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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2021-47388mac80211: fix use-after-free in CCMP/GCMP RX

High 8.8

In plain English

A high-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 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.3%top 72.2% 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: mac80211: fix use-after-free in CCMP/GCMP RX When PN checking is done in mac80211, for fragmentation we need to copy the PN to the RX struct so we can later use it to do a comparison, since commit bf30ca922a0c ("mac80211: check defrag PN against current frame"). Unfortunately, in that commit I used the 'hdr' variable without it being necessarily valid, so use-after-free could occur if it was necessary to reallocate (parts of) the frame. Fix this by reloading the variable after the code that results in the reallocations, if any. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux5.14.12-1DEBIAN-CVE-2021-47388
Debian:13linux5.14.12-1DEBIAN-CVE-2021-47388
Debian:14linux5.14.12-1DEBIAN-CVE-2021-47388
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2021-47388
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2021-47388
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2021-47388

Affected products (as reported)

VendorProductVersions
Linux Linux 608b0a2ae928a74a2f89e02227339dd79cdb63cf – before 447d001b875d0e7f211c4ba004916028da994258d0f613fe6de344dc17ba04a88921a2094c13d3fa – before 31de381aef0ab1b342f62485118dc8a19363dc78a9b57952fed41556c950a92123086724eaf11919 – before f556e1d6fb9f2923a9a36f3df638c7d79ba09dbb0f716b48ed25503e6961f4b5b40ece36f7e4ed26 – before 3d5d629c99c468458022e9b381789de3595bf4ddc8b3a6150dc8ac78d5fdd5fbdfc4806249ef8b2c – before 50149e0866a82cef33e680ee68dc380a5bc75d32e64ea0597050157f926ac2ba9b478a44ee5be945 – before 57de2dcb18742dc2860861c9f496da7d42b67da0bf30ca922a0c0176007e074b0acc77ed345e9990 – before 27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9bf30ca922a0c0176007e074b0acc77ed345e9990 – before 94513069eb549737bcfc3d988d6ed4da948a2de8
Linux Linux 5.13

References