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Fencer Vulns
medium 5.5

CVE-2024-49888 json

bpf: Fix a sdiv overflow issue

published 2024-10-21 2 y ago modified 2026-10-21 19 d ago also EUVD-2024-43588

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix a sdiv overflow issue

Zac Ecob reported a problem where a bpf program may cause kernel crash due to the following error: Oops: divide error: 0000 [#1] PREEMPT SMP KASAN PTI

The failure is due to the below signed divide: LLONG_MIN/-1 where LLONG_MIN equals to -9,223,372,036,854,775,808. LLONG_MIN/-1 is supposed to give a positive number 9,223,372,036,854,775,808, but it is impossible since for 64-bit system, the maximum positive number is 9,223,372,036,854,775,807. On x86_64, LLONG_MIN/-1 will cause a kernel exception. On arm64, the result for LLONG_MIN/-1 is LLONG_MIN.

Further investigation found all the following sdiv/smod cases may trigger an exception when bpf program is running on x86_64 platform: - LLONG_MIN/-1 for 64bit operation - INT_MIN/-1 for 32bit operation - LLONG_MIN%-1 for 64bit operation - INT_MIN%-1 for 32bit operation where -1 can be an immediate or in a register.

On arm64, there are no exceptions: - LLONG_MIN/-1 = LLONG_MIN - INT_MIN/-1 = INT_MIN - LLONG_MIN%-1 = 0 - INT_MIN%-1 = 0 where -1 can be an immediate or in a register.

Insn patching is needed to handle the above cases and the patched codes produced results aligned with above arm64 result. The below are pseudo codes to handle sdiv/smod exceptions including both divisor -1 and divisor 0 and the divisor is stored in a register.

sdiv: tmp = rX tmp += 1 /* [-1, 0] -> [0, 1] if tmp >(unsigned) 1 goto L2 if tmp == 0 goto L1 rY = 0 L1: rY = -rY; goto L3 L2: rY /= rX L3:

smod: tmp = rX tmp += 1 /* [-1, 0] -> [0, 1] if tmp >(unsigned) 1 goto L1 if tmp == 1 (is64 ? goto L2 : goto L3) rY = 0; goto L2 L1: rY %= rX L2: goto L4 // only when !is64 L3: wY = wY // only when !is64 L4:

[1] https://lore.kernel.org/bpf/tPJLTEh7S_DxFEqAI2Ji5MBSoZVg7_G-Py2iaZpAaWtM961fFTWtsnlzwvTbzBzaUzwQAoNATXKUlt0LZOFgnDcIyKCswAnAGdUF3LBrhGQ=@protonmail.com/

Patch / fix

  • Linux Linux 6.6.160, 6.10.14, 6.11.3, 6.12
  • linux Debian 14, Debian 13 6.11.4-1

debian advisories DEBIAN-CVE-2024-49888

  • linux Ubuntu 24.04 LTS 6.8.0-54.56
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1023.25
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1024.26
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1019.23
  • linux-ibm Ubuntu 24.04 LTS 6.8.0-1022.22
  • linux-azure Ubuntu 24.04 LTS 6.8.0-1025.30
  • linux-gkeop Ubuntu 24.04 LTS 6.8.0-1006.8
  • linux-raspi Ubuntu 24.04 LTS 6.8.0-1019.23

ubuntu advisories UBUNTU-CVE-2024-49888

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-503.19.1.el9_5
  • rv RHEL 9 5.14.0-503.19.1.el9_5
  • perf RHEL 9 5.14.0-503.19.1.el9_5
  • rtla RHEL 9 5.14.0-503.19.1.el9_5
  • bpftool RHEL 9 7.4.0-503.19.1.el9_5
  • libperf RHEL 9 5.14.0-503.19.1.el9_5
  • kernel-rt RHEL 9 5.14.0-503.19.1.el9_5
  • kernel-64k RHEL 9 5.14.0-503.19.1.el9_5

red hat advisories RHSA-2024:11486RHSA-2024:10942

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-24.1.21.4
  • kernel-livepatch-MICRO-6-0_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.2
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-22.1
  • kernel-livepatch-MICRO-6-0-RT_Update_4 Linux Micro 6.1, Linux Micro 6.0 1-1.1

suse advisories SUSE-SU-2025:20164-1SUSE-SU-2025:20247-1SUSE-SU-2025:20163-1SUSE-SU-2025:20246-1SUSE-SU-2024:4387-1SUSE-SU-2024:4318-1

