CVE-2026-64512None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: ACPI: CPPC: Suppress UBSAN warning caused by field misuse The definition of reg->access_width changes depending on the reg->space_id type. Type ACPI_ADR_SPACE_PLATFOR…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
ACPI: CPPC: Suppress UBSAN warning caused by field misuse
The definition of reg->access_width changes depending on the reg->space_id type. Type ACPI_ADR_SPACE_PLATFORM_COMM uses access_width to indicate the PCC region, which can result in a UBSAN if the value is greater than 4.
For example:
UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9 shift exponent 32 is too large for 32-bit type 'int' CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy) Hardware name: To be filled by O.E.M. Call trace: ...(trimming) ubsan_epilogue+0x10/0x48 __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0 cpc_write+0x4d0/0x670 cppc_set_perf+0x18c/0x490 cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq] ... (trimming)
Lets fix this by validating the region type, as well as whether access_width has a value. Then since we are returning bit_width directly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting the size.
Linux >= 4949affd5288b867cdf115f5b08d6166b2027f87 < b54c4632946ae42f2b39ed38abd909bbf78cbcc2Linux >= 01fc53be672acae37e611c80cc0b4f3939584de3 < e904596ba6dd108534ffa15e3e46b2fe245145e2Linux >= 1b890ae474d19800a6be1696df7fb4d9a41676e4 < 2fb80e962029000959f651665baa4838cc92eb99Linux >= 2f4a4d63a193be6fd530d180bb13c3592052904c < 37f28bf8f14672dfa395994e41fd778a63f0bf5cLinux >= 2f4a4d63a193be6fd530d180bb13c3592052904c < f29dc6132d4968e39d8fa575d1a12e2c718ce57bLinux >= 2f4a4d63a193be6fd530d180bb13c3592052904c < dc066bd13c860bb27d6ace511210e18b8064c1d9Linux >= 2f4a4d63a193be6fd530d180bb13c3592052904c < 1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1Linux 6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1Linux >= 5.15.154 < 5.15.155Linux >= 6.1.90 < 6.1.178Linux >= 6.6.30 < 6.6.145Linux >= 6.8.9 < 6.9Linux 6.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-99284Nonenet: skbuff: propagate shared-frag marker in skb_zerocopy()
CVE-2026-99283Nonenetfilter: conntrack: tcp: use UNACK timeout for non-closing RST packets
CVE-2026-99272Nonesmb: client: validate the data area in SMB2_read()
CVE-2026-99271NoneALSA: line6: Clear prev_fbuf on capture buffer release
CVE-2026-99273Noneksmbd: reserve space for the UTF-16 terminator in stream info
CVE-2026-99275Nonesmb: client: reject short SESSION_SETUP responses