CVE-2026-89743
CVE CVE-2026-89743EUVD EUVD-2026-76655Published 2026-09-11T19:46:49.000ZLast changed 2026-09-13T06:33:52.000ZCVSS 7.7
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: misc: nsm: bound the device-reported response length nsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported by the NSM device into msg->resp.len without bounding it to the response buffer. A malicious or buggy backend can report a length larger than the response buffer; parse_resp_raw() then copies that many bytes out of the fixed buffer to user space, disclosing adjacent kernel heap (an out-of-bounds read). The request path already floors its length in fill_req_raw(); the response path lacks the symmetric check. Clamp the stored length to the size of the response buffer. Well-behaved devices report no more than the posted buffer size, so conforming traffic is unaffected.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.18.50; patch: 0; 6.8; patch: 7.3-rc1; b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <29e634a18957acda11383a15ab98a91c4ae9e294; b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <339f19b9a6171289b0e797deb8bda80b9a1fcc30; b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <808e530654a5354e6df78863a5d61e4d44e67235; patch: 6.12.109; b9873755a6c8ccfce79094c4dce9efa3ecb1a749 <2aa0fb9c96f894a9c179a48e7522ea6705800adf; patch: 7.2.4
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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