# CVE-2021-47291: linux: In the Linux kernel, the following vulnerability has been resolved:  ipv6: fix another slab-out-of-bounds in fib6_nh_...

CVE-2021-47291 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47291, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47291
- Priority: High
- CVSS: 7.1 (high)
- 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:  ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions  While running the self-tests on a KASAN enabled kernel, I observed a slab-out-of-bounds splat very similar to the one reported in commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in  fib6_nh_flush_exceptions").  We additionally need to take care of fib6_metrics initialization failure when the caller provides an nh.  The fix is similar, explicitly free the route instead of calling fib6_info_release on a half-initialized object.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47291](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47291.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47291](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47291.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47291](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47291.md) | May 21, 2024 |

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