{"id":"CVE-2021-47511","state":"PUBLISHED","title":"ALSA: pcm: oss: Fix negative period/buffer sizes","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: oss: Fix negative period/buffer sizes\n\nThe period size calculation in OSS layer may receive a negative value\nas an error, but the code there assumes only the positive values and\nhandle them with size_t.  Due to that, a too big value may be passed\nto the lower layers.\n\nThis patch changes the code to handle with ssize_t and adds the proper\nerror checks appropriately.","publishedAt":"2024-05-24T15:09:26.695Z","updatedAt":"2026-05-11T13:56:04.547Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"be8869d388593e57223ad39297c8e54be632f2f2","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"502e1146873d870f87da3b8f93d6bf2de5f38d0c","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"8af815ab052eaf74addbbfb556d63ce2137c0e1b","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f96c0959c1ee92adc911c10d6ec209af50105049","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"f12c8a7515f641885677960af450082569a87243","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"02b2b691b77cd7b951fa7b6c9d44d4e472cdc823","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"9d2479c960875ca1239bcb899f386970c13d9cfe","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/oss/pcm_oss.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":"4.4.295","status":"unaffected","lessThanOrEqual":"4.4.*","versionType":"semver"},{"version":"4.9.293","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.258","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.221","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.165","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.85","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.8","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/oss/pcm_oss.c"]}],"references":["https://git.kernel.org/stable/c/be8869d388593e57223ad39297c8e54be632f2f2","https://git.kernel.org/stable/c/502e1146873d870f87da3b8f93d6bf2de5f38d0c","https://git.kernel.org/stable/c/8af815ab052eaf74addbbfb556d63ce2137c0e1b","https://git.kernel.org/stable/c/f96c0959c1ee92adc911c10d6ec209af50105049","https://git.kernel.org/stable/c/f12c8a7515f641885677960af450082569a87243","https://git.kernel.org/stable/c/02b2b691b77cd7b951fa7b6c9d44d4e472cdc823","https://git.kernel.org/stable/c/00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc","https://git.kernel.org/stable/c/9d2479c960875ca1239bcb899f386970c13d9cfe"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47511.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47511","state":"PUBLISHED","datePublished":"2024-05-24T15:09:26.695Z","dateUpdated":"2026-05-11T13:56:04.547Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-24T15:02:54.823Z"},"containers":{"cna":{"title":"ALSA: pcm: oss: Fix negative period/buffer sizes","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: oss: Fix negative period/buffer sizes\n\nThe period size calculation in OSS layer may receive a negative value\nas an error, but the code there assumes only the positive values and\nhandle them with size_t.  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