{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-52452 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2023-52452 is a high-severity vulnerability in Linux kernel, published on 22 Feb 2024. 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-2023-52452 and fix it if it is affected.\n\nWhat it is: CVE-2023-52452 is a high-severity vulnerability in Linux kernel, published on 22 Feb 2024. 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-2023-52452 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-2023-52452/ (Markdown: https://insights.sbomify.com/CVE-2023-52452/index.md)","id":"CVE-2023-52452","markdown":"https://insights.sbomify.com/CVE-2023-52452/index.md","name":"CVE-2023-52452","record":{"aliases":["AZL-35905","BELL-CVE-2023-52452","DEBIAN-CVE-2023-52452","GHSA-445q-cj49-wrrx","ROOT-OS-DEBIAN-11-CVE-2023-52452","ROOT-OS-DEBIAN-12-CVE-2023-52452","ROOT-OS-UBUNTU-2204-CVE-2023-52452","UBUNTU-CVE-2023-52452"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel BPF","requires_auth":"low_privilege","summary":"Privileged BPF programs could inconsistently read uninitialized stack memory, potentially leaking sensitive kernel data.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-665","name":"Improper Initialization"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix accesses to uninit stack slots\n\nPrivileged programs are supposed to be able to read uninitialized stack\nmemory (ever since 6715df8d5) but, before this patch, these accesses\nwere permitted inconsistently. In particular, accesses were permitted\nabove state-\u003eallocated_stack, but not below it. In other words, if the\nstack was already \"large enough\", the access was permitted, but\notherwise the access was rejected instead of being allowed to \"grow the\nstack\". This undesired rejection was happening in two places:\n- in check_stack_slot_within_bounds()\n- in check_stack_range_initialized()\nThis patch arranges for these accesses to be permitted. A bunch of tests\nthat were relying on the old rejection had to change; all of them were\nchanged to add also run unprivileged, in which case the old behavior\npersists. One tests couldn't be updated - global_func16 - because it\ncan't run unprivileged for other reasons.\n\nThis patch also fixes the tracking of the stack size for variable-offset\nreads. This second fix is bundled in the same commit as the first one\nbecause they're inter-related. Before this patch, writes to the stack\nusing registers containing a variable offset (as opposed to registers\nwith fixed, known values) were not properly contributing to the\nfunction's needed stack size. As a result, it was possible for a program\nto verify, but then to attempt to read out-of-bounds data at runtime\nbecause a too small stack had been allocated for it.\n\nEach function tracks the size of the stack it needs in\nbpf_subprog_info.stack_depth, which is maintained by\nupdate_stack_depth(). For regular memory accesses, check_mem_access()\nwas calling update_state_depth() but it was passing in only the fixed\npart of the offset register, ignoring the variable offset. This was\nincorrect; the minimum possible value of that register should be used\ninstead.\n\nThis tracking is now fixed by centralizing the tracking of stack size in\ngrow_stack_state(), and by lifting the calls to grow_stack_state() to\ncheck_stack_access_within_bounds() as suggested by Andrii. The code is\nnow simpler and more convincingly tracks the correct maximum stack size.\ncheck_stack_range_initialized() can now rely on enough stack having been\nallocated for the access; this helps with the fix for the first issue.\n\nA few tests were changed to also check the stack depth computation. The\none that fails without this patch is verifier_var_off:stack_write_priv_vs_unpriv.","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":"bpf: Fix accesses to uninit stack slots","id":"CVE-2023-52452","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"information_disclosure","year":"2023"},"n_packages":0,"n_references":3,"next":{"headline":"hisi_acc_vfio_pci: Update migration data pointer correctly on saving/resume","id":"CVE-2023-52453"},"packages":[],"prev":{"headline":"powerpc/pseries/memhp: Fix access beyond end of drmem array","id":"CVE-2023-52451"},"products":["Linux"],"published":"2024-02-22","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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-23","vendors":["Linux"]},"summary":"Privileged BPF programs could inconsistently read uninitialized stack memory, potentially leaking sensitive kernel data.","url":"https://insights.sbomify.com/CVE-2023-52452/"}