{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47353","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T14:28:16.986Z","datePublished":"2024-05-21T14:35:57.122Z","dateUpdated":"2025-12-18T11:37:07.292Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-18T11:37:07.292Z"},"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 epos.bh."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/udf/namei.c"],"versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"2f3d9ddd32a28803baa547e6274983b67d5e287c","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"371566f63cbd0bb6fbb25b8fe9d5798268d35af9","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"baea588a42d675e35daeaddd10fbc9700550bc4d","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"3638705ecd5ad2785e996f820121c0ad15ce64b5","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"80d505aee6398cf8beb72475c7edcf1733c1c68b","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"21bf1414580c36ffc8d8de043beb3508cf812238","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"aebed6b19e51a34003d998da5ebb1dfdd2cb1d02","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"5150877e4d99f85057a458daac7cd7c01005d5c6","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/udf/namei.c"],"versions":[{"version":"2.6.12","status":"affected"},{"version":"0","lessThan":"2.6.12","status":"unaffected","versionType":"semver"},{"version":"4.4.276","lessThanOrEqual":"4.4.*","status":"unaffected","versionType":"semver"},{"version":"4.9.276","lessThanOrEqual":"4.9.*","status":"unaffected","versionType":"semver"},{"version":"4.14.240","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.198","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.133","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.51","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.18","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.3","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"4.4.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"4.9.276"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"4.14.240"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"4.19.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.4.133"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.12.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.13.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c"},{"url":"https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9"},{"url":"https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4d"},{"url":"https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5"},{"url":"https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68b"},{"url":"https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238"},{"url":"https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02"},{"url":"https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6"},{"url":"https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43"}],"title":"udf: 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