net: stmmac: fix oops when split header is enabled

Summary

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.

Timeline

1. May 27, 2026, 12:17 PM UTCCVE published
2. Oct 21, 2026, 12:41 PM UTCRecord last updated

Affected versions

• Linux Linux

  From ec222003bd948de8f3ffbca522d328af1a8452ad · fixed in 107e169f963920b11fa3c1bb384c077fe7330696; From ec222003bd948de8f3ffbca522d328af1a8452ad · fixed in 92b45c99311ac4f3857cccee47059c4fb067fd4d; From ec222003bd948de8f3ffbca522d328af1a8452ad · fixed in b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609; From ec222003bd948de8f3ffbca522d328af1a8452ad · fixed in 36f81cb7d82e9614a7058da6abdf2e3a03993df1; From ec222003bd948de8f3ffbca522d328af1a8452ad · fixed in babab1b42ed68877ef669a08384becf281ad2582

• Linux Linux

  5.4

• KernelLinux

  From 5.4.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.114; From 6.13.0 · fixed in 6.18.14; From 6.19.0 · fixed in 6.19.4

References 5