Answer in brief
CVE-2026-63858 records a Unknown severity vulnerability in netfilter: nf_tables: add hook transactions for device deletions. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=b6d9014a3335194590abdd2a2471ef5147a67645 <4e69bfb32b2db323d9205fdb30e284481b37817c || >=b6d9014a3335194590abdd2a2471ef5147a67645 <10f79dbd7719d1da9f5884d13060322d8729f091 || 7a248f9c74f9f62799718c12efd9e9e391d60b6f || f275989ad04159dbfc62cefb65ba9c5ba1d7c34f || 62d91062058b42bf70b2c3446aec397bb0ce15ee || 99180dec5ae582227219d1fdd0dd5ccf53ec7491 || >=5.10.122 <5.11 || >=5.15.47 <5.16 || >=5.17.15 <5.18 || >=5.18.4 <5.19 | 4e69bfb32b2db323d9205fdb30e284481b37817c, 10f79dbd7719d1da9f5884d13060322d8729f091, 5.11, 5.16, 5.18, 5.19 |
| Linux/Linuxgeneric | 5.19 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: add hook transactions for device deletions Restore the flag that indicates that the hook is going away, ie. NFT_HOOK_REMOVE, but add a new transaction object to track deletion of hooks without altering the basechain/flowtable hook_list during the preparation phase. The existing approach that moves the hook from the basechain/flowtable hook_list to transaction hook_list breaks netlink dump path readers of this RCU-protected list. It should be possible use an array for nft_trans_hook to store the deleted hooks to compact the representation but I am not expecting many hook object, specially now that wildcard support for devices is in place. Note that the nft_trans_chain_hooks() list contains a list of struct nft_trans_hook objects for DELCHAIN and DELFLOWTABLE commands, while this list stores struct nft_hook objects for NEWCHAIN and NEWFLOWTABLE. Note that new commands can be updated to use nft_trans_hook for consistency. This patch also adapts the event notification path to deal with the list of hook transactions.
Quoted source text, attributed separately from HOL analysis.