UBUNTU-CVE-2026-81014: Medium severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: fix heap OOB read in skstore() and kekstore() skstore() and kekstore() strip a trailing newline from the sysfs write before allocating the key buffer: length = count; if (buf[length - 1] == '\n') length--; bioscfgdrv.spmdata.signingkey = kmemdup(buf, length, GFPKERNEL); but then pass the original "count" (not "length") as the copy size to hpwmiperformquery(), which memcpy()s that many bytes out of the "length"-sized allocation, reading one byte past it whenever the write ends in a newline, the normal case for a shell "echo" into sysfs. KASAN confirms this directly: BUG: KASAN: slab-out-of-bounds in hpwmiperformquery+0x1e9/0x460 [hpbioscfg] Read of size 28 at addr ffff88813c8e2b80 by task python3/16022 ... skstore+0xa7/0x240 [hpbioscfg] kernfsfopwriteiter+0x3e1/0x5d0 ... The buggy address is located 0 bytes inside of allocated 27-byte region [ffff88813c8e2b80, ffff88813c8e2b9b) Reproduced identically for kekstore, and at multiple write sizes (28, 57, 201 bytes), each time reading exactly one byte past a kmemdup() allocation one byte smaller than the write. Fix by passing "length" instead of "count" to hpwmiperformquery() in both functions.