In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without the CAP_SYS_ADMIN capability.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6 Patch, Vendor Advisory
- https://lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu%40gmail.com/ Patch
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6 Patch, Vendor Advisory
- https://lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu%40gmail.com/ Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.8 · linux, fedoraproject, debianNVD modified 2026-10-08 21:17
Affected (CPE criteria) 4
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
References 12
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6 Patch, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUVLBJKZMWA3E3YXSH4SZ7BOYGJP4GXP/ Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UL6CH5M5PRLMA3KPBX4LPUO6Z73GRISO/ Third Party Advisory
- https://lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu%40gmail.com/ Patch
- https://security.netapp.com/advisory/ntap-20210909-0001/ Third Party Advisory
- https://www.debian.org/security/2021/dsa-4978 Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6 Patch, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUVLBJKZMWA3E3YXSH4SZ7BOYGJP4GXP/ Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UL6CH5M5PRLMA3KPBX4LPUO6Z73GRISO/ Third Party Advisory
- https://lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu%40gmail.com/ Patch
- https://security.netapp.com/advisory/ntap-20210909-0001/ Third Party Advisory
- https://www.debian.org/security/2021/dsa-4978 Third Party Advisory