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.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < e384f3cba6ea709f5b2272b1770db4ce14047f78; >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < a1e980d7a9e7ee6faf4f5fd7b450413b969af26d; >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < e0eb87677c76b157cdf8eb7c1f19e56227165a33; >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < 06734dfeaeba886aab1bf147249195b888ac3e4d; >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < c23c409228629107203d3c3e95fff1473173f1a6; >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < 10cb31b2b74cb664c6c95cf72364d7d5c483ab82; >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < bfc336a9fbbf09805f3dfe25c195a4db90af2846; >= 0fb0b02bd6fd26cba38002be4a6bbcae2228fd44, < 976245094925bab9bc39366b2e9ab44ffcde61d0 |
| Linux | Linux | 5.8 |
References
- https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d
- https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82
- https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0
- https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d
- https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846
- https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6
- https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33
- https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78
Timeline
- Published
- Aug 22, 2026
- Last modified
- Oct 14, 2026
- NVD status
- Received