Log in Start free

Vulnerability · Published May 27, 2026 · Assigned by Linux

CVE-2026-45940net: stmmac: fix oops when split header is enabled

Medium 5.5

In plain English

A medium-severity 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 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 92.1% 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: net: stmmac: fix oops when split header is enabled For GMAC4, when split header is enabled, in some rare cases, the hardware does not fill buf2 of the first descriptor with payload. Thus we cannot assume buf2 is always fully filled if it is not the last descriptor. Otherwise, the length of buf2 of the second descriptor will be calculated wrong and cause an oops: Unable to handle kernel paging request at virtual address ffff00019246bfc0 ... x2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000 Call trace: dcache_inval_poc+0x28/0x58 (P) dma_direct_sync_single_for_cpu+0x38/0x6c __dma_sync_single_for_cpu+0x34/0x6c stmmac_napi_poll_rx+0x8f0/0xb60 __napi_poll.constprop.0+0x30/0x144 net_rx_action+0x160/0x274 handle_softirqs+0x1b8/0x1fc ... To fix this, the PL bit-field in RDES3 register is used for all descriptors, whether it is the last descriptor or not.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-45940
Debian:13linux6.12.115-2DEBIAN-CVE-2026-45940
Debian:14linux6.18.14-1DEBIAN-CVE-2026-45940
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-45940
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-45940
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-45940
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-45940

Affected products (as reported)

VendorProductVersions
Linux Linux ec222003bd948de8f3ffbca522d328af1a8452ad – before a7fe1d75e087862bc4087f3fcdfd5e291b9d9caaec222003bd948de8f3ffbca522d328af1a8452ad – before 107e169f963920b11fa3c1bb384c077fe7330696ec222003bd948de8f3ffbca522d328af1a8452ad – before 92b45c99311ac4f3857cccee47059c4fb067fd4dec222003bd948de8f3ffbca522d328af1a8452ad – before b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609ec222003bd948de8f3ffbca522d328af1a8452ad – before 36f81cb7d82e9614a7058da6abdf2e3a03993df1ec222003bd948de8f3ffbca522d328af1a8452ad – before babab1b42ed68877ef669a08384becf281ad2582
Linux Linux 5.4

References