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CVE-2021-3492 PUBLISHED

Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.

EPSS 20.84% · 95.6th percentile

Risk Scores

EPSS Score
20.84%
95.6th percentile

Affected Products

VendorProductVersions
Ubuntu:18.04:LTSlinux-hwe5.3.0-69.65, 5.3.0-72.68, 5.0.0-36.39~18.04.1
Ubuntu:18.04:LTSlinux-azure-5.35.3.0-1009.10~18.04.1, 5.3.0-1010.11~18.04.1, 5.3.0-1012.13~18.04.1
Ubuntu:18.04:LTSlinux-gke-5.35.3.0-1016.17~18.04.1, 0, 5.3.0-1011.12~18.04.1
Ubuntu:Pro:FIPS-updates:20.04:LTSlinux-aws-fips5.4.0-1021.21+fips2, 0
Ubuntu:18.04:LTSlinux-gke-5.45.4.0-1039.41~18.04.1, 5.4.0-1037.39~18.04.1, 5.4.0-1036.38~18.04.1
Ubuntu:22.04:LTSlinux-intel-iot-realtime0, 5.15.0-1073.75
Ubuntu:18.04:LTSlinux-azure-5.4*, *, *
Ubuntu:18.04:LTSlinux-gcp-edge*, 4.18.0-1013.14~18.04.1, 4.18.0-1015.16~18.04.1
Ubuntu:20.04:LTSlinux-gke5.4.0-1036.38, 5.4.0-1037.39, 5.4.0-1039.41
Ubuntu:20.04:LTSlinux5.4.0-9.12, 5.4.0-54.60, 5.4.0-64.72
Ubuntu:18.04:LTSlinux-oracle-5.45.4.0-1029.31~18.04.1, 5.4.0-1030.32~18.04.1, 5.4.0-1033.35
Ubuntu:20.04:LTSlinux-gkeop0, 5.4.0-1012.13, 5.4.0-1013.14
Ubuntu:18.04:LTSlinux-raspi-5.45.4.0-1021.24~18.04.1, 5.4.0-1023.26~18.04.1, 5.4.0-1025.28~18.04.1
Ubuntu:20.04:LTSlinux-oem-5.65.6.0-1032.33, 5.6.0-1013.13, 5.6.0-1028.28
Ubuntu:16.04:LTSlinux-hwe-edge4.8.0-28.30~16.04.1, 4.13.0-19.22~16.04.1, 4.13.0-21.24~16.04.1
Ubuntu:24.04:LTSlinux-raspi-realtime6.8.0-2019.20, 0
Ubuntu:Pro:FIPS:20.04:LTSlinux-gcp-fips5.4.0-1021.21+fips1, 0
Ubuntu:20.04:LTSlinux-riscv-5.80, 5.8.0-14.16~20.04.1, 5.8.0-14.16~20.04.3
Ubuntu:20.04:LTSlinux-hwe-5.80, 5.8.0-40.45~20.04.1, 5.8.0-41.46~20.04.1
Ubuntu:Pro:FIPS:20.04:LTSlinux-azure-fips0, 5.4.0-1022.22+fips1

…and 26 more

Timeline

References

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