VulnerabilityPublished 27 May 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in babab1b42ed68877ef669a08384becf281ad2582 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in babab1b42ed68877ef669a08384becf281ad2582, b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609, 107e169f963920b11fa3c1bb384c077fe7330696 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ec222003bd948de8f3ffbca522d328af1a8452ad, < babab1b42ed68877ef669a08384becf281ad2582	Fixed in babab1b42ed68877ef669a08384becf281ad2582
LinuxLinux	Affected ≥ ec222003bd948de8f3ffbca522d328af1a8452ad, < b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609	Fixed in b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609
LinuxLinux	Affected ≥ ec222003bd948de8f3ffbca522d328af1a8452ad, < 107e169f963920b11fa3c1bb384c077fe7330696	Fixed in 107e169f963920b11fa3c1bb384c077fe7330696
LinuxLinux	Affected ≥ ec222003bd948de8f3ffbca522d328af1a8452ad, < 92b45c99311ac4f3857cccee47059c4fb067fd4d	Fixed in 92b45c99311ac4f3857cccee47059c4fb067fd4d
LinuxLinux	Affected ≥ ec222003bd948de8f3ffbca522d328af1a8452ad, < 36f81cb7d82e9614a7058da6abdf2e3a03993df1	Fixed in 36f81cb7d82e9614a7058da6abdf2e3a03993df1
LinuxLinux	Affected =5.4	Fixed in–

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.

References

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