CVE-2026-74719net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% 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: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler() The SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in smc_llc_event_handler() stores an incoming qentry into the local LLC flow without first checking whether a qentry is already pending. If a malicious or buggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is active and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the pointer without freeing the previous allocation, leaking one kmalloc-96 object per spurious message. The sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry guard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a duplicate message when qentry is already occupied falls through to break and is freed by the kfree(qentry) at the out: label, rather than silently leaking the existing allocation. The response direction (smc_llc_rx_response()) is unaffected: it already guards with flow->qentry at the equivalent site and drops duplicate responses correctly.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
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)
- 0.18% · top 93% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < e384f3cba6ea709f5b2272b1770db4ce14047f78
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < a1e980d7a9e7ee6faf4f5fd7b450413b969af26d
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < e0eb87677c76b157cdf8eb7c1f19e56227165a33
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < 06734dfeaeba886aab1bf147249195b888ac3e4d
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < c23c409228629107203d3c3e95fff1473173f1a6
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < 10cb31b2b74cb664c6c95cf72364d7d5c483ab82
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < bfc336a9fbbf09805f3dfe25c195a4db90af2846
- affected 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44 – < 976245094925bab9bc39366b2e9ab44ffcde61d0
- affected 5.8
- unaffected < 5.8
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.152 – ≤ 6.6.*
- unaffected 6.12.104 – ≤ 6.12.*
- unaffected 6.18.45 – ≤ 6.18.*
- unaffected 7.1.9 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78 (opens in a new tab)
- https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d (opens in a new tab)
- https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33 (opens in a new tab)
- https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d (opens in a new tab)
- https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6 (opens in a new tab)
- https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82 (opens in a new tab)
- https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846 (opens in a new tab)
- https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0 (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-2026-64406 (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)
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[](https://cveledger.app/cve/CVE-2026-74719)Record last updated .