CVE-2026-64512ACPI: CPPC: Suppress UBSAN warning caused by field misuse
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Awaiting Analysis.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 4949affd5288b867cdf115f5b08d6166b2027f87 – < b54c4632946ae42f2b39ed38abd909bbf78cbcc2
- affected 01fc53be672acae37e611c80cc0b4f3939584de3 – < e904596ba6dd108534ffa15e3e46b2fe245145e2
- affected 1b890ae474d19800a6be1696df7fb4d9a41676e4 – < 2fb80e962029000959f651665baa4838cc92eb99
- affected 2f4a4d63a193be6fd530d180bb13c3592052904c – < 37f28bf8f14672dfa395994e41fd778a63f0bf5c
- affected 2f4a4d63a193be6fd530d180bb13c3592052904c – < f29dc6132d4968e39d8fa575d1a12e2c718ce57b
- affected 2f4a4d63a193be6fd530d180bb13c3592052904c – < dc066bd13c860bb27d6ace511210e18b8064c1d9
- affected 2f4a4d63a193be6fd530d180bb13c3592052904c – < 1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1
- affected 6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1
- affected 5.15.154 – < 5.15.155
- affected 6.1.90 – < 6.1.178
- affected 6.6.30 – < 6.6.145
- affected 6.8.9 – < 6.9
- affected 6.9
- unaffected < 6.9
- unaffected 5.15.155 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References7
- https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2 (opens in a new tab)
- https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2 (opens in a new tab)
- https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99 (opens in a new tab)
- https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c (opens in a new tab)
- https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b (opens in a new tab)
- https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9 (opens in a new tab)
- https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48856 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-64512)Record last updated .