They patched CVE-2026-43499 even for out of support kernels[1] so that's something. The bigger problem is CVEs in proprietary components (drivers, blobs, firmware).
[1] eg. https://review.lineageos.org/q/b309b56b8cca20dcf6f678777d3ac...
That's honestly impressive, enough security for a locked down backup phone.
That's very misleading since the vast majority of serious Linux kernel vulnerabilities aren't patched for these end-of-life devices. That vulnerability patched due to media coverage based on their policy to do so. It's no more severe than many of the unpatched ones.