CVE-2026-68156libceph: refresh auth->authorizer_buf{,_len} after authorizer update
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 2334e9997308305ee4fd508fdfe6086c4150ed60; from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 79a273df64238a4ade8b709689a78589f755b8ef; from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 26f814187abceee90dbb29a02133adb4786fbb13; from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 9d37aec9ffe4e743dabc3f84502e9723e17a30d4; from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 75e82e8944ac1efe9fdb88bd2f14d9a031282bdf; from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 0060ec912292a550198d8d18ac95b433c92a7091; from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 5ecfcd5c05866f185357700b81b461dae4f5ebb2; from 0bed9b5c523d577378b6f83eab5835fe30c27208 before 937d61f86d377a3aa578adae7a3dfcecdddf9d89; and 4 more ranges | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.