Description
A heap-based buffer overflow flaw was found in the way the legacy_parse_param function in the Filesystem Context functionality of the Linux kernel verified the supplied parameters length. An unprivileged (in case of unprivileged user namespaces enabled, otherwise needs namespaced CAP_SYS_ADMIN privilege) local user able to open a filesystem that does not support the Filesystem Context API (and thus fallbacks to legacy handling) could use this flaw to escalate their privileges on the system.
Details
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| linux | — | 5.4.0-96.109 |
| linux-aws | — | 5.4.0-1063.66 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | 5.11.0-1027.30~20.04.1 |
| linux-aws-5.13 | — | 5.13.0-1011.12~20.04.1 |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1063.66~18.04.1 |
| linux-aws-5.8 | — | — |
| linux-aws-fips | — | — |
| linux-azure | — | 5.4.0-1067.70 |
| linux-azure-5.11 | — | 5.11.0-1027.30~20.04.1 |
| linux-azure-5.13 | — | 5.13.0-1012.14~20.04.1 |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1067.70~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-edge | — | — |
| linux-azure-fips | — | — |
| linux-bluefield | — | — |
| linux-fips | — | — |
| linux-gcp | — | 5.4.0-1062.66 |
| linux-gcp-5.11 | — | 5.11.0-1028.32~20.04.1 |
| linux-gcp-5.13 | — | 5.13.0-1012.15~20.04.1 |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1062.66~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-fips | — | — |
| linux-gke | — | 5.4.0-1059.62 |
| linux-gke-4.15 | — | — |
| linux-gke-5.4 | — | 5.4.0-1059.62~18.04.1 |
| linux-gkeop | — | 5.4.0-1031.32 |
| linux-gkeop-5.4 | — | 5.4.0-1031.32~18.04.1 |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | 5.13.0-27.29~20.04.1 |
| linux-hwe-5.4 | — | 5.4.0-96.109~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-edge | — | — |
| linux-ibm | — | 5.4.0-1012.13 |
| linux-ibm-5.4 | — | 5.4.0-1012.13~18.04.1 |
| linux-intel-5.13 | — | 5.13.0-1010.10 |
| linux-intel-iot-realtime | — | — |
| linux-kvm | — | 5.4.0-1053.55 |
| linux-oem | — | — |
| linux-oem-5.10 | — | 5.10.0-1057.61 |
| linux-oem-5.13 | — | 5.13.0-1028.35 |
| linux-oem-5.14 | — | 5.14.0-1020.22 |
| linux-oem-5.6 | — | — |
| linux-oracle | — | 5.4.0-1061.65 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | 5.11.0-1027.30~20.04.1 |
| linux-oracle-5.13 | — | 5.13.0-1015.19~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1061.65~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-raspi | — | 5.4.0-1050.56 |
| linux-raspi-5.4 | — | 5.4.0-1050.56~18.04.1 |
| linux-raspi-realtime | — | — |
| linux-raspi2 | — | — |
| linux-realtime | — | — |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | 5.11.0-1028.31~20.04.1 |
| linux-riscv-5.8 | — | — |
References
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