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HIGH

CVE-2023-35788

CVSS v3

7.8

HIGH

EPSS Score

0.5 %

exploit probability, as of 2026-10-15

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • bpftoolAlmaLinux:9all versions · fixed in 7.0.0-284.25.1.el9_2
  • kernelAlmaLinux:9all versions · fixed in 5.14.0-284.25.1.el9_2and 45 other packages
  • kernelAlmaLinux:8all versions · fixed in 4.18.0-477.27.2.el8_8and 24 other packages
  • kernel-rtAlmaLinux:9all versions · fixed in 5.14.0-284.25.1.rt14.310.el9_2and 13 other packages

Vendor advisories

  • CVE-2023-35788 Red Hat Product Security1,638 products fixed

    kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()

  • ICSA-24-165-06 CISA2 known affected

    Siemens TIM 1531 IRC

    SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) · TIM 1531 IRC (6GK7543-1MX00-0XE0)

  • SSA-337522 Siemens ProductCERT2 known affected

    SSA-337522: Multiple Vulnerabilities in TIM 1531 IRC before V2.4.8

    SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) · TIM 1531 IRC (6GK7543-1MX00-0XE0)

  • ICSA-24-046-11 CISA11 known affected

    Siemens SCALANCE XCM-/XRM-300

    SCALANCE XCH328 (6GK5328-4TS01-2EC2) · SCALANCE XCM324 (6GK5324-8TS01-2AC2) · SCALANCE XCM328 (6GK5328-4TS01-2AC2)

  • SSA-806742 Siemens ProductCERT11 known affected

    SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4

    SCALANCE XCH328 (6GK5328-4TS01-2EC2) · SCALANCE XCM324 (6GK5324-8TS01-2AC2) · SCALANCE XCM328 (6GK5328-4TS01-2AC2)

  • ICSA-23-320-13 CISA1 known affected

    Siemens SIMATIC MV500

    SIMATIC MV500 family

25 more advisories

Full record on NVD

Description

An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7. It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets. This may result in denial of service or privilege escalation.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2023-06-16
Last Modified
2026-09-18

Frequently asked questions

What is CVE-2023-35788?

An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7. It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets. This may result in denial of service or privilege escalation.

Is CVE-2023-35788 actively exploited?

Active exploitation of CVE-2023-35788 has not been confirmed. Its EPSS score was 0.5% on 2026-10-15, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-35788?

CVE-2023-35788 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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