242 lines
14 KiB
JSON
242 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-53108",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-06-09T07:44:35.385Z",
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"datePublished": "2026-06-24T16:30:42.707Z",
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"dateUpdated": "2026-11-06T16:24:00.661Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:26:39.730Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/64s: Fix unmap race with PMD migration entries\n\nThe following race is possible with migration swap entries or\ndevice-private THP entries. e.g. when move_pages is called on a PMD THP\npage, then there maybe an intermediate state, where PMD entry acts as\na migration swap entry (pmd_present() is true). Then if an munmap\nhappens at the same time, then this VM_BUG_ON() can happen in\npmdp_huge_get_and_clear_full().\n\nThis patch fixes that.\n\nThread A: move_pages() syscall\n add_folio_for_migration()\n mmap_read_lock(mm)\n folio_isolate_lru(folio)\n mmap_read_unlock(mm)\n\n do_move_pages_to_node()\n migrate_pages()\n try_to_migrate_one()\n spin_lock(ptl)\n set_pmd_migration_entry()\n pmdp_invalidate() # PMD: _PAGE_INVALID | _PAGE_PTE | pfn\n set_pmd_at() # PMD: migration swap entry (pmd_present=0)\n spin_unlock(ptl)\n [page copy phase] # <--- RACE WINDOW -->\n\nThread B: munmap()\n mmap_write_downgrade(mm)\n unmap_vmas() -> zap_pmd_range()\n zap_huge_pmd()\n __pmd_trans_huge_lock()\n pmd_is_huge(): # !pmd_present && !pmd_none -> TRUE (swap entry)\n pmd_lock() -> \t\t# spin_lock(ptl), waits for Thread A to release ptl\n pmdp_huge_get_and_clear_full()\n VM_BUG_ON(!pmd_present(*pmdp)) # HITS!\n\n[ 287.738700][ T1867] ------------[ cut here ]------------\n[ 287.743843][ T1867] kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:187!\ncpu 0x0: Vector: 700 (Program Check) at [c00000044037f4f0]\n pc: c000000000094ca4: pmdp_huge_get_and_clear_full+0x6c/0x23c\n lr: c000000000645dec: zap_huge_pmd+0xb0/0x868\n sp: c00000044037f790\n msr: 800000000282b033\n current = 0xc0000004032c1a00\n paca = 0xc000000004fe0000 irqmask: 0x03 irq_happened: 0x09\n pid = 1867, comm = a.out\nkernel BUG at :187!\nLinux version 6.19.0-12136-g14360d4f917c-dirty (powerpc64le-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40) #27 SMP PREEMPT Sun Feb 22 10:38:56 IST 2026\nenter ? for help\n[link register ] c000000000645dec zap_huge_pmd+0xb0/0x868\n[c00000044037f790] c00000044037f7d0 (unreliable)\n[c00000044037f7d0] c000000000645dcc zap_huge_pmd+0x90/0x868\n[c00000044037f840] c0000000005724cc unmap_page_range+0x176c/0x1f40\n[c00000044037fa00] c000000000572ea0 unmap_vmas+0xb0/0x1d8\n[c00000044037fa90] c0000000005af254 unmap_region+0xb4/0x128\n[c00000044037fb50] c0000000005af400 vms_complete_munmap_vmas+0x138/0x310\n[c00000044037fbe0] c0000000005b0f1c do_vmi_align_munmap+0x1ec/0x238\n[c00000044037fd30] c0000000005b3688 __vm_munmap+0x170/0x1f8\n[c00000044037fdf0] c000000000587f74 sys_munmap+0x2c/0x40\n[c00000044037fe10] c000000000032668 system_call_exception+0x128/0x350\n[c00000044037fe50] c00000000000d05c system_call_vectored_common+0x15c/0x2ec\n---- Exception: 3000 (System Call Vectored) at 0000000010064a2c\nSP (7fff9b1ee9c0) is in userspace\n0:mon> zh\n\ncommit a30b48bf1b24 (\"mm/migrate_device: implement THP migration of zone device pages\"),\nenabled migration for device-private PMD entries. Hence this is one\nother path where this warning could get trigger from.\n\n ------------[ cut here ]------------\n WARNING: arch/powerpc/mm/book3s64/hash_pgtable.c:199 at hash__pmd_hugepage_update+0x48/0x284, CPU#3: hmm-tests/1905\n Modules linked in: test_hmm\n CPU: 3 UID: 0 PID: 1905 Comm: hmm-tests Tainted: G B W L N 7.0.0-rc1-01438-g7e2f0ee7581c #21 PREEMPT\n Tainted: [B]=BAD_PAGE, [W]=WARN, [L]=SOFTLOCKUP, [N]=TEST\n Hardware name: IBM pSeries (emulated by qemu) POWER10 (architected) 0x801200 0xf000006 of:SLOF,git-ee03ae pSeries\n NIP [c000000000096b70] hash__pmd_hugepage_update+0x48/0x284\n LR [c000000000096e7c] hash__pmdp_huge_get_and_clear+0xd0/0xd4\n Call Trace:\n [c000000604707670] [c000000004e102b8] 0xc000000004e102b8 (unreliable)\n [c000000604707700] [c00000000064ec3c] set_pmd_migration_entry+0x414/0x498\n [c000000604707760] [c00000000063e5a4] migrate_vma_col\n---truncated---"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/powerpc/include/asm/book3s/64/pgtable.h",
