CVE-2026-90226 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-LINUX612-20507245
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90226 (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: llcp: avoid userspace overflow on invalid optlen
nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so the kernel always stores 4 bytes regardless of the caller-supplied optlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length reported back to userspace; it does not constrain the store. A call with optlen < 4 therefore writes past the user buffer, violating the getsockopt(2) contract for all five supported optnames.
Reject any call with optlen < sizeof(u32) up front. 'len' is int, so a plain size comparison would promote a negative optlen to size_t and slip past the check; an explicit 'len < 0' test is added first to catch negative values before the size compare.
References
- https://security-tracker.debian.org/tracker/CVE-2026-90226
- https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526
- https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066
- https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd
- https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547
- https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67
- https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661
- https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3
- https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493