{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-53680", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-01-09T09:49:29.723Z", "datePublished": "2025-01-11T12:25:21.794Z", "dateUpdated": "2026-05-11T20:53:36.270Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:53:36.270Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix UB due to uninitialized stack access in ip_vs_protocol_init()\n\nUnder certain kernel configurations when building with Clang/LLVM, the\ncompiler does not generate a return or jump as the terminator\ninstruction for ip_vs_protocol_init(), triggering the following objtool\nwarning during build time:\n\n vmlinux.o: warning: objtool: ip_vs_protocol_init() falls through to next function __initstub__kmod_ip_vs_rr__935_123_ip_vs_rr_init6()\n\nAt runtime, this either causes an oops when trying to load the ipvs\nmodule or a boot-time panic if ipvs is built-in. This same issue has\nbeen reported by the Intel kernel test robot previously.\n\nDigging deeper into both LLVM and the kernel code reveals this to be a\nundefined behavior problem. ip_vs_protocol_init() uses a on-stack buffer\nof 64 chars to store the registered protocol names and leaves it\nuninitialized after definition. The function calls strnlen() when\nconcatenating protocol names into the buffer. With CONFIG_FORTIFY_SOURCE\nstrnlen() performs an extra step to check whether the last byte of the\ninput char buffer is a null character (commit 3009f891bb9f (\"fortify:\nAllow strlen() and strnlen() to pass compile-time known lengths\")).\nThis, together with possibly other configurations, cause the following\nIR to be generated:\n\n define hidden i32 @ip_vs_protocol_init() local_unnamed_addr #5 section \".init.text\" align 16 !kcfi_type !29 {\n %1 = alloca [64 x i8], align 16\n ...\n\n 14: ; preds = %11\n %15 = getelementptr inbounds i8, ptr %1, i64 63\n %16 = load i8, ptr %15, align 1\n %17 = tail call i1 @llvm.is.constant.i8(i8 %16)\n %18 = icmp eq i8 %16, 0\n %19 = select i1 %17, i1 %18, i1 false\n br i1 %19, label %20, label %23\n\n 20: ; preds = %14\n %21 = call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #23\n ...\n\n 23: ; preds = %14, %11, %20\n %24 = call i64 @strnlen(ptr noundef nonnull dereferenceable(1) %1, i64 noundef 64) #24\n ...\n }\n\nThe above code calculates the address of the last char in the buffer\n(value %15) and then loads from it (value %16). Because the buffer is\nnever initialized, the LLVM GVN pass marks value %16 as undefined:\n\n %13 = getelementptr inbounds i8, ptr %1, i64 63\n br i1 undef, label %14, label %17\n\nThis gives later passes (SCCP, in particular) more DCE opportunities by\npropagating the undef value further, and eventually removes everything\nafter the load on the uninitialized stack location:\n\n define hidden i32 @ip_vs_protocol_init() local_unnamed_addr #0 section \".init.text\" align 16 !kcfi_type !11 {\n %1 = alloca [64 x i8], align 16\n ...\n\n 12: ; preds = %11\n %13 = getelementptr inbounds i8, ptr %1, i64 63\n unreachable\n }\n\nIn this way, the generated native code will just fall through to the\nnext function, as LLVM does not generate any code for the unreachable IR\ninstruction and leaves the function without a terminator.\n\nZero the on-stack buffer to avoid this possible UB." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/ipvs/ip_vs_proto.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "31d1ddc1ce8e8d3f101a679243abb42a313ee88a", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0b2cbed82b7c6504a8a0fbd181f92dd56b432c12", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "d6e1776f51c95827142f1d7064118e255e2deec1", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "664d0feab92495b6a27edc3d1119e232c0fe8b2b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "124834133b32f9386bb2d8581d9ab92f65e951e4", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "48130002e64fd191b7d18efeb4d253fcc23e4688", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "146b6f1112eb30a19776d6c323c994e9d67790db", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/ipvs/ip_vs_proto.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.287", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.231", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.174", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.120", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.66", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.5", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.4.287" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.231" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.174" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.120" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.66" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/31d1ddc1ce8e8d3f101a679243abb42a313ee88a" }, { "url": "https://git.kernel.org/stable/c/0b2cbed82b7c6504a8a0fbd181f92dd56b432c12" }, { "url": "https://git.kernel.org/stable/c/d6e1776f51c95827142f1d7064118e255e2deec1" }, { "url": "https://git.kernel.org/stable/c/664d0feab92495b6a27edc3d1119e232c0fe8b2b" }, { "url": "https://git.kernel.org/stable/c/124834133b32f9386bb2d8581d9ab92f65e951e4" }, { "url": "https://git.kernel.org/stable/c/48130002e64fd191b7d18efeb4d253fcc23e4688" }, { "url": "https://git.kernel.org/stable/c/146b6f1112eb30a19776d6c323c994e9d67790db" } ], "title": "ipvs: fix UB due to uninitialized stack access in ip_vs_protocol_init()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:48:17.936Z" } } ] } }