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Vulnerability · Published May 24, 2024 · Assigned by Linux

CVE-2021-47511ALSA: pcm: oss: Fix negative period/buffer sizes

Medium 5.5

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 84.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix negative period/buffer sizes The period size calculation in OSS layer may receive a negative value as an error, but the code there assumes only the positive values and handle them with size_t. Due to that, a too big value may be passed to the lower layers. This patch changes the code to handle with ssize_t and adds the proper error checks appropriately.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.15.15-1DEBIAN-CVE-2021-47511
Debian:13linux5.15.15-1DEBIAN-CVE-2021-47511
Debian:14linux5.15.15-1DEBIAN-CVE-2021-47511
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47511
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47511
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47511

Affected products (as reported)

VendorProductVersions
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before be8869d388593e57223ad39297c8e54be632f2f21da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 502e1146873d870f87da3b8f93d6bf2de5f38d0c1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 8af815ab052eaf74addbbfb556d63ce2137c0e1b1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before f96c0959c1ee92adc911c10d6ec209af501050491da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before f12c8a7515f641885677960af450082569a872431da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 02b2b691b77cd7b951fa7b6c9d44d4e472cdc8231da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 00a860678098fcd9fa8db2b5fb9d2ddf4776d4cc1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 9d2479c960875ca1239bcb899f386970c13d9cfe
Linux Linux 2.6.12

References