{"id":14861,"date":"2026-09-04T19:02:15","date_gmt":"2026-09-04T11:02:15","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-53392"},"modified":"2026-09-04T19:02:15","modified_gmt":"2026-09-04T11:02:15","slug":"cve-2026-53392","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-53392","title":{"rendered":"CVE-2026-53392 [HIGH] &#8211; In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4\/flexfiles: reje"},"content":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>NFSv4\/flexfiles: reject zero filehandle version count<\/p>\n<p>ff_layout_alloc_lseg() decodes the filehandle-version array count<br \/>\nfrom the flexfiles layout body. The value is used as the count for<br \/>\nkzalloc_objs(), and the current code only rejects NULL.<\/p>\n<p>A zero count yields ZERO_SIZE_PTR, which can be stored in<br \/>\ndss_info-&gt;fh_versions even though later flexfiles paths assume that at<br \/>\nleast one filehandle version exists.<\/p>\n<p>Reject fh_count == 0 before the allocation, matching the existing zero<br \/>\nversion_count validation in the flexfiles GETDEVICEINFO parser.<\/p>\n<p>A QEMU\/KASAN run with a malformed flexfiles layout hit:<\/p>\n<p>  KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]<br \/>\n  RIP: 0010:ff_layout_encode_ff_layoutupdate.isra.0+0x15f\/0x750<br \/>\n  ff_layout_encode_layoutreturn+0x683\/0x970<br \/>\n  nfs4_xdr_enc_layoutreturn+0x278\/0x3a0<br \/>\n  Kernel panic &#8211; not syncing: Fatal exception<\/p>\n<p>The patched kernel rejects the malformed layout without KASAN\/oops\/panic,<br \/>\nand a valid fh_count=1 regression still opens, reads, and unmounts cleanly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>NFSv4\/flexfiles: reject zero filehandle version count<\/p>\n<p>ff_layout_alloc_lseg() decodes the filehandle-version array count<br \/>\nfrom the f<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14861","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}