  • kernel-source-longterm openSUSE Tumbleweed 6.12.11-1.1
  • kernel-source openSUSE Tumbleweed 6.11.8-1.1

opensuse advisories openSUSE-SU-2025:14705-1openSUSE-SU-2024:14500-1

  • kernel AlmaLinux 9 5.14.0-503.19.1.el9_5
  • rv AlmaLinux 9 5.14.0-503.19.1.el9_5
  • perf AlmaLinux 9 5.14.0-503.19.1.el9_5
  • rtla AlmaLinux 9 5.14.0-503.19.1.el9_5
  • bpftool AlmaLinux 9 7.4.0-503.19.1.el9_5
  • libperf AlmaLinux 9 5.14.0-503.19.1.el9_5
  • kernel-rt AlmaLinux 9 5.14.0-503.19.1.el9_5
  • kernel-64k AlmaLinux 9 5.14.0-503.19.1.el9_5

almalinux advisories ALSA-2024:11486

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-49888 updated cvss 4.4

kernel: bpf: Fix a sdiv overflow issue

  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-s390x 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-x86_64 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-aarch64 5.14.0-503.19.1.el9_5, kernel-debuginfo-common-ppc64le 5.14.0-503.19.1.el9_5
    fixed: vendor fix RHSA-2024:11486
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.48.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.48.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.48.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.48.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.48.1.el9_4
    fixed: vendor fix RHSA-2024:10942
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-503.19.1.el9_5, perf 5.14.0-503.19.1.el9_5, rtla 5.14.0-503.19.1.el9_5, kernel-devel-matched 5.14.0-503.19.1.el9_5, kernel-64k-devel-matched 5.14.0-503.19.1.el9_5, kernel-debug-devel-matched 5.14.0-503.19.1.el9_5, +6 more
    fixed: vendor fix RHSA-2024:11486
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.48.1.el9_4, perf 5.14.0-427.48.1.el9_4, rtla 5.14.0-427.48.1.el9_4, kernel-devel-matched 5.14.0-427.48.1.el9_4, kernel-64k-devel-matched 5.14.0-427.48.1.el9_4, kernel-debug-devel-matched 5.14.0-427.48.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:10942
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.4.0-503.19.1.el9_5, kernel 5.14.0-503.19.1.el9_5, kernel-64k 5.14.0-503.19.1.el9_5, kernel-core 5.14.0-503.19.1.el9_5, kernel-tools 5.14.0-503.19.1.el9_5, python3-perf 5.14.0-503.19.1.el9_5, +29 more
    fixed: vendor fix RHSA-2024:11486
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.48.1.el9_4, kernel 5.14.0-427.48.1.el9_4, kernel-64k 5.14.0-427.48.1.el9_4, kernel-core 5.14.0-427.48.1.el9_4, kernel-tools 5.14.0-427.48.1.el9_4, python3-perf 5.14.0-427.48.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:10942
show 5 more
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-503.19.1.el9_5, kernel-rt-core 5.14.0-503.19.1.el9_5, kernel-rt-modules 5.14.0-503.19.1.el9_5, kernel-rt-debug-core 5.14.0-503.19.1.el9_5, kernel-rt-modules-core 5.14.0-503.19.1.el9_5, kernel-rt-debug-modules 5.14.0-503.19.1.el9_5, +4 more
    fixed: vendor fix RHSA-2024:11486
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.48.1.el9_4, kernel-rt-core 5.14.0-427.48.1.el9_4, kernel-rt-modules 5.14.0-427.48.1.el9_4, kernel-rt-debug-core 5.14.0-427.48.1.el9_4, kernel-rt-modules-core 5.14.0-427.48.1.el9_4, kernel-rt-debug-modules 5.14.0-427.48.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:10942
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-503.19.1.el9_5, kernel-rt-kvm 5.14.0-503.19.1.el9_5, kernel-rt-core 5.14.0-503.19.1.el9_5, kernel-rt-modules 5.14.0-503.19.1.el9_5, kernel-rt-debug-kvm 5.14.0-503.19.1.el9_5, kernel-rt-debug-core 5.14.0-503.19.1.el9_5, +6 more
    fixed: vendor fix RHSA-2024:11486
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.48.1.el9_4, kernel-rt-kvm 5.14.0-427.48.1.el9_4, kernel-rt-core 5.14.0-427.48.1.el9_4, kernel-rt-modules 5.14.0-427.48.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.48.1.el9_4, kernel-rt-debug-core 5.14.0-427.48.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:10942
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-doc 5.14.0-427.48.1.el9_4
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.