CVE-2026-90108net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% 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/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition When smc_llc_event_handler() transitions the local LLC flow from SMC_LLC_FLOW_REQ_ADD_LINK to SMC_LLC_FLOW_ADD_LINK on arrival of an ADD_LINK request, it calls smc_llc_flow_qentry_set() unconditionally: if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK) { lgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK; smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry); ... } A CONFIRM_LINK or ADD_LINK_CONT arriving while flow->type is SMC_LLC_FLOW_REQ_ADD_LINK is stashed into flow->qentry via the SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT handler (which stores into flow->qentry for any non-NONE flow type). When the subsequent ADD_LINK arrives, the REQ_ADD_LINK branch overwrites flow->qentry with the new pointer without first freeing the stashed allocation, leaking one kmalloc object. The stashed entry has no consumer: smc_llc_wait() is only called from llc_add_link_work, which is not yet scheduled while the flow type remains REQ_ADD_LINK. No waiter is sleeping on llc_msg_waiter at this point. It is safe to unconditionally free any stashed qentry before the overwrite. Call smc_llc_flow_qentry_del() before smc_llc_flow_qentry_set() in the REQ_ADD_LINK branch. smc_llc_flow_qentry_del() already checks flow->qentry before freeing, so the normal path where no entry is stashed is a no-op.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 32 days later
· 32 days 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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 – < 7dd55348c0d9399a9448847819e9f3904ae507ad
- affected b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 – < 056395acb7041b3a1f2baa08d89a1938a8b8776a
- affected b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 – < b08aacfb226a840628151643b6a34eecf545d311
- affected b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 – < 0fb9a513766071ea9d5f3bf988e39241b8e9ee3b
- affected b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 – < e25a602c45c76a7130878db72bcf6f76df04bf85
- affected b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196 – < 036322025d6e440cb75fc6fecbba9a16b271a2ae
- affected 5.16
- unaffected < 5.16
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/7dd55348c0d9399a9448847819e9f3904ae507ad (opens in a new tab)
- https://git.kernel.org/stable/c/056395acb7041b3a1f2baa08d89a1938a8b8776a (opens in a new tab)
- https://git.kernel.org/stable/c/b08aacfb226a840628151643b6a34eecf545d311 (opens in a new tab)
- https://git.kernel.org/stable/c/0fb9a513766071ea9d5f3bf988e39241b8e9ee3b (opens in a new tab)
- https://git.kernel.org/stable/c/e25a602c45c76a7130878db72bcf6f76df04bf85 (opens in a new tab)
- https://git.kernel.org/stable/c/036322025d6e440cb75fc6fecbba9a16b271a2ae (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-2026-81701 (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-2026-90108)Record last updated .