libceph: refresh auth->authorizer_buf{,_len} after authorizer update

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68156
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:01 UTC
Updated2026-08-19 17:20:32 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.006080000 probability, percentile 0.464590000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 2334e9997308305ee4fd508fdfe6086c4150ed60 git Not specified
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 79a273df64238a4ade8b709689a78589f755b8ef git Not specified
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 26f814187abceee90dbb29a02133adb4786fbb13 git Not specified
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 9d37aec9ffe4e743dabc3f84502e9723e17a30d4 git Not specified
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 75e82e8944ac1efe9fdb88bd2f14d9a031282bdf git Not specified
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 0060ec912292a550198d8d18ac95b433c92a7091 git Not specified
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 5ecfcd5c05866f185357700b81b461dae4f5ebb2 git Not specified
CNA Linux Linux affected 0bed9b5c523d577378b6f83eab5835fe30c27208 937d61f86d377a3aa578adae7a3dfcecdddf9d89 git Not specified
CNA Linux Linux affected 29c65a277a64645af853e8c9a9b3dda0ddc421e0 git Not specified
CNA Linux Linux affected d2c7223497cf8228416c70e3f4238ddd6c5bdf3c git Not specified
CNA Linux Linux affected 3.4.50 3.5 semver Not specified
CNA Linux Linux affected 3.9.7 3.10 semver Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2334e9997308305ee4fd508fdfe6086c4150ed60 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79a273df64238a4ade8b709689a78589f755b8ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26f814187abceee90dbb29a02133adb4786fbb13 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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