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Vulnerability · Published Oct 23, 2026 · Assigned by Linux

CVE-2026-98951riscv: ptrace: Zero-initialize regset buffers before copyin

Unrated

In plain English

A 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 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 95.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: riscv: ptrace: Zero-initialize regset buffers before copyin user_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET request with a short iov_len leaves the rest of the stack buffer uninitialized. In riscv_vr_set() that garbage is validated and copied into the target's vstate, and in riscv_cfi_set() it can be stored as the target's shadow stack pointer. Zero both buffers, as the get path already does.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13linuxno fix listedDEBIAN-CVE-2026-98951
Debian:14linux7.2.11-1DEBIAN-CVE-2026-98951
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux7.3.0-10.10UBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-aws7.3.0-1004.4UBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-azureno fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-gcp7.3.0-1004.4UBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-oracle7.3.0-1004.4UBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-raspi7.3.0-1004.4UBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-realtime7.3.0-10.10.1UBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98951
Ubuntu:26.10linux-riscv7.3.0-10.10.1UBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98951
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98951
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98951

Affected products (as reported)

VendorProductVersions
Linux Linux 9300f00439743c4a34d735e1a27118eb68a1504e – before 89fc70d73f4ac8781f9e15edd1dbc6b6088453b39300f00439743c4a34d735e1a27118eb68a1504e – before 59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97f2a9cd050901c4734bc175294c3bd6a40a1a9e996.5.3 – before 6.6
Linux Linux 6.6

References