{"id":"CVE-2021-47376","state":"PUBLISHED","title":"bpf: Add oversize check before call kvcalloc()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Add oversize check before call kvcalloc()\n\nCommit 7661809d493b (\"mm: don't allow oversized kvmalloc() calls\") add the\noversize check. When the allocation is larger than what kmalloc() supports,\nthe following warning triggered:\n\nWARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597\nModules linked in:\nCPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597\nCall Trace:\n kvmalloc include/linux/mm.h:806 [inline]\n kvmalloc_array include/linux/mm.h:824 [inline]\n kvcalloc include/linux/mm.h:829 [inline]\n check_btf_line kernel/bpf/verifier.c:9925 [inline]\n check_btf_info kernel/bpf/verifier.c:10049 [inline]\n bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759\n bpf_prog_load kernel/bpf/syscall.c:2301 [inline]\n __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587\n __do_sys_bpf kernel/bpf/syscall.c:4691 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:4689 [inline]\n __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae","publishedAt":"2024-05-21T15:03:39.738Z","updatedAt":"2026-05-11T13:53:30.823Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"93937596e0652d50973f9dc944fea1694ac8cdfd","versionType":"git"},{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"6345a0bee80139ea00a341c4202ebfd1534b5eb0","versionType":"git"},{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"b5fe7cdfee5901ce5513c30e554d51536e003bde","versionType":"git"},{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"0e6491b559704da720f6da09dd0a52c4df44c514","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"5.4.150","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.70","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.9","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"references":["https://git.kernel.org/stable/c/93937596e0652d50973f9dc944fea1694ac8cdfd","https://git.kernel.org/stable/c/6345a0bee80139ea00a341c4202ebfd1534b5eb0","https://git.kernel.org/stable/c/b5fe7cdfee5901ce5513c30e554d51536e003bde","https://git.kernel.org/stable/c/0e6491b559704da720f6da09dd0a52c4df44c514"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47376.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47376","state":"PUBLISHED","datePublished":"2024-05-21T15:03:39.738Z","dateUpdated":"2026-05-11T13:53:30.823Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:58:30.811Z"},"containers":{"cna":{"title":"bpf: Add oversize check before call kvcalloc()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Add oversize check before call kvcalloc()\n\nCommit 7661809d493b (\"mm: don't allow oversized kvmalloc() calls\") add the\noversize check. When the allocation is larger than what kmalloc() supports,\nthe following warning triggered:\n\nWARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597\nModules linked in:\nCPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597\nCall Trace:\n kvmalloc include/linux/mm.h:806 [inline]\n kvmalloc_array include/linux/mm.h:824 [inline]\n kvcalloc include/linux/mm.h:829 [inline]\n check_btf_line kernel/bpf/verifier.c:9925 [inline]\n check_btf_info kernel/bpf/verifier.c:10049 [inline]\n bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759\n bpf_prog_load kernel/bpf/syscall.c:2301 [inline]\n __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587\n __do_sys_bpf kernel/bpf/syscall.c:4691 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:4689 [inline]\n __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"93937596e0652d50973f9dc944fea1694ac8cdfd","versionType":"git"},{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"6345a0bee80139ea00a341c4202ebfd1534b5eb0","versionType":"git"},{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"b5fe7cdfee5901ce5513c30e554d51536e003bde","versionType":"git"},{"version":"c454a46b5efd8eff8880e88ece2976e60a26bf35","status":"affected","lessThan":"0e6491b559704da720f6da09dd0a52c4df44c514","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"5.4.150","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.70","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.14.9","status":"unaffected","lessThanOrEqual":"5.14.*","versionType":"semver"},{"version":"5.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/verifier.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/93937596e0652d50973f9dc944fea1694ac8cdfd"},{"url":"https://git.kernel.org/stable/c/6345a0bee80139ea00a341c4202ebfd1534b5eb0"},{"url":"https://git.kernel.org/stable/c/b5fe7cdfee5901ce5513c30e554d51536e003bde"},{"url":"https://git.kernel.org/stable/c/0e6491b559704da720f6da09dd0a52c4df44c514"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:53:30.823Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.4.150"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.10.70"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.14.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-06-11T18:56:40.431373Z","id":"CVE-2021-47376","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-11T18:57:16.694Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/93937596e0652d50973f9dc944fea1694ac8cdfd","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/6345a0bee80139ea00a341c4202ebfd1534b5eb0","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/b5fe7cdfee5901ce5513c30e554d51536e003bde","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/0e6491b559704da720f6da09dd0a52c4df44c514","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:32:08.600Z"}}]}}}