CVE-2026-45940net: stmmac: fix oops when split header is enabled
- 5.5MediumCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 92% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Undergoing Analysis | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected ec222003bd948de8f3ffbca522d328af1a8452ad – < a7fe1d75e087862bc4087f3fcdfd5e291b9d9caa
- affected ec222003bd948de8f3ffbca522d328af1a8452ad – < 107e169f963920b11fa3c1bb384c077fe7330696
- affected ec222003bd948de8f3ffbca522d328af1a8452ad – < 92b45c99311ac4f3857cccee47059c4fb067fd4d
- affected ec222003bd948de8f3ffbca522d328af1a8452ad – < b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609
- affected ec222003bd948de8f3ffbca522d328af1a8452ad – < 36f81cb7d82e9614a7058da6abdf2e3a03993df1
- affected ec222003bd948de8f3ffbca522d328af1a8452ad – < babab1b42ed68877ef669a08384becf281ad2582
- affected 5.4
- unaffected < 5.4
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.114 – ≤ 6.12.*
- unaffected 6.18.14 – ≤ 6.18.*
- unaffected 6.19.4 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/a7fe1d75e087862bc4087f3fcdfd5e291b9d9caa (opens in a new tab)
- https://git.kernel.org/stable/c/107e169f963920b11fa3c1bb384c077fe7330696 (opens in a new tab)
- https://git.kernel.org/stable/c/92b45c99311ac4f3857cccee47059c4fb067fd4d (opens in a new tab)
- https://git.kernel.org/stable/c/b1f23df09e7dbf4c86b6908dff7efb8cb2b7d609 (opens in a new tab)
- https://git.kernel.org/stable/c/36f81cb7d82e9614a7058da6abdf2e3a03993df1 (opens in a new tab)
- https://git.kernel.org/stable/c/babab1b42ed68877ef669a08384becf281ad2582 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-32224 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-45940)Record last updated .