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CVE-2026-64229— x86/mm: Disable broadcast TLB flush when PCID is disabled

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40< fed725cace3ab1c4f7f8182e35029a603d953187affected
4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40< d2d6d21286719b454d5d87a8758c23d2377d88a2affected
4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40< 44126343d58c68adaa8343fbf1c07dd20078c35eaffected
6.15affected
< 6.15unaffected
6.18.35≤ 6.18.*unaffected
7.0.11≤ 7.0.*unaffected
7.1≤ *unaffected
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I. Basic Information for CVE-2026-64229

Vulnerability Information
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Vulnerability Title
x86/mm: Disable broadcast TLB flush when PCID is disabled
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Disable broadcast TLB flush when PCID is disabled Booting with "nopcid" clears X86_FEATURE_PCID and keeps CR4.PCIDE from being set to one. On AMD CPUs that support INVLPGB, broadcast TLB flushing remains enabled. There are two checks that decide whether the global ASID code runs, mm_global_asid() and consider_global_asid(), that key off of the X86_FEATURE_INVLPGB feature. Once an mm becomes active on more than three CPUs, consider_global_asid() assigns it a global ASID, after which flush_tlb_mm_range() takes the broadcast_tlb_flush() path using a non-zero PCID. Issuing an INVLPGB with a non-zero PCID while CR4.PCIDE is not set results in a #GP: Oops: general protection fault, kernel NULL pointer dereference 0x1: 0000 [#1] SMP NOPTI CPU: 158 UID: 0 PID: 3119 Comm: snap Not tainted 7.1.0-rc3 #1 PREEMPT(full) Hardware name: ... RIP: 0010:broadcast_tlb_flush Code: ... 89 da 48 83 c8 07 <0f> 01 fe eb 08 cc cc cc ... Call Trace: <TASK> flush_tlb_mm_range ptep_clear_flush wp_page_copy ? _raw_spin_unlock __handle_mm_fault handle_mm_fault do_user_addr_fault exc_page_fault asm_exc_page_fault All processors that support broadcast TLB invalidation also have PCID support, so it is only the "nopcid" scenario that is of concern. In this situation just disable the broadcast TLB support using the CPUID dependency support by making X86_FEATURE_INVLPGB dependent on X86_FEATURE_PCID. [ bp: Massage commit message. ]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.15之前版本存在安全漏洞，该漏洞源于PCID禁用时广播TLB刷新未被禁用，可能导致空指针引用和系统崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40 ~ fed725cace3ab1c4f7f8182e35029a603d953187 -
LinuxLinux 6.15 -

II. Public POCs for CVE-2026-64229

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III. Intelligence Information for CVE-2026-64229

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Patches & Fixes for CVE-2026-64229 (2)

Same Patch Batch · Linux · 2026-07-24 · 48 CVEs total

CVE-2026-642329.8 CRITICALblock: recompute nr_integrity_segments in blk_insert_cloned_request
CVE-2026-642169.8 CRITICALnetfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()
CVE-2026-642558.8 HIGHwifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
CVE-2026-642478.4 HIGHKVM: x86: hyper-v: Bound the bank index when querying sparse banks
CVE-2026-642358.1 HIGHx86/ftrace: Relocate %rip-relative percpu refs in dynamic trampolines
CVE-2026-642238.1 HIGHwifi: mac80211: consume only present negotiated TTLM maps
CVE-2026-642267.8 HIGHsched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
CVE-2026-642217.8 HIGHspi: ti-qspi: fix use-after-free after DMA setup failure
CVE-2026-642187.8 HIGHbatman-adv: bla: fix report_work leak on backbone_gw purge
CVE-2026-642517.8 HIGHpwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()
CVE-2026-642177.8 HIGHnetfs: Fix overrun check in netfs_extract_user_iter()
CVE-2026-642087.5 HIGHcrypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
CVE-2026-642107.5 HIGHnet/mlx5e: xsk: Fix unlocked writing to ICOSQ
CVE-2026-642437.1 HIGHASoC: codecs: simple-mux: Fix enum control bounds check
CVE-2026-642227.0 HIGHocteontx2-pf: avoid double free of pool->stack on AQ init failure
CVE-2026-642197.0 HIGHdrm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_as
CVE-2026-64250LoongArch: Report dying CPU to RCU in stop_this_cpu()
CVE-2026-64252MIPS: DEC: Prevent initial console buffer from landing in XKPHYS
CVE-2026-64249fpga: region: fix use-after-free in child_regions_with_firmware()
CVE-2026-64220device property: set fwnode->secondary to NULL in fwnode_init()

Showing top 20 of 48 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64229

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