--- id: CVE-2021-43975 title: >- In the Linux kernel through 5.15.2, hw_atl_utils_fw_rpc_wait in drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c allows an attacker (who can introduce a crafted device) to trigger an out-of-bounds write via a crafted length v… summary: >- In the Linux kernel through 5.15.2, hw_atl_utils_fw_rpc_wait in drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c allows an attacker (who can introduce a crafted device) to trigger an out-of-bounds write via a crafted length v… severity: medium cvss: 6.7 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-787 vendor: netapp product: cloud_backup affected: - linux_kernel <= 5.15.2 - fedora = 34 - fedora = 35 - debian_linux = 9.0 - debian_linux = 10.0 - cloud_backup - h500s_firmware - h700s_firmware - h300e_firmware - h500e_firmware - h700e_firmware - h410s_firmware - h410c_firmware published: '2021-11-17' updated: '2026-10-08' sourceUpdated: '2026-10-08T22:17:13.743' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-43975' references: - url: >- https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=b922f622592af76b57cbc566eaeccda0b31a3496 label: cve@mitre.org - url: 'https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html' label: cve@mitre.org - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X24M7KDC4OJOZNS3RDSYC7ELNELOLQ2N/ label: cve@mitre.org - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YODMYMGZYDXQKGJGX7TJG4XV4L5YLLBD/ label: cve@mitre.org - url: >- https://lore.kernel.org/netdev/163698540868.13805.17800408021782408762.git-patchwork-notify%40kernel.org/T/ label: cve@mitre.org - url: 'https://security.netapp.com/advisory/ntap-20211210-0001/' label: cve@mitre.org - url: 'https://www.debian.org/security/2022/dsa-5096' label: cve@mitre.org - url: >- https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=b922f622592af76b57cbc566eaeccda0b31a3496 label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X24M7KDC4OJOZNS3RDSYC7ELNELOLQ2N/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YODMYMGZYDXQKGJGX7TJG4XV4L5YLLBD/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lore.kernel.org/netdev/163698540868.13805.17800408021782408762.git-patchwork-notify%40kernel.org/T/ label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://security.netapp.com/advisory/ntap-20211210-0001/' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.debian.org/security/2022/dsa-5096' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-43975.json - url: 'https://access.redhat.com/security/cve/CVE-2021-43975' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2024989' - url: 'https://www.cve.org/CVERecord?id=CVE-2021-43975' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-43975' - url: 'https://access.redhat.com/errata/RHSA-2024:1188' - url: 'https://access.redhat.com/errata/RHSA-2024:1404' - url: 'https://access.redhat.com/errata/RHSA-2023:7077' - url: 'https://access.redhat.com/errata/RHSA-2023:6901' tags: - nvd - csaf - vex - red-hat - cve.org epss: 0.00551 epssPercentile: 0.45916 ingestedAt: '2026-10-08T23:16:47.325Z' patched: - virtualization_4_hypervisor_for_rhel 8 - enterprise_linux_baseos_eus_v_8_6 - enterprise_linux_baseos_eus_v_8_8 - enterprise_linux_baseos_v_8 - codeready_linux_builder_eus_v_8_6 - codeready_linux_builder_eus_v_8_8 - codeready_linux_builder_v_8 - enterprise_linux_real_time_for_nfv_v_8 - enterprise_linux_real_time_v_8 ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-10-08T21:11:16.924560Z' --- ## Overview In the Linux kernel through 5.15.2, hw_atl_utils_fw_rpc_wait in drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c allows an attacker (who can introduce a crafted device) to trigger an out-of-bounds write via a crafted length value. ## Affected - `linux_kernel <= 5.15.2` - `fedora = 34` - `fedora = 35` - `debian_linux = 9.0` - `debian_linux = 10.0` - `cloud_backup` - `h500s_firmware` - `h700s_firmware` - `h300e_firmware` - `h500e_firmware` - `h700e_firmware` - `h410s_firmware` - `h410c_firmware` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2024:1188** · Red Hat · fixed in: Red Hat Virtualization 4 Hypervisor for RHEL 8, Red Hat Enterprise Linux BaseOS EUS (v.8.6), Red Hat CodeReady Linux Builder EUS (v.8.6) · released 2024-03-06 · [advisory](https://access.redhat.com/errata/RHSA-2024:1188) - **RHSA-2024:1404** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS EUS (v.8.8), Red Hat CodeReady Linux Builder EUS (v.8.8) · released 2024-03-19 · [advisory](https://access.redhat.com/errata/RHSA-2024:1404) - **RHSA-2023:7077** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat CodeReady Linux Builder (v. 8) · released 2023-11-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:7077) - **RHSA-2023:6901** · Red Hat · fixed in: Red Hat Enterprise Linux Real Time for NFV (v. 8), Red Hat Enterprise Linux Real Time (v. 8) · released 2023-11-14 · [advisory](https://access.redhat.com/errata/RHSA-2023:6901) - **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-43975.json)