CVE-2026-97942

{
  "id": "CVE-2026-97942",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-25T11:17:21.633",
  "lastModified": "2026-10-19T10:17:45.403",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/alternatives: Exclude text poking against change_page_attr()\n\nFrom time to time, the following BUG can be observed\nin the x86 alternatives patching code [0]:\n\n  > kernel BUG at arch/x86/kernel/alternative.c:2576!\n  > Oops: invalid opcode: 0000 [#1] SMP NOPTI\n  > CPU: 0 UID: 0 PID: 355 Comm: (udev-worker) Not tainted 7.1.3-1-default #1 PREEMPT(full) openSUSE Tumbleweed  8c1795b03ec64f997e57a8ad38b1161e3b98da64\n  > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022\n  > RIP: 0010:__text_poke+0x2aa/0x450\n  > Call Trace:\n  >  <TASK>\n  >  smp_text_poke_batch_finish+0x2a7/0x320\n  >  __static_call_transform+0xb7/0x220\n  >  arch_static_call_transform+0x5b/0xb0\n  >  __static_call_init+0xe9/0x270\n  >  static_call_module_notify+0x11f/0x150\n  >  notifier_call_chain+0x61/0xe0\n  >  blocking_notifier_call_chain_robust+0x63/0xc0\n  >  load_module+0x1c92/0x20c0\n  >  init_module_from_file+0xd8/0x140\n  >  idempotent_init_module+0x100/0x2f0\n  >  __x64_sys_finit_module+0x71/0xe0\n  >  do_syscall_64+0xe1/0x610\n  >  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nwhich matches the following BUG_ON() in alternative.c:\n\n\t/*\n\t * If something went wrong, crash and burn since recovery paths are not\n\t * implemented.\n\t */\n\tBUG_ON(!pages[0] || (cross_page_boundary && !pages[1]));\n\nThis can happen if vmalloc_to_page() fails, for any reason. Such can happen\nif text poking races with CPA, which can possibly result in the collapsing\nof page tables (or breaking of PMD hugepages). It is not a problem for most\nusers of vmalloc_to_page() (they solely own the vmalloc'd range) but, when\nCONFIG_ARCH_HAS_EXECMEM_ROX=y, various modules own a single execmem vmalloc\nrange, and can call set_memory_*() in parallel on it. This can happen to\nrace against __text_poke and cause havoc in vmalloc_to_page().\n\nFix it by excluding against CPA using the init_mm mmap read lock.\n\n[ dhansen: Fix up SoB ordering. The actual code flow here was:\n\t   Pedro=>Lorenzo=>Mike=>Me which is reflected in the SoB chain\n\t   now. I *believe* Mike simply picked up Lorenzo's update to\n\t   Pedro's post from the Link ]"
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "arch/x86/kernel/alternative.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "64f6a4e10c05ed527f0f24b7954964255e0d3535",
              "lessThan": "281e6f536f2f3f95d91938c5bd7ba9bcb4c1049d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "64f6a4e10c05ed527f0f24b7954964255e0d3535",
              "lessThan": "89c60435b90d32ab5e3a39da3ae73d463d07debe",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "64f6a4e10c05ed527f0f24b7954964255e0d3535",
              "lessThan": "1587d3394e254639cc36516256031334095e6ef3",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "arch/x86/kernel/alternative.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.15",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.53",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.7",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1587d3394e254639cc36516256031334095e6ef3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/281e6f536f2f3f95d91938c5bd7ba9bcb4c1049d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/89c60435b90d32ab5e3a39da3ae73d463d07debe",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}