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Vulnerability · Published May 24, 2024 · Assigned by Linux

CVE-2021-47509ALSA: pcm: oss: Limit the period size to 16MB

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: Limit the period size to 16MB Set the practical limit to the period size (the fragment shift in OSS) instead of a full 31bit; a too large value could lead to the exhaust of memory as we allocate temporary buffers of the period size, too. As of this patch, we set to 16MB limit, which should cover all use cases.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.15.15-1DEBIAN-CVE-2021-47509
Debian:13linux5.15.15-1DEBIAN-CVE-2021-47509
Debian:14linux5.15.15-1DEBIAN-CVE-2021-47509
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47509
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47509
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47509

Affected products (as reported)

VendorProductVersions
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before d1bb703ad050de9095f10b2d3416c32921ac6bcc1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before b02a41eebcc36d4f07196780f2e165ca2c4992571da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before be55f306396cd62c6889286a7194fd8b53363aeb1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 2e54cf6794bf82a54aaefc78da13819aea9cd28a1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 76f19e4cbb548e28547f8c328aa0bfb3a10222d31da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before ad45babf7886e7a212ee1d5eda9ef49f696db43c1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 35a3e511032146941085f87dd9fb5b82ea5c00a21da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 8839c8c0f77ab8fc0463f4ab8b37fca3f70677c2
Linux Linux 2.6.12

References