{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-50164", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-50164", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-11-07T09:31:41.012Z", "updatedAt": "2026-10-15T00:57:18.967Z", "importedAt": "2026-10-24T01:57:20.494Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "bpf: Fix overloading of MEM_UNINIT's meaning", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix overloading of MEM_UNINIT's meaning\n\nLonial reported an issue in the BPF verifier where check_mem_size_reg()\nhas the following code:\n\n if (!tnum_is_const(reg->var_off))\n /* For unprivileged variable accesses, disable raw\n * mode so that the program is required to\n * initialize all the memory that the helper could\n * just partially fill up.\n */\n meta = NULL;\n\nThis means that writes are not checked when the register containing the\nsize of the passed buffer has not a fixed size. Through this bug, a BPF\nprogram can write to a map which is marked as read-only, for example,\n.rodata global maps.\n\nThe problem is that MEM_UNINIT's initial meaning that \"the passed buffer\nto the BPF helper does not need to be initialized\" which was added back\nin commit 435faee1aae9 (\"bpf, verifier: add ARG_PTR_TO_RAW_STACK type\")\ngot overloaded over time with \"the passed buffer is being written to\".\n\nThe problem however is that checks such as the above which were added later\nvia 06c1c049721a (\"bpf: allow helpers access to variable memory\") set meta\nto NULL in order force the user to always initialize the passed buffer to\nthe helper. Due to the current double meaning of MEM_UNINIT, this bypasses\nverifier write checks to the memory (not boundary checks though) and only\nassumes the latter memory is read instead.\n\nFix this by reverting MEM_UNINIT back to its original meaning, and having\nMEM_WRITE as an annotation to BPF helpers in order to then trigger the\nBPF verifier checks for writing to memory.\n\nSome notes: check_arg_pair_ok() ensures that for ARG_CONST_SIZE{,_OR_ZERO}\nwe can access fn->arg_type[arg - 1] since it must contain a preceding\nARG_PTR_TO_MEM. For check_mem_reg() the meta argument can be removed\naltogether since we do check both BPF_READ and BPF_WRITE. Same for the\nequivalent check_kfunc_mem_size_reg().", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "97e6d7dab1ca4648821c790a2b7913d6d5d549db", "status": "affected", "versionType": "git", "lessThan": "43f4df339a4d375bedcad29a61ae6f0ee7a048f8" }, { "version": "97e6d7dab1ca4648821c790a2b7913d6d5d549db", "status": "affected", "versionType": "git", "lessThan": "48068ccaea957469f1adf78dfd2c1c9a7e18f0fe" }, { "version": "97e6d7dab1ca4648821c790a2b7913d6d5d549db", "status": "affected", "versionType": "git", "lessThan": "54bc31682660810af1bed7ca7a19f182df8d3df8" }, { "version": "97e6d7dab1ca4648821c790a2b7913d6d5d549db", "status": "affected", "versionType": "git", "lessThan": "8ea607330a39184f51737c6ae706db7fdca7628e" }, { "version": "6099a6c8a749a5c8d5f8b4c4342022a92072a02b", "status": "affected", "versionType": "git" }, { "version": "bfe25df63048edd4ceaf78a2fc755d5e2befc978", "status": "affected", "versionType": "git" }, { "version": "717c39718dbc4f7ebcbb7b625fb11851cd9007fe", "status": "affected", "versionType": "git" }, { "version": "5d0bba8232bf22ce13747cbfc8f696318ff01a50", "status": "affected", "versionType": "git" }, { "version": "70674d11d14eeecad90be4b409a22b902112ba32", "status": "affected", "versionType": "git" }, { "version": "a08d942ecbf46e23a192093f6983cb1d779f4fa8", "status": "affected", "versionType": "git" }, { "version": "5.15.45", "status": "affected", "versionType": "semver", "lessThan": "5.16" }, { "version": "5.17.13", "status": "affected", "versionType": "semver", "lessThan": "5.18" }, { "version": "5.18.2", "status": "affected", "versionType": "semver", "lessThan": "5.19" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.19" }, { "version": "6.1.125", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.59", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.11.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.11.*" }, { "version": "6.12", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }