{"api_version":"1","generated_at":"2026-04-25T15:33:53+00:00","cve":"CVE-2026-31654","urls":{"html":"https://cve.report/CVE-2026-31654","api":"https://cve.report/api/cve/CVE-2026-31654.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31654","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31654"},"summary":{"title":"mm/vma: fix memory leak in __mmap_region()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vma: fix memory leak in __mmap_region()\n\ncommit 605f6586ecf7 (\"mm/vma: do not leak memory when .mmap_prepare\nswaps the file\") handled the success path by skipping get_file() via\nfile_doesnt_need_get, but missed the error path.\n\nWhen /dev/zero is mmap'd with MAP_SHARED, mmap_zero_prepare() calls\nshmem_zero_setup_desc() which allocates a new shmem file to back the\nmapping. If __mmap_new_vma() subsequently fails, this replacement\nfile is never fput()'d - the original is released by\nksys_mmap_pgoff(), but nobody releases the new one.\n\nAdd fput() for the swapped file in the error path.\n\nReproducible with fault injection.\n\nFAULT_INJECTION: forcing a failure.\nname failslab, interval 1, probability 0, space 0, times 1\nCPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n <TASK>\n dump_stack_lvl+0x164/0x1f0\n should_fail_ex+0x525/0x650\n should_failslab+0xdf/0x140\n kmem_cache_alloc_noprof+0x78/0x630\n vm_area_alloc+0x24/0x160\n __mmap_region+0xf6b/0x2660\n mmap_region+0x2eb/0x3a0\n do_mmap+0xc79/0x1240\n vm_mmap_pgoff+0x252/0x4c0\n ksys_mmap_pgoff+0xf8/0x120\n __x64_sys_mmap+0x12a/0x190\n do_syscall_64+0xa9/0x580\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n </TASK>\n\nkmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nBUG: memory leak\nunreferenced object 0xffff8881118aca80 (size 360):\n  comm \"syz.7.14\", pid 366, jiffies 4294913255\n  hex dump (first 32 bytes):\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n    ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff  .........(M.....\n  backtrace (crc db0f53bc):\n    kmem_cache_alloc_noprof+0x3ab/0x630\n    alloc_empty_file+0x5a/0x1e0\n    alloc_file_pseudo+0x135/0x220\n    __shmem_file_setup+0x274/0x420\n    shmem_zero_setup_desc+0x9c/0x170\n    mmap_zero_prepare+0x123/0x140\n    __mmap_region+0xdda/0x2660\n    mmap_region+0x2eb/0x3a0\n    do_mmap+0xc79/0x1240\n    vm_mmap_pgoff+0x252/0x4c0\n    ksys_mmap_pgoff+0xf8/0x120\n    __x64_sys_mmap+0x12a/0x190\n    do_syscall_64+0xa9/0x580\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFound by syzkaller.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-24 15:16:44","updated_at":"2026-04-24 17:51:40"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/61fc8eaf2ab214b32c7bce52597c80cf0ca41ada","name":"https://git.kernel.org/stable/c/61fc8eaf2ab214b32c7bce52597c80cf0ca41ada","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/894f99eb535edc4514f756818f3c4f688ba53a59","name":"https://git.kernel.org/stable/c/894f99eb535edc4514f756818f3c4f688ba53a59","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31654","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31654","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 605f6586ecf78395f0185ab24c368fb46a06e434 61fc8eaf2ab214b32c7bce52597c80cf0ca41ada git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 605f6586ecf78395f0185ab24c368fb46a06e434 894f99eb535edc4514f756818f3c4f688ba53a59 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.13 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["mm/vma.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"61fc8eaf2ab214b32c7bce52597c80cf0ca41ada","status":"affected","version":"605f6586ecf78395f0185ab24c368fb46a06e434","versionType":"git"},{"lessThan":"894f99eb535edc4514f756818f3c4f688ba53a59","status":"affected","version":"605f6586ecf78395f0185ab24c368fb46a06e434","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["mm/vma.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.19"},{"lessThan":"6.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.13","versionStartIncluding":"6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vma: fix memory leak in __mmap_region()\n\ncommit 605f6586ecf7 (\"mm/vma: do not leak memory when .mmap_prepare\nswaps the file\") handled the success path by skipping get_file() via\nfile_doesnt_need_get, but missed the error path.\n\nWhen /dev/zero is mmap'd with MAP_SHARED, mmap_zero_prepare() calls\nshmem_zero_setup_desc() which allocates a new shmem file to back the\nmapping. If __mmap_new_vma() subsequently fails, this replacement\nfile is never fput()'d - the original is released by\nksys_mmap_pgoff(), but nobody releases the new one.