{"id":"CVE-2021-47353","state":"PUBLISHED","title":"udf: Fix NULL pointer dereference in udf_symlink function","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nudf: Fix NULL pointer dereference in udf_symlink function\n\nIn function udf_symlink, epos.bh is assigned with the value returned\nby udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c\nand returns the value of sb_getblk function that could be NULL.\nThen, epos.bh is used without any check, causing a possible\nNULL pointer dereference when sb_getblk fails.\n\nThis fix adds a check to validate the value of epos.bh.","publishedAt":"2024-05-21T14:35:57.122Z","updatedAt":"2026-05-11T13:53:03.838Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"2f3d9ddd32a28803baa547e6274983b67d5e287c","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"371566f63cbd0bb6fbb25b8fe9d5798268d35af9","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"baea588a42d675e35daeaddd10fbc9700550bc4d","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"3638705ecd5ad2785e996f820121c0ad15ce64b5","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"80d505aee6398cf8beb72475c7edcf1733c1c68b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"21bf1414580c36ffc8d8de043beb3508cf812238","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"aebed6b19e51a34003d998da5ebb1dfdd2cb1d02","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5150877e4d99f85057a458daac7cd7c01005d5c6","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/udf/namei.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"4.4.276","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.276","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.240","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.198","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.133","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.51","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.18","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13.3","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/udf/namei.c"]}],"references":["https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c","https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9","https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4d","https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5","https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68b","https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238","https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02","https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6","https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47353.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47353","state":"PUBLISHED","datePublished":"2024-05-21T14:35:57.122Z","dateUpdated":"2026-05-11T13:53:03.838Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:28:16.986Z"},"containers":{"cna":{"title":"udf: Fix NULL pointer dereference in udf_symlink function","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nudf: Fix NULL pointer dereference in udf_symlink function\n\nIn function udf_symlink, epos.bh is assigned with the value returned\nby udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c\nand returns the value of sb_getblk function that could be NULL.\nThen, epos.bh is used without any check, causing a possible\nNULL pointer dereference when sb_getblk fails.\n\nThis fix adds a check to validate the value of 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