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              "value": "AV:N - The vulnerable XFS xattr add path is reachable locally via setxattr/fsetxattr, and also remotely on XFS-backed network file servers through in-kernel nfsd NFSv4 SETXATTR and ksmbd xattr/ACL operations that call into vfs_setxattr. Scoring the most severe reasonable deployment, a network file server exposes this over the network.\nAC:L - The attacker controls the xattr names, values, and operation sequence needed to shape the leaf freemap state; this is not a race and does not depend on conditions outside attacker control. The fsstress reproducer indicates the bug can be triggered by ordinary repeated xattr operations.\nPR:L - The attacker needs write permission to a file or directory on the affected XFS filesystem/export, but no administrative capability is required for user.* xattrs. This is basic user/share access rather than real root or CAP_SYS_ADMIN.\nUI:N - No victim action is required once the attacker has access to a writable XFS file or exported share. The attacker can invoke the xattr operation directly.\nS:U - The vulnerability corrupts XFS/kernel filesystem metadata within the same kernel security authority. It does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The bug causes attacker-controlled corruption of xattr leaf entries in a kernel metadata buffer, and those entries drive later xattr parsing offsets and namespace interpretation. Under the required uncertainty rule, this memory/metadata corruption is treated as potentially leveragable for high confidentiality impact.\nI:H - The faulty freemap lets xattr name/value data be allocated on top of the leaf entry array, corrupting XFS metadata and potentially access-control/security xattr state. This is attacker-controlled metadata corruption with documented data-loss potential, so integrity impact is High.\nA:H - The known failure mode trips XFS corruption assertions/verifiers and shuts down the filesystem. A remote or local write-capable attacker can repeat the operation to cause high availability impact."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL\n\nThe SCTP_SENDALL path in sctp_sendmsg() iterates ep-\u003easocs with\nlist_for_each_entry_safe(), which caches the next entry in @tmp before\nthe loop body runs.  The body calls sctp_sendmsg_to_asoc(), which may\ndrop the socket lock inside sctp_wait_for_sndbuf().\n\nWhile the lock is dropped, another thread can SCTP_SOCKOPT_PEELOFF the\nassociation cached in @tmp, migrating it to a new endpoint via\nsctp_sock_migrate() (list_del_init() + list_add_tail() to\nnewep-\u003easocs), and optionally close the new socket which frees the\nassociation via kfree_rcu().  The cached @tmp can also be freed by a\nnetwork ABORT for that association, processed in softirq while the\nlock is dropped.\n\nsctp_wait_for_sndbuf() revalidates @asoc (the current entry) on re-lock\nvia the \"sk != asoc-\u003ebase.sk\" and \"asoc-\u003ebase.dead\" checks, but nothing\nrevalidates @tmp.  After a successful return, the iterator advances to\nthe stale @tmp, yielding either a use-after-free (if the peeled socket\nwas closed) or a list-walk onto the new endpoint\u0027s list head (type\nconfusion of \u0026newep-\u003easocs as a struct sctp_association *).\n\nBoth are reachable from CapEff=0; the type-confusion path gives\ncontrolled indirect call via the outqueue.sched-\u003einit_sid pointer.\n\nFix by re-deriving @tmp from @asoc after sctp_sendmsg_to_asoc()\nreturns.  @asoc is known to still be on ep-\u003easocs at that point: the\nonly callers that list_del an association from ep-\u003easocs are\nsctp_association_free() (which sets asoc-\u003ebase.dead) and\nsctp_assoc_migrate() (which changes asoc-\u003ebase.sk), and\nsctp_wait_for_sndbuf() checks both under the lock before any\nsuccessful return; a tripped check propagates as err \u003c 0 and the loop\nbails before the re-derive.\n\nThe SCTP_ABORT path in sctp_sendmsg_check_sflags() returns 0 and the\nloop hits \u0027continue\u0027 before sctp_sendmsg_to_asoc() is ever called, so\nthe @tmp cached by list_for_each_entry_safe() still covers the\nlock-held free that ba59fb027307 (\"sctp: walk the list of asoc\nsafely\") was added for."
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              "value": "AV:L - The vulnerable code is reached via the sendmsg() syscall on a local SCTP socket, and the racing operation (SCTP_SOCKOPT_PEELOFF + close) is likewise a local syscall; no remote packet directly reaches the bug, so local access is required.\nAC:L - The attacker controls both sides of the race \u2014 shrinking SO_SNDBUF on its own socket reliably forces sctp_wait_for_sndbuf() to drop the lock and sleep, while a second thread peels off and closes the cached next association; per guidance an attacker-controlled race is Low.\nPR:L - The commit states both the UAF and type-confusion paths are \"reachable from CapEff=0\"; creating SCTP sockets and using sendmsg/PEELOFF requires no privileges, only a basic unprivileged local user.\nUI:N - The attacker performs all sendmsg, peeloff, and close operations itself; no victim action is required.\nS:U - The corruption (UAF / type confusion) stays within the kernel\u0027s own security authority and does not cross into a separate domain such as a VM host or IOMMU boundary.\nC:H - The use-after-free gives the attacker control over freed object contents and the type confusion reinterprets a list head as an association, both of which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The type-confusion path yields a controlled indirect call via the outqueue.sched-\u003einit_sid function pointer, providing a control-flow hijack / arbitrary-write-grade primitive for privilege escalation.\nA:H - Both the use-after-free and the type-confusion list walk readily cause kernel oops/panic, giving full availability loss."
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            "value": "RHSA-2026:33224: Red Hat Enterprise Linux BaseOS (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:23259: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26462: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"
          }
        ],
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            "time": "2026-05-26T15:07:49.955Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-26T00:00:00.000Z",
            "value": "Made public."
          }
        ],
        "title": "kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions",
        "workarounds": [
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            "lang": "en",
            "value": "See the security bulletin for a detailed mitigation procedure."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: reject userspace cifs.spnego descriptions\n\ncifs.spnego key descriptions contain authority-bearing fields such as\npid, uid, creduid, and upcall_target that cifs.upcall treats as\nkernel-originating inputs. However, userspace can also create keys of\nthis type through request_key(2) or add_key(2), allowing those fields to\nbe supplied without CIFS origin.\n\nOnly accept cifs.spnego descriptions while CIFS is using its private\nspnego_cred to request the key."
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    "dateUpdated": "2026-09-01T12:04:59.876Z",
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