\n\nAdd fput() for the swapped file in the error path.\n\nReproducible with fault injection.\n\nFAULT_INJECTION: forcing a failure.\nname failslab, interval 1, probability 0, space 0, times 1\nCPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n <TASK>\n dump_stack_lvl+0x164/0x1f0\n should_fail_ex+0x525/0x650\n should_failslab+0xdf/0x140\n kmem_cache_alloc_noprof+0x78/0x630\n vm_area_alloc+0x24/0x160\n __mmap_region+0xf6b/0x2660\n mmap_region+0x2eb/0x3a0\n do_mmap+0xc79/0x1240\n vm_mmap_pgoff+0x252/0x4c0\n ksys_mmap_pgoff+0xf8/0x120\n __x64_sys_mmap+0x12a/0x190\n do_syscall_64+0xa9/0x580\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n </TASK>\n\nkmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nBUG: memory leak\nunreferenced object 0xffff8881118aca80 (size 360):\n  comm \"syz.7.14\", pid 366, jiffies 4294913255\n  hex dump (first 32 bytes):\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n    ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff  .........(M.....\n  backtrace (crc db0f53bc):\n    kmem_cache_alloc_noprof+0x3ab/0x630\n    alloc_empty_file+0x5a/0x1e0\n    alloc_file_pseudo+0x135/0x220\n    __shmem_file_setup+0x274/0x420\n    shmem_zero_setup_desc+0x9c/0x170\n    mmap_zero_prepare+0x123/0x140\n    __mmap_region+0xdda/0x2660\n    mmap_region+0x2eb/0x3a0\n    do_mmap+0xc79/0x1240\n    vm_mmap_pgoff+0x252/0x4c0\n    ksys_mmap_pgoff+0xf8/0x120\n    __x64_sys_mmap+0x12a/0x190\n    do_syscall_64+0xa9/0x580\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFound by syzkaller."}],"providerMetadata":{"dateUpdated":"2026-04-24T14:45:06.387Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/61fc8eaf2ab214b32c7bce52597c80cf0ca41ada"},{"url":"https://git.kernel.org/stable/c/894f99eb535edc4514f756818f3c4f688ba53a59"}],"title":"mm/vma: fix memory leak in __mmap_region()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31654","datePublished":"2026-04-24T14:45:06.387Z","dateReserved":"2026-03-09T15:48:24.129Z","dateUpdated":"2026-04-24T14:45:06.387Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-24 15:16:44","lastModifiedDate":"2026-04-24 17:51:40","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31654","Ordinal":"1","Title":"mm/vma: fix memory leak in __mmap_region()","CVE":"CVE-2026-31654","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31654","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vma: fix memory leak in __mmap_region()\n\ncommit 605f6586ecf7 (\"mm/vma: do not leak memory when .mmap_prepare\nswaps the file\") handled the success path by skipping get_file() via\nfile_doesnt_need_get, but missed the error path.\n\nWhen /dev/zero is mmap'd with MAP_SHARED, mmap_zero_prepare() calls\nshmem_zero_setup_desc() which allocates a new shmem file to back the\nmapping. If __mmap_new_vma() subsequently fails, this replacement\nfile is never fput()'d - the original is released by\nksys_mmap_pgoff(), but nobody releases the new one.\n\nAdd fput() for the swapped file in the error path.\n\nReproducible with fault injection.\n\nFAULT_INJECTION: forcing a failure.\nname failslab, interval 1, probability 0, space 0, times 1\nCPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n <TASK>\n dump_stack_lvl+0x164/0x1f0\n should_fail_ex+0x525/0x650\n should_failslab+0xdf/0x140\n kmem_cache_alloc_noprof+0x78/0x630\n vm_area_alloc+0x24/0x160\n __mmap_region+0xf6b/0x2660\n mmap_region+0x2eb/0x3a0\n do_mmap+0xc79/0x1240\n vm_mmap_pgoff+0x252/0x4c0\n ksys_mmap_pgoff+0xf8/0x120\n __x64_sys_mmap+0x12a/0x190\n do_syscall_64+0xa9/0x580\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n </TASK>\n\nkmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nBUG: memory leak\nunreferenced object 0xffff8881118aca80 (size 360):\n  comm \"syz.7.14\", pid 366, jiffies 4294913255\n  hex dump (first 32 bytes):\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n    ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff  .........(M.....\n  backtrace (crc db0f53bc):\n    kmem_cache_alloc_noprof+0x3ab/0x630\n    alloc_empty_file+0x5a/0x1e0\n    alloc_file_pseudo+0x135/0x220\n    __shmem_file_setup+0x274/0x420\n    shmem_zero_setup_desc+0x9c/0x170\n    mmap_zero_prepare+0x123/0x140\n    __mmap_region+0xdda/0x2660\n    mmap_region+0x2eb/0x3a0\n    do_mmap+0xc79/0x1240\n    vm_mmap_pgoff+0x252/0x4c0\n    ksys_mmap_pgoff+0xf8/0x120\n    __x64_sys_mmap+0x12a/0x190\n    do_syscall_64+0xa9/0x580\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFound by syzkaller.","Type":"Description","Title":"mm/vma: fix memory leak in __mmap_region()"}]}}}