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Review reviewHigh

CVE-2021-47126

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions Reported by syzbot: HEAD commit: 90c911ad Merge tag 'fixes' of git://git.kernel.org/pub/scm.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master dashboard link: https://syzkaller.appspot.com/bug?extid=123aa35098fd3c000eb7 compiler: Debian clang version 11.0.1-2 ================================================================== BUG: KASAN: slab-out-of-bounds in fib6_nh_get_excptn_bucket net/ipv6/route.c:1604 [inline] BUG: KASA...

CVSS
7.8
EPSS
0.24%
15.7% percentile
CISA KEV
Not listed
Published
2024.03.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions Reported by syzbot: HEAD commit: 90c911ad Merge tag 'fixes' of git://git.kernel.org/pub/scm.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master dashboard link: https://syzkaller.appspot.com/bug?extid=123aa35098fd3c000eb7 compiler: Debian clang version 11.0.1-2 ================================================================== BUG: KASAN: slab-out-of-bounds in fib6_nh_get_excptn_bucket net/ipv6/route.c:1604 [inline] BUG: KASA...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 < 7ba7fa78a92dc410b6f93ed73075ab669c3a0b59, >= f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 < 09870235827451409ff546b073d754a19fd17e2e, >= f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 < 0a462e25ef0f7ab305081a08d435bbd1f13c0a94, >= f88d8ea67fbdbac7a64bfa6ed9a2ba27bb822f74 < 821bbf79fe46a8b1d18aa456e8ed0a3c208c3754, >= 5.3, >= 5.3 < 5.4.125, >= 5.5 < 5.10.43, >= 5.11 < 5.12.10, 5.13
Fixed versions
5.4.125, 5.10.43, 5.12.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-125