CVE-2021-22555

bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: r...

CVE-2021-22555 is fixed in 41 products on 1 platform, first by RHSA-2021:3057, released August 10, 2021. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on October 6, 2025. Patch Radar priority: Patch now.

Patch nowCISA KEV
CVSS
7.8
Important
Exploitation
Exploited
Listed by CISA
CISA KEV
Oct 6, 2025
Federal due date Oct 27, 2025
EPSS
0.7868
99th percentile

The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609) * kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543) * kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * Urgent: Missing dptf_power.ko module in RHEL8 (BZ#1968381) * [mlx5] kdump over NFS fails: mlx5 driver gives error "Stop room 95 is bigger than the SQ size 64" (BZ#1969909) * BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 in bluetooth hci_error_reset on intel-tigerlake-h01 (BZ#1972564) * Update CIFS to kernel 5.10 (BZ#1973637) * Backport "tick/nohz: Conditionally restart tick on idle exit" to RHEL 8.5 (BZ#1978710) * Significant performance drop starting on kernel-4.18.0-277 visible on mmap benchmark (BZ#1980314) * Inaccessible NFS server overloads clients (native_queued_spin_lock_slowpath connotation?) (BZ#1980613) * [RHEL8.4 BUG],RialtoMLK, I915 graphic driver failed to boot with one new 120HZ panel (BZ#1981250) * act_ct: subject to DNAT tuple collision (BZ#1982494) Enhancement(s): * [Lenovo 8.5 FEAT] drivers/nvme - Update to the latest upstream (BZ#1965415)

Where it's fixed

ProductFixed inFixReleased
Linux
bpftool · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
bpftool · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-abi-stablelists · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-abi-stablelists · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-core · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-core · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-cross-headers · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-debug · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-debug · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-debug-core · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-debug-core · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-debug-devel · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-debug-devel · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-debug-modules · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-debug-modules · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-debug-modules-extra · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-debug-modules-extra · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-devel · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-devel · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-doc · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-doc · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-headers · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-modules · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-modules · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-modules-extra · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-modules-extra · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-rt · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-core · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-debug · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-debug-core · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-debug-devel · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-debug-kvm · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-debug-modules · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-debug-modules-extra · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-devel · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-kvm · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-modules · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-rt-modules-extra · RHEL 8 0:4.18.0-305.12.1.rt7.84.el8_4 RHSA-2021:3088 Aug 10, 2021
kernel-tools · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-tools · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-tools-libs · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-tools-libs · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-tools-libs-devel · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-tools-libs-devel · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
kernel-zfcpdump · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-zfcpdump-core · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-zfcpdump-devel · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-zfcpdump-modules · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kernel-zfcpdump-modules-extra · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
kpatch-patch-4_18_0-305 · RHEL 8 0:1-4.el8 RHSA-2021:3044 Aug 10, 2021
kpatch-patch-4_18_0-305_10_2 · RHEL 8 0:1-1.el8_4 RHSA-2021:3044 Aug 10, 2021
kpatch-patch-4_18_0-305_3_1 · RHEL 8 0:1-3.el8_4 RHSA-2021:3044 Aug 10, 2021
kpatch-patch-4_18_0-305_7_1 · RHEL 8 0:1-2.el8_4 RHSA-2021:3044 Aug 10, 2021
perf · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
perf · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021
python3-perf · RHEL 8 0:4.18.0-305.12.1.el8_4 RHSA-2021:3057 Aug 10, 2021
python3-perf · ol 8 0:4.18.0-305.12.1.el8_4 ELSA-2021-3057 Aug 11, 2021

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