{
  "cveId": "CVE-2026-89581",
  "url": "https://patchblox.com/security/cve/CVE-2026-89581",
  "summary": "CVE-2026-89581 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-89581, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  bpf, x86: Fix per-CPU address resolution into an...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf, x86: Fix per-CPU address resolution into an extended register  The destination of the per-CPU address MOV is encoded in ModRM.reg, which is extended by REX.R, but the REX prefix is built with add_1mod(), which sets REX.B. REX.B extends ModRM.rm and SIB.base, and this instruction addresses memory as disp32 with no base, so the bit has no effect at all and the high register bit is simply lost.  Every is_ereg() destination therefore resolves to the wrong register, picking whichever one shares the low three bits:    R5 -\u003E RAX    R7 -\u003E RBP    R8 -\u003E RSI    R9 -\u003E RDI  With BPF_REG_5, whose reg2hex is 0, the emitted    65 49 03 04 25 \u003Coff\u003E\tadd %gs:\u003Coff\u003E,%rax  adds the per-CPU offset to RAX rather than R8. The destination keeps the unadjusted address and RAX is clobbered, so the program goes on to dereference a pointer that was never made per-CPU:    BUG: unable to handle page fault for address: 0000607e386a8894   RIP: bpf_prog_707837aafd2aa9ae_update_percpu_data\u002B0x93/0xc9   Call Trace:    __bpf_prog_test_run_raw_tp\u002B0x2dc/0x7d0    __flush_smp_call_function_queue\u002B0x1e9/0xc80   Kernel panic - not syncing: Fatal exception in interrupt  R5 is the mildest of the four, aliasing a scratch register and faulting at the store. R7 aliases RBP and would corrupt the frame pointer, R8 and R9 alias the argument registers.  Use add_2mod() so the register goes through REX.R, matching how add_2reg() places it in ModRM.reg and how emit_priv_frame_ptr() hardcodes 0x4c for the same instruction with R9. Encodings for the non-extended registers are unchanged.  Problem showed up when trying to resurrect BPF_GCC CI (selftests built with BPF_GCC).  This has gone unnoticed because clang reloads the address into R1 before each per-CPU access, so the destination is never an extended register. GCC keeps several per-CPU addresses live at once, and test_progs-bpf_gcc panics the kernel in global_percpu_data/init, where the address of a .percpu variable ends up in R5.",
  "published": "2026-09-11T20:19:42Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00129,
  "epssPercentile": 0.02523,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3187",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}