{ "schema_version": "1.6.1", "id": "RPI-CVE-2026-80527", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2026-80527" ], "published": "2026-08-26T14:37:59Z", "summary": "ceph: fix hanging __ceph_get_caps() with stale mds_wanted", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix hanging __ceph_get_caps() with stale mds_wanted\n\nA reader can hang forever in __ceph_get_caps() when the client no\nlonger holds `FILE_RD`, but local cap state still says that the\ncapability is already wanted (via `mds_wanted`).\n\nOne way to trigger this is through MDS cap revocation. If another\nclient performs a conflicting operation, the MDS can revoke `FILE_RD`\nfrom the reader; the next read then has to reacquire `FILE_RD`. If\nthe cap update that should request `FILE_RD` never reaches the MDS\nafter `cap->mds_wanted` was raised, the reader is left holding only\nnon-file caps while local `mds_wanted` still includes the file read\ncaps.\n\nIn that state, try_get_cap_refs() sees `need <= mds_wanted` and\nreturns 0, so __ceph_get_caps() just waits on `i_cap_wq`. If the cap\nupdate that was supposed to request `FILE_RD never reaches the MDS\nafter `cap->mds_wanted was` raised, no further request is sent and the\nwaiter can sleep indefinitely until unrelated cap traffic happens to\nwake it up.\n\nThe ordering issue is that `cap->mds_wanted` is updated in\n__prep_cap() before the `CEPH_MSG_CLIENT_CAPS message` is actually\nqueued for send. That makes one field serve two different meanings at\nonce: what this client wants, and what the client believes the MDS\nalready knows it wants.\n\nA proper fix would be to split those states and track whether a cap\nupdate is actually in flight or has been observed by the MDS.\nHowever, simply moving the `cap->mds_wanted assignment` later would\nnot be sufficient: queueing the message in the messenger does not\nguarantee that the MDS processed that specific wanted set, and\nreconnect or message loss can still invalidate that assumption.\nFixing that properly would require a larger rework of the cap state\nmachine.\n\nTo allow simpler backports to stable kernels, this patch implements a\nsimpler workaround:\n\n- stop waiting forever in __ceph_get_caps(); after a bounded wait,\n fall back to the renew path\n\n- make ceph_renew_caps() issue a synchronous `OPEN` request whenever\n the inode still does not actually hold the wanted caps, instead of\n only calling ceph_check_caps()\n\nThe extra issued-vs-wanted check in ceph_renew_caps() is necessary\nbecause the previous test only checked whether the inode still had any\nreal caps at all. That is not enough after revocation: the client can\nstill hold something like `pLs` and yet be missing `FILE_RD`\ncompletely. In that case, falling back to ceph_check_caps() is not\nsufficient, because it still trusts `cap->mds_wanted` and may resend\nnothing. By requiring `(issued & wanted) == wanted` before taking the\nasynchronous path, the code only uses ceph_check_caps() when the\n`wanted caps` are already actually issued. Otherwise, it sends the\nsynchronous `OPEN` renew.\n\nThis preserves the existing asynchronous fast path when the wanted\ncaps are already issued, avoids changing cap-state semantics, and\nfixes the hang by guaranteeing that a stalled waiter eventually\nretries through a path that does not rely on the stale `mds_wanted`\nstate.\n\n[ idryomov: move CEPH_GET_CAPS_WAIT_TIMEOUT from libceph.h to\n mds_client.h, formatting ]", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3", "1:6.6.62-1+rpt1", "1:6.6.74-1+rpt1", "1:6.12.20-1+rpt1~bpo12+1", "1:6.12.25-1+rpt1", "1:6.12.34-1+rpt1~bookworm", 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read/mmap/ioctl path into __ceph_get_caps().\nAC:L - The fix commit documents MDS cap revocation from another client as a reliable trigger; an attacker controls both sides by holding a second Ceph client session and driving conflicting I/O and reconnect/message-loss timing, without depending on uncontrollable victim heap layout or rare kernel configs.\nPR:N - Exploitation requires no Linux account, capability, or init-namespace root on the victim host; any remote (or co-tenant) Ceph client with write access to the shared file can induce revocation and the hang while victims only perform normal reads on an already-mounted cephfs export.\nUI:N - No interactive victim action is needed beyond routine automated reads on cephfs-backed workloads; the attacker does not require the victim to mount media, click a link, or perform a one-off administrative step at exploitation time.\nS:U - Impact is confined to threads blocked in __ceph_get_caps() on the same host kernel security domain; it does not cross VM, container, or IOMMU boundaries or grant elevated privileges beyond availability loss on the affected client.\nC:N - This is a capability wait-loop logic error with no out-of-bounds access, use-after-free, or information disclosure; stale mds_wanted only prevents cap reacquisition and does not read or leak kernel or file data to an attacker.\nI:N - The bug does not modify inode data, kernel memory, or capabilities; it causes indefinite sleeping in cap acquisition with no path to arbitrary write, metadata corruption, or code execution.\nA:H - Before the fix, __ceph_get_caps() could wait forever on i_cap_wq when mds_wanted falsely indicated FILE_RD was already requested but not issued, hanging the reader thread (read/write/mmap/getattr) until unrelated cap traffic; repeated exploitation can deny service to cephfs-backed applications." } } }