{"api_version":"1","generated_at":"2026-06-27T07:50:29+00:00","cve":"CVE-2026-53134","urls":{"html":"https://cve.report/CVE-2026-53134","api":"https://cve.report/api/cve/CVE-2026-53134.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53134","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53134"},"summary":{"title":"netfilter: nft_fib: fix stale stack leak via the OIFNAME register","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_fib: fix stale stack leak via the OIFNAME register\n\nFor NFT_FIB_RESULT_OIFNAME the destination register is declared with\nlen = IFNAMSIZ (four 32-bit registers), but on the lookup-fail,\nRTN_LOCAL and oif-mismatch paths nft_fib{4,6}_eval() only writes one\nregister via \"*dest = 0\". The remaining three registers are left as\nwhatever was on the stack in nft_do_chain()'s struct nft_regs, and a\ndownstream expression that loads the register span can leak that\nuninitialised kernel stack to userspace.\n\nThe NFTA_FIB_F_PRESENT existence check has the same shape: it is only\nmeaningful for NFT_FIB_RESULT_OIF, yet it was accepted for any result type\nwhile the eval stores a single byte via nft_reg_store8(), leaving the rest\nof the declared span stale.\n\nFix both:\n\n - replace the bare \"*dest = 0\" in the eval with nft_fib_store_result(),\n   which strscpy_pad()s the whole IFNAMSIZ for OIFNAME (and is already\n   used on the other early-return path), and\n\n - restrict NFTA_FIB_F_PRESENT to NFT_FIB_RESULT_OIF and declare its\n   destination as a single u8, so the marked span matches the one byte\n   the eval writes.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:30","updated_at":"2026-06-25 09:16:30"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c","name":"https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171","name":"https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50","name":"https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3544210609f6d1db282bbdeca639104ef624c393","name":"https://git.kernel.org/stable/c/3544210609f6d1db282bbdeca639104ef624c393","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eb8a8124484dbc3c2b543e207da39bbccb703d31","name":"https://git.kernel.org/stable/c/eb8a8124484dbc3c2b543e207da39bbccb703d31","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e","name":"https://git.kernel.org/stable/c/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8c84885e9790823828bb8084736ea15769b1ac16","name":"https://git.kernel.org/stable/c/8c84885e9790823828bb8084736ea15769b1ac16","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d19ddef8c327a4773ff81f8e51027d1e0b4cf069","name":"https://git.kernel.org/stable/c/d19ddef8c327a4773ff81f8e51027d1e0b4cf069","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53134","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53134","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 6744e49fe51bfba26522acc2d0e9703cb41d8e50 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 eca18feed38b3377a2ec5d1f22af1170c55d0171 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 d19ddef8c327a4773ff81f8e51027d1e0b4cf069 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 eb8a8124484dbc3c2b543e207da39bbccb703d31 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53134","cve":"CVE-2026-53134","epss":"0.001760000","percentile":"0.073840000","score_date":"2026-06-26","updated_at":"2026-06-27 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the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_fib: fix stale stack leak via the OIFNAME register\n\nFor NFT_FIB_RESULT_OIFNAME the destination register is declared with\nlen = IFNAMSIZ (four 32-bit registers), but on the lookup-fail,\nRTN_LOCAL and oif-mismatch paths nft_fib{4,6}_eval() only writes one\nregister via \"*dest = 0\". The remaining three registers are left as\nwhatever was on the stack in nft_do_chain()'s struct nft_regs, and a\ndownstream expression that loads the register span can leak that\nuninitialised kernel stack to userspace.\n\nThe NFTA_FIB_F_PRESENT existence check has the same shape: it is only\nmeaningful for NFT_FIB_RESULT_OIF, yet it was accepted for any result type\nwhile the eval stores a single byte via nft_reg_store8(), leaving the rest\nof the declared span stale.\n\nFix both:\n\n - replace the bare \"*dest = 0\" in the eval with nft_fib_store_result(),\n   which strscpy_pad()s the whole IFNAMSIZ for OIFNAME (and is already\n   used on the other early-return path), and\n\n - restrict NFTA_FIB_F_PRESENT to NFT_FIB_RESULT_OIF and declare its\n   destination as a single u8, so the marked span matches the one byte\n   the eval writes."}],"providerMetadata":{"dateUpdated":"2026-06-25T08:38:23.348Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/6744e49fe51bfba26522acc2d0e9703cb41d8e50"},{"url":"https://git.kernel.org/stable/c/eca18feed38b3377a2ec5d1f22af1170c55d0171"},{"url":"https://git.kernel.org/stable/c/d19ddef8c327a4773ff81f8e51027d1e0b4cf069"},{"url":"https://git.kernel.org/stable/c/eb8a8124484dbc3c2b543e207da39bbccb703d31"},{"url":"https://git.kernel.org/stable/c/8c84885e9790823828bb8084736ea15769b1ac16"},{"url":"https://git.kernel.org/stable/c/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e"},{"url":"https://git.kernel.org/stable/c/3544210609f6d1db282bbdeca639104ef624c393"},{"url":"https://git.kernel.org/stable/c/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c"}],"title":"netfilter: nft_fib: fix stale stack leak via the OIFNAME register","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53134","datePublished":"2026-06-25T08:38:23.348Z","dateReserved":"2026-06-09T07:44:35.386Z","dateUpdated":"2026-06-25T08:38:23.348Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:30","lastModifiedDate":"2026-06-25 09:16:30","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53134","Ordinal":"1","Title":"netfilter: nft_fib: fix stale stack leak via the OIFNAME registe","CVE":"CVE-2026-53134","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53134","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_fib: fix stale stack leak via the OIFNAME register\n\nFor NFT_FIB_RESULT_OIFNAME the destination register is declared with\nlen = IFNAMSIZ (four 32-bit registers), but on the lookup-fail,\nRTN_LOCAL and oif-mismatch paths nft_fib{4,6}_eval() only writes one\nregister via \"*dest = 0\". The remaining three registers are left as\nwhatever was on the stack in nft_do_chain()'s struct nft_regs, and a\ndownstream expression that loads the register span can leak that\nuninitialised kernel stack to userspace.\n\nThe NFTA_FIB_F_PRESENT existence check has the same shape: it is only\nmeaningful for NFT_FIB_RESULT_OIF, yet it was accepted for any result type\nwhile the eval stores a single byte via nft_reg_store8(), leaving the rest\nof the declared span stale.\n\nFix both:\n\n - replace the bare \"*dest = 0\" in the eval with nft_fib_store_result(),\n   which strscpy_pad()s the whole IFNAMSIZ for OIFNAME (and is already\n   used on the other early-return path), and\n\n - restrict NFTA_FIB_F_PRESENT to NFT_FIB_RESULT_OIF and declare its\n   destination as a single u8, so the marked span matches the one byte\n   the eval writes.","Type":"Description","Title":"netfilter: nft_fib: fix stale stack leak via the OIFNAME registe"}]}}}