CVE-2026-43238None▾ SunlitIn 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 suppor…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 38a6f0865796e26fc38fff4858f681d9ae76fa0f < 59809fda4da7730cfe84a948033f47eb45db073dLinux >= 38a6f0865796e26fc38fff4858f681d9ae76fa0f < 9c735a7d98c982a786b0db71eb6566ee00aaa04fLinux >= 38a6f0865796e26fc38fff4858f681d9ae76fa0f < 015cebdfcb97b5347fb7f598ea712a281cb35840Linux >= 38a6f0865796e26fc38fff4858f681d9ae76fa0f < 4ece5eb4836f8ff03b9004dc2430a7169f282851Linux >= 38a6f0865796e26fc38fff4858f681d9ae76fa0f < 3c2b95b26860bd6f8e2310d31ea1200d3f8f173eLinux >= 38a6f0865796e26fc38fff4858f681d9ae76fa0f < be054cc66f739a9ba615dba9012a07fab8e7dd6fLinux 5.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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