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"arch/powerpc/mm/book3s64/pgtable.c"
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],
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"versions": [
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{
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"version": "75358ea359e7c0dfceb3c7b3d854570b4260cb7f",
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"lessThan": "3d4999bfbcbc5b801bfcf482c567380dd26ad268",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "75358ea359e7c0dfceb3c7b3d854570b4260cb7f",
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"lessThan": "6f571bf37da84ab822bf22341d48655312aaee20",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "75358ea359e7c0dfceb3c7b3d854570b4260cb7f",
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"lessThan": "5c8dd49f4a857aa40c4a8694930509d159feae24",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "75358ea359e7c0dfceb3c7b3d854570b4260cb7f",
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"lessThan": "09207dc57ab4cb8967e6cad55a37e15ff8523d41",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "75358ea359e7c0dfceb3c7b3d854570b4260cb7f",
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"lessThan": "829367e55012c053738ebe7db20c4a90d6609ece",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "75358ea359e7c0dfceb3c7b3d854570b4260cb7f",
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"lessThan": "bbcbf045d6c778e82b47a35fc8728387708e9a3d",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/powerpc/include/asm/book3s/64/pgtable.h",
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"arch/powerpc/mm/book3s64/pgtable.c"
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],
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"versions": [
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{
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"version": "5.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.10",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.8",
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"versionEndExcluding": "6.1.191"
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},
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"vulnerable": true,
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/3d4999bfbcbc5b801bfcf482c567380dd26ad268"
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},
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{
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"url": "https://git.kernel.org/stable/c/6f571bf37da84ab822bf22341d48655312aaee20"
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},
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{
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"url": "https://git.kernel.org/stable/c/5c8dd49f4a857aa40c4a8694930509d159feae24"
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},
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{
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"url": "https://git.kernel.org/stable/c/09207dc57ab4cb8967e6cad55a37e15ff8523d41"
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},
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{
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"url": "https://git.kernel.org/stable/c/829367e55012c053738ebe7db20c4a90d6609ece"
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},
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{
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"url": "https://git.kernel.org/stable/c/bbcbf045d6c778e82b47a35fc8728387708e9a3d"
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}
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],
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"title": "powerpc/64s: Fix unmap race with PMD migration entries",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-53108",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-11-06T16:18:59.795012Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-11-06T16:24:00.661Z"
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}
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}
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]
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}
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} |