CVE-2026-45940: Linux vulnerability

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

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.

UnknownCVSS not scoredNot KEV-listedUpdatedOct 21, 2026, 12:41 UTC (UTC+00:00)

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 27, 2026, 12:17 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

3Timeline events

0ADP providers

6Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
May 13, 2026, 15:03 UTC (UTC+00:00)
CVE publishedCVE Program
The CVE record was published.
May 27, 2026, 12:17 UTC (UTC+00:00)
CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Oct 21, 2026, 12:41 UTC (UTC+00:00)

Source materials

CVE List V5 sourceCVE List V5
https://git.kernel.org/stable/c/107e169f963920b11fa3c1bb384c077fe7330696CVE reference, Linux
https://git.kernel.org/stable/c/92b45c99311ac4f3857cccee47059c4fb067fd4dCVE reference, Linux
https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609CVE reference, Linux
https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1CVE reference, Linux
https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582CVE reference, Linux

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

LinuxLinuxec222003bd948de8f3ffbca522d328af1a8452ad, ec222003bd948de8f3ffbca522d328af1a8452ad, ec222003bd948de8f3ffbca522d328af1a8452ad, ec222003bd948de8f3ffbca522d328af1a8452ad, ec222003bd948de8f3ffbca522d328af1a8452adunaffected

LinuxLinux5.4, 0, 6.6.160, 6.12.114, 6.18.14, 6.19.4, 7.0affected

Weakness

CWE details

No CWE listed

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