CVE-2026-90221 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506722
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90221 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
nfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing
nci_core_init_rsp_packet_v1() and nci_core_init_rsp_packet_v2() parse the CORE_INIT_RSP packet without validating that the skb contains enough data. A malformed response (e.g. injected via virtual_ncidev) can declare a large num_supported_rf_interfaces while providing insufficient data, causing reads of uninitialized slab memory. This is later used in nci_init_complete_req(), triggering a KMSAN uninit-value warning.
Add skb length checks before accessing packet fields:
- Validate the skb has at least 1 byte for the status field.
- Validate the skb can hold the fixed-size header before parsing.
- In v2, bounds-check each variable-length rf_interface entry and its extension parameters within the parsing loop.
- In v1, verify the skb is large enough for both the variable-length rf_interfaces array and the trailing rsp_2 structure.
References
- https://security-tracker.debian.org/tracker/CVE-2026-90221
- https://git.kernel.org/stable/c/2f434478771a4ebdd535033561c0590bcde39753
- https://git.kernel.org/stable/c/4f0483bbcdaccc9d4aee30df7351863334cecfa7
- https://git.kernel.org/stable/c/5487f04c1ccbfa15aa6e531eb1ec9c9ec9c7bf31
- https://git.kernel.org/stable/c/7d44b897bff84edcd4814899314d661ad4956a8e
- https://git.kernel.org/stable/c/baed3fdf6ed2195c56f25ae18a086b938dcd3983
- https://git.kernel.org/stable/c/bbe68e8249e2c76d65adfd9224fa95f1ca0fbe4e
- https://git.kernel.org/stable/c/d56575a2595ee1f597f39e8a1cfb67ed3501678d