CVE-2026-89635

CVE-2026-89635 is a use-after-free vulnerability in ksmbd , the Linux kernel's SMB server component. In ksmbd_reopen_durable_fd(), when a session reconnects with a durable-v2 handle, the code incorrectly rebinds all detached oplocks on the same inode to the reconnecting session, not just the one ...

CVE-2026-89635

In the Linux kernel, the following vulnerability has been resolved: ksmbd: only rebind the reopened file's own oplock on durable reconnect ksmbdreopendurablefd walks the inode's moplist and rebinds every detached oplock to the reconnecting session: listforeachentryrcuop, &ci-moplist, opentry,...

CVE-2026-89630 smb: client: restore the data_offset bound in is_valid_oplock_break()

In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the dataoffset bound in isvalidoplockbreak Commit 83bfbd0bb902 "cifs: Remove the RFC1002 header from smbhdr" changed the quantity this bound is measured against. It used to be srv-totalread minus the 4-byte...

EUVD-2026-76542

In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the dataoffset bound in isvalidoplockbreak Commit 83bfbd0bb902 "cifs: Remove the RFC1002 header from smbhdr" changed the quantity this bound is measured against. It used to be srv-totalread minus the 4-byte...

CVE-2026-89630 smb: client: restore the data_offset bound in is_valid_oplock_break()

In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the dataoffset bound in isvalidoplockbreak Commit 83bfbd0bb902 "cifs: Remove the RFC1002 header from smbhdr" changed the quantity this bound is measured against. It used to be srv-totalread minus the 4-byte...

CVE-2026-89630

In the Linux kernel, the following vulnerability has been resolved: smb: client: restore the dataoffset bound in isvalidoplockbreak Commit 83bfbd0bb902 "cifs: Remove the RFC1002 header from smbhdr" changed the quantity this bound is measured against. It used to be srv-totalread minus the 4-byte...

CVE-2026-80926 ksmbd: fix use-after-free in oplock break notification

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in oplock break notification smb2oplockbreaknoti reads opinfo-conn without any lock and dereferences it after two allocations which may sleep. When the durable handle owning the oplock is disconnected,...

CVE-2026-80926

CVE-2026-80926 is a use-after-free in the Linux kernel's ksmbd (in-kernel SMB server) module, in the smb2_oplock_break_noti() function. The function reads opinfo->conn without holding a lock and dereferences it after two allocations that may sleep. When the durable handle owning the oplock is ...

CVE-2026-80926 ksmbd: fix use-after-free in oplock break notification

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in oplock break notification smb2oplockbreaknoti reads opinfo-conn without any lock and dereferences it after two allocations which may sleep. When the durable handle owning the oplock is disconnected,...

EUVD-2026-76248

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in oplock break notification smb2oplockbreaknoti reads opinfo-conn without any lock and dereferences it after two allocations which may sleep. When the durable handle owning the oplock is disconnected,...

CVE-2026-80926

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in oplock break notification smb2oplockbreaknoti reads opinfo-conn without any lock and dereferences it after two allocations which may sleep. When the durable handle owning the oplock is disconnected,...

PT-2026-90346

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the SMB client where the data offset bound in the is valid oplock break function was incorrectly calculated. A change intended to remove the RFC1002 header from smb hd...

CVE-2026-89635: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: ksmbd: only rebind the reopened file's own oplock on durable reconnect ksmbdreopendurablefd walks the inode's moplist and rebinds every detached oplock to the reconnecting session: listforeachentryrcuop, &ci-moplist, opentry,...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-107281)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-107281 advisory. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2isvalidoplockbreak Skip sessions that are being teared down...

PT-2026-90351

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the ksmbd module where the ksmbd reopen durable fd function incorrectly rebinds all detached oplocks on an inode to a reconnecting session instead of only the oplock...

CVE-2026-80926: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in oplock break notification smb2oplockbreaknoti reads opinfo-conn without any lock and dereferences it after two allocations which may sleep. When the durable handle owning the oplock is disconnected,...

PT-2026-96558

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in oplock break notification smb2 oplock break noti reads opinfo-conn without any lock and dereferences it after two allocations which may sleep. When the durable handle owning the oplock is disconnected...

PT-2026-90056

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A use-after-free issue exists in the ksmbd component during oplock break notification. The function smb2 oplock break noti reads the opinfo-conn variable without a lock and dereferences ...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098747)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098747 advisory. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free in cifsoplockbreak A race condition can occur in cifsoplockbreak...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098694)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098694 advisory. In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF in smb2isvalidoplockbreak Skip sessions that are being teared down...