CVE-2026-31421None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: net/sched: cls_fw: fix NULL pointer dereference on shared blocks The old-method path in fw_classify() calls tcf_block_q() and dereferences q->handle. Shared blocks le…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
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: cls_fw: fix NULL pointer dereference on shared blocks
The old-method path in fw_classify() calls tcf_block_q() and dereferences q->handle. Shared blocks leave block->q NULL, causing a NULL deref when an empty cls_fw filter is attached to a shared block and a packet with a nonzero major skb mark is classified.
Reject the configuration in fw_change() when the old method (no TCA_OPTIONS) is used on a shared block, since fw_classify()'s old-method path needs block->q which is NULL for shared blocks.
The fixed null-ptr-deref calling stack: KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] RIP: 0010:fw_classify (net/sched/cls_fw.c:81) Call Trace: tcf_classify (./include/net/tc_wrapper.h:197 net/sched/cls_api.c:1764 net/sched/cls_api.c:1860) tc_run (net/core/dev.c:4401) __dev_queue_xmit (net/core/dev.c:4535 net/core/dev.c:4790)
Linux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < d6d5bd62a09650856e1e2010eb09853eba0d64e1Linux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < febf64ca79a2d6540ab6e5e197fa0f4f7e84473eLinux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < 3d41f9a314afa94b1c7c7c75405920123220e8cdLinux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < 18328eff2f97d1a6adcdb6d4a0f42f2f83a31e28Linux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < 5cf41031922c154aa5ccda8bcdb0f5e6226582ecLinux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < 3cb055df9e8625ce699a259d8178d67b37f2b160Linux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < 96426c348def662b06bfdc65be3002905604927aLinux >= 1abf272022cf1d18469405f47b4ec49c6a3125db < faeea8bbf6e958bf3c00cb08263109661975987cLinux 4.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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