{"id":"CVE-2026-98126","revision":"5f5331cf2cad401f81a2900945b4b480","records":[{"revision":"5f5331cf2cad401f81a2900945b4b480","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98126","aliases":[],"title":"smb/client: validate new EOF for zero range","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: validate new EOF for zero range\n\nWhen FALLOC_FL_ZERO_RANGE is used without FALLOC_FL_KEEP_SIZE,\nsmb3_zero_range() may extend EOF without checking RLIMIT_FSIZE, allowing\nthe file to grow beyond the caller's file-size limit.\n\nFix this by calling inode_newsize_ok() before sending the zero-range\nrequest when the operation would extend EOF.\n\nReproducer, using a file on a CIFS mount:\n\n\tbash -c '\n\t        FILE=/mnt/cifs/repro\n\n\t        trap \"\" SIGXFSZ\n\t        ulimit -f 3072\n\n\t        truncate -s 2M \"$FILE\"\n\t        fallocate --zero-range -o 0 -l 4M \"$FILE\"\n\t        echo \"fallocate rc=$?\"\n\t        stat -c \"file size=%s\" \"$FILE\"\n\t'\n\nBefore this change, the operation succeeds despite the 3 MiB limit:\n\n\tfallocate rc=0\n\tfile size=4194304\n\nAfter this change, fallocate fails and leaves the file at 2 MiB.","state":0,"publishedAt":"2026-09-25T10:36:07.797+00:00","modifiedAt":"2026-10-21T12:54:37.445+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/smb/client/smb2ops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"72c419d9b073628d3b5b0b2fc787b724f1a8c726\",\n                            \"lessThan\": \"5fbd8848f2e25c8163896ec52863df2305a3bb63\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"72c419d9b073628d3b5b0b2fc787b724f1a8c726\",\n                            \"lessThan\": \"3673f057b64abfa957e8ae84448db69369a5091a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"72c419d9b073628d3b5b0b2fc787b724f1a8c726\",\n                            \"lessThan\": \"06a4f9049cb6dc319bceec2dc813ba89add8b828\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"72c419d9b073628d3b5b0b2fc787b724f1a8c726\",\n                            \"lessThan\": \"f320ca20c273a26cd779bdb2b2e4b076a95c76f6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"72c419d9b073628d3b5b0b2fc787b724f1a8c726\",\n                            \"lessThan\": \"88972e35750792e717af287dc71f42a03b5cbce4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/smb/client/smb2ops.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/5fbd8848f2e25c8163896ec52863df2305a3bb63","https://git.kernel.org/stable/c/3673f057b64abfa957e8ae84448db69369a5091a","https://git.kernel.org/stable/c/06a4f9049cb6dc319bceec2dc813ba89add8b828","https://git.kernel.org/stable/c/f320ca20c273a26cd779bdb2b2e4b076a95c76f6","https://git.kernel.org/stable/c/88972e35750792e717af287dc71f42a03b5cbce4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98126","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98126","identifiers":["CVE-2026-98126"]},"retained":false,"historicalAffected":[]}],"coverage":[]}