CVE-2026-68156Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: libceph: refresh auth->authorizer_buf{,_len} after authorizer update ceph_x_create_authorizer() caches au->buf->vec.iov_base and au->buf->vec.iov_len in struct ceph_au…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
In the Linux kernel, the following vulnerability has been resolved:
libceph: refresh auth->authorizer_buf{,_len} after authorizer update
ceph_x_create_authorizer() caches au->buf->vec.iov_base and au->buf->vec.iov_len in struct ceph_auth_handshake. These cached values are then used by the messenger connect code when sending the authorizer.
ceph_x_update_authorizer() can rebuild the authorizer when a newer service ticket is available. If the rebuilt authorizer no longer fits in the existing buffer, ceph_x_build_authorizer() drops its reference to au->buf and allocates a new one. If this is the final reference, ceph_buffer_put() frees the old ceph_buffer and its vec.iov_base, but auth->authorizer_buf still points at that freed memory.
A subsequent msgr1 reconnect can therefore queue the stale pointer and trigger a KASAN slab-use-after-free in _copy_from_iter() while tcp_sendmsg() copies the authorizer.
Refresh auth->authorizer_buf and auth->authorizer_buf_len after a successful authorizer rebuild so the messenger sends the current buffer.
Linux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 2334e9997308305ee4fd508fdfe6086c4150ed60Linux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 79a273df64238a4ade8b709689a78589f755b8efLinux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 26f814187abceee90dbb29a02133adb4786fbb13Linux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 9d37aec9ffe4e743dabc3f84502e9723e17a30d4Linux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 75e82e8944ac1efe9fdb88bd2f14d9a031282bdfLinux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 0060ec912292a550198d8d18ac95b433c92a7091Linux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 5ecfcd5c05866f185357700b81b461dae4f5ebb2Linux >= 0bed9b5c523d577378b6f83eab5835fe30c27208 < 937d61f86d377a3aa578adae7a3dfcecdddf9d89Linux 29c65a277a64645af853e8c9a9b3dda0ddc421e0Linux d2c7223497cf8228416c70e3f4238ddd6c5bdf3cLinux >= 3.4.50 < 3.5Linux >= 3.9.7 < 3.10Linux 3.10Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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