# CVE-2021-47376: linux: In the Linux kernel, the following vulnerability has been resolved:  bpf: Add oversize check before call kvcalloc()...

CVE-2021-47376 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47376, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47376
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  bpf: Add oversize check before call kvcalloc()  Commit 7661809d493b ("mm: don't allow oversized kvmalloc() calls") add the oversize check. When the allocation is larger than what kmalloc() supports, the following warning triggered:  WARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597 Modules linked in: CPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597 Call Trace:  kvmalloc include/linux/mm.h:806 [inline]  kvmalloc_array include/linux/mm.h:824 [inline]  kvcalloc include/linux/mm.h:829 [inline]  check_btf_line kernel/bpf/verifier.c:9925 [inline]  check_btf_info kernel/bpf/verifier.c:10049 [inline]  bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759  bpf_prog_load kernel/bpf/syscall.c:2301 [inline]  __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587  __do_sys_bpf kernel/bpf/syscall.c:4691 [inline]  __se_sys_bpf kernel/bpf/syscall.c:4689 [inline]  __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe+0x44/0xae

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.9-1 | [DEBIAN-CVE-2021-47376](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47376.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.9-1 | [DEBIAN-CVE-2021-47376](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47376.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.9-1 | [DEBIAN-CVE-2021-47376](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47376.md) | May 21, 2024 |

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