc4","v2.6.34-rc3","v2.6.34-rc2","v2.6.34-rc1","v2.6.33","v2.6.33-rc6","v2.6.33-rc8","v2.6.33-rc4","v2.6.33-rc5","v2.6.33-rc3","v2.6.33-rc7","v2.6.33-rc2","v2.6.32","v2.6.33-rc1","v2.6.32-rc8","v2.6.32-rc7","v2.6.32-rc6","v2.6.31","v2.6.32-rc5","v2.6.32-rc4","v2.6.32-rc2","v2.6.32-rc1","v2.6.32-rc3","v2.6.31-rc9","v2.6.31-rc1","v2.6.31-rc7","v2.6.31-rc8","v2.6.31-rc6","v2.6.30-rc6","v2.6.30","v2.6.31-rc4","v2.6.31-rc5","v2.6.31-rc3","v2.6.31-rc2","v2.6.30-rc7","v2.6.30-rc8","v2.6.30-rc5","v2.6.30-rc3","v2.6.30-rc4","v2.6.30-rc1","v2.6.30-rc2","v2.6.29","v2.6.29-rc8","v2.6.29-rc7","v2.6.29-rc5","v2.6.29-rc1","v2.6.29-rc6","v2.6.29-rc4","v2.6.29-rc3","v2.6.29-rc2","v2.6.28","v2.6.28-rc7","v2.6.28-rc9","v2.6.28-rc8","v2.6.28-rc6","v2.6.28-rc5","v2.6.28-rc4","v2.6.28-rc2","v2.6.28-rc3","v2.6.28-rc1","v2.6.27","v2.6.27-rc7","v2.6.27-rc9","v2.6.27-rc8","v2.6.27-rc5","v2.6.27-rc6","v2.6.27-rc4","v2.6.27-rc1","v2.6.27-rc3"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