{"id":"CVE-2022-49296","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix possible deadlock when holding Fwb to get inline_data\n\n1, mount with wsync.\n2, create a file with O_RDWR, and the request was sent to mds.0:\n\n   ceph_atomic_o…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix possible deadlock when holding Fwb to get inline_data\n\n1, mount with wsync.\n2, create a file with O_RDWR, and the request was sent to mds.0:\n\n   ceph_atomic_o…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-667","CWE-667"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.34, < 5.18.4"],"patched":["linux_kernel 5.18.4"],"published":"2025-02-26","updated":"2026-08-13","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2022-49296","references":[{"url":"https://git.kernel.org/stable/c/292b7a7275ce535a1abfa4dd0b2e586162aaae1e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/825978fd6a0defc3c29d8a38b6cea76a0938d21e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.00171,"epssPercentile":0.06833,"ingestedAt":"2026-08-13T00:57:23.014Z","slug":"CVE-2022-49296","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix possible deadlock when holding Fwb to get inline_data\n\n1, mount with wsync.\n2, create a file with O_RDWR, and the request was sent to mds.0:\n\n   ceph_atomic_open()-->\n     ceph_mdsc_do_request(openc)\n     finish_open(file, dentry, ceph_open)-->\n       ceph_open()-->\n         ceph_init_file()-->\n           ceph_init_file_info()-->\n             ceph_uninline_data()-->\n             {\n               ...\n               if (inline_version == 1 || /* initial version, no data */\n                   inline_version == CEPH_INLINE_NONE)\n                     goto out_unlock;\n               ...\n             }\n\nThe inline_version will be 1, which is the initial version for the\nnew create file. And here the ci->i_inline_version will keep with 1,\nit's buggy.\n\n3, buffer write to the file immediately:\n\n   ceph_write_iter()-->\n     ceph_get_caps(file, need=Fw, want=Fb, ...);\n     generic_perform_write()-->\n       a_ops->write_begin()-->\n         ceph_write_begin()-->\n           netfs_write_begin()-->\n             netfs_begin_read()-->\n               netfs_rreq_submit_slice()-->\n                 netfs_read_from_server()-->\n                   rreq->netfs_ops->issue_read()-->\n                     ceph_netfs_issue_read()-->\n                     {\n                       ...\n                       if (ci->i_inline_version != CEPH_INLINE_NONE &&\n                           ceph_netfs_issue_op_inline(subreq))\n                         return;\n                       ...\n                     }\n     ceph_put_cap_refs(ci, Fwb);\n\nThe ceph_netfs_issue_op_inline() will send a getattr(Fsr) request to\nmds.1.\n\n4, then the mds.1 will request the rd lock for CInode::filelock from\nthe auth mds.0, the mds.0 will do the CInode::filelock state transation\nfrom excl --> sync, but it need to revoke the Fxwb caps back from the\nclients.\n\nWhile the kernel client has aleady held the Fwb caps and waiting for\nthe getattr(Fsr).\n\nIt's deadlock!\n\nURL: https://tracker.ceph.com/issues/55377\n\n## Affected\n\n- `linux_kernel >= 2.6.34, < 5.18.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.18.4`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}