{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-38050 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-38050 is a medium-severity vulnerability in Linux kernel, published on 18 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-38050 and fix it if it is affected.\n\nWhat it is: CVE-2025-38050 is a medium-severity vulnerability in Linux kernel, published on 18 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-38050 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-38050/ (Markdown: https://insights.sbomify.com/CVE-2025-38050/index.md)","id":"CVE-2025-38050","markdown":"https://insights.sbomify.com/CVE-2025-38050/index.md","name":"CVE-2025-38050","record":{"aliases":["BELL-CVE-2025-38050","GHSA-4p87-j93j-28j5","UBUNTU-CVE-2025-38050"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A race condition in the Linux kernel's hugetlb subsystem causes a NULL pointer dereference, leading to a system crash.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: fix kernel NULL pointer dereference when replacing free hugetlb folios\n\nA kernel crash was observed when replacing free hugetlb folios:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000028\nPGD 0 P4D 0\nOops: Oops: 0000 [#1] SMP NOPTI\nCPU: 28 UID: 0 PID: 29639 Comm: test_cma.sh Tainted 6.15.0-rc6-zp #41 PREEMPT(voluntary)\nRIP: 0010:alloc_and_dissolve_hugetlb_folio+0x1d/0x1f0\nRSP: 0018:ffffc9000b30fa90 EFLAGS: 00010286\nRAX: 0000000000000000 RBX: 0000000000342cca RCX: ffffea0043000000\nRDX: ffffc9000b30fb08 RSI: ffffea0043000000 RDI: 0000000000000000\nRBP: ffffc9000b30fb20 R08: 0000000000001000 R09: 0000000000000000\nR10: ffff88886f92eb00 R11: 0000000000000000 R12: ffffea0043000000\nR13: 0000000000000000 R14: 00000000010c0200 R15: 0000000000000004\nFS:  00007fcda5f14740(0000) GS:ffff8888ec1d8000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000028 CR3: 0000000391402000 CR4: 0000000000350ef0\nCall Trace:\n\u003cTASK\u003e\n replace_free_hugepage_folios+0xb6/0x100\n alloc_contig_range_noprof+0x18a/0x590\n ? srso_return_thunk+0x5/0x5f\n ? down_read+0x12/0xa0\n ? srso_return_thunk+0x5/0x5f\n cma_range_alloc.constprop.0+0x131/0x290\n __cma_alloc+0xcf/0x2c0\n cma_alloc_write+0x43/0xb0\n simple_attr_write_xsigned.constprop.0.isra.0+0xb2/0x110\n debugfs_attr_write+0x46/0x70\n full_proxy_write+0x62/0xa0\n vfs_write+0xf8/0x420\n ? srso_return_thunk+0x5/0x5f\n ? filp_flush+0x86/0xa0\n ? srso_return_thunk+0x5/0x5f\n ? filp_close+0x1f/0x30\n ? srso_return_thunk+0x5/0x5f\n ? do_dup2+0xaf/0x160\n ? srso_return_thunk+0x5/0x5f\n ksys_write+0x65/0xe0\n do_syscall_64+0x64/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThere is a potential race between __update_and_free_hugetlb_folio() and\nreplace_free_hugepage_folios():\n\nCPU1                              CPU2\n__update_and_free_hugetlb_folio   replace_free_hugepage_folios\n                                    folio_test_hugetlb(folio)\n                                    -- It's still hugetlb folio.\n\n  __folio_clear_hugetlb(folio)\n  hugetlb_free_folio(folio)\n                                    h = folio_hstate(folio)\n                                    -- Here, h is NULL pointer\n\nWhen the above race condition occurs, folio_hstate(folio) returns NULL,\nand subsequent access to this NULL pointer will cause the system to crash.\nTo resolve this issue, execute folio_hstate(folio) under the protection\nof the hugetlb_lock lock, ensuring that folio_hstate(folio) does not\nreturn NULL.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"mm/hugetlb: fix kernel NULL pointer dereference when replacing free hugetlb folios","id":"CVE-2025-38050","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2025"},"n_packages":0,"n_references":2,"next":{"headline":"smb: client: Fix use-after-free in cifs_fill_dirent","id":"CVE-2025-38051"},"packages":[],"prev":{"headline":"x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors","id":"CVE-2025-38049"},"products":["Linux"],"published":"2025-06-18","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A race condition in the Linux kernel's hugetlb subsystem causes a NULL pointer dereference, leading to a system crash.","url":"https://insights.sbomify.com/CVE-2025-38050/"}