CVE-2026-43238 (GCVE-0-2026-43238)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-11 22:20
VLAI
Title
net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash() Commit 38a6f0865796 ("net: sched: support hash selecting tx queue") added SKBEDIT_F_TXQ_SKBHASH support. The inclusive range size is computed as: mapping_mod = queue_mapping_max - queue_mapping + 1; The range size can be 65536 when the requested range covers all possible u16 queue IDs (e.g. queue_mapping=0 and queue_mapping_max=U16_MAX). That value cannot be represented in a u16 and previously wrapped to 0, so tcf_skbedit_hash() could trigger a divide-by-zero: queue_mapping += skb_get_hash(skb) % params->mapping_mod; Compute mapping_mod in a wider type and reject ranges larger than U16_MAX to prevent params->mapping_mod from becoming 0 and avoid the crash.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 38a6f0865796e26fc38fff4858f681d9ae76fa0f , < 59809fda4da7730cfe84a948033f47eb45db073d (git)
Affected: 38a6f0865796e26fc38fff4858f681d9ae76fa0f , < 9c735a7d98c982a786b0db71eb6566ee00aaa04f (git)
Affected: 38a6f0865796e26fc38fff4858f681d9ae76fa0f , < 015cebdfcb97b5347fb7f598ea712a281cb35840 (git)
Affected: 38a6f0865796e26fc38fff4858f681d9ae76fa0f , < 4ece5eb4836f8ff03b9004dc2430a7169f282851 (git)
Affected: 38a6f0865796e26fc38fff4858f681d9ae76fa0f , < 3c2b95b26860bd6f8e2310d31ea1200d3f8f173e (git)
Affected: 38a6f0865796e26fc38fff4858f681d9ae76fa0f , < be054cc66f739a9ba615dba9012a07fab8e7dd6f (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43238.json",
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}



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