CVE-2026-45940

net: stmmac: fix oops when split header is enabled

State: Published
Severity: Not scored
Published: May 27, 2026
Updated: Oct 30, 2026
Reserved: May 13, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ec222003bd948de8f3ffbca522d328af1a8452ad to before a7fe1d75e087862bc4087f3fcdfd5e291b9d9caaAffected ec222003bd948de8f3ffbca522d328af1a8452ad to before 107e169f963920b11fa3c1bb384c077fe7330696Affected ec222003bd948de8f3ffbca522d328af1a8452ad to before 92b45c99311ac4f3857cccee47059c4fb067fd4dAffected ec222003bd948de8f3ffbca522d328af1a8452ad to before b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609Affected ec222003bd948de8f3ffbca522d328af1a8452ad to before 36f81cb7d82e9614a7058da6abdf2e3a03993df1Affected ec222003bd948de8f3ffbca522d328af1a8452ad to before babab1b42ed68877ef669a08384becf281ad2582Affected
LinuxLinux	5.4Affected before 5.4Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.114 through 6.12.Not affected 6.18.14 through 6.18.Not affected 6.19.4 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

ec222003bd948de8f3ffbca522d328af1a8452ad to before a7fe1d75e087862bc4087f3fcdfd5e291b9d9caaAffected
ec222003bd948de8f3ffbca522d328af1a8452ad to before 107e169f963920b11fa3c1bb384c077fe7330696Affected
ec222003bd948de8f3ffbca522d328af1a8452ad to before 92b45c99311ac4f3857cccee47059c4fb067fd4dAffected
ec222003bd948de8f3ffbca522d328af1a8452ad to before b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609Affected
ec222003bd948de8f3ffbca522d328af1a8452ad to before 36f81cb7d82e9614a7058da6abdf2e3a03993df1Affected
ec222003bd948de8f3ffbca522d328af1a8452ad to before babab1b42ed68877ef669a08384becf281ad2582Affected

LinuxLinux

5.4Affected
before 5.4Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.114 through 6.12.*Not affected
6.18.14 through 6.18.*Not affected
6.19.4 through 6.19.*Not affected
7.0 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.