CVE-2026-98042

CVE CVE-2026-98042EUVD EUVD-2026-86695Published 2026-09-25T10:23:54.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Don't resurrect a scalar id dropped by collect_linked_regs() check_cond_jmp_op() copies the compared registers into env->{false,true}_reg{1,2} before collect_linked_regs() runs and copies those snapshots back into both branch states afterwards. collect_linked_regs() records at most LINKED_REGS_MAX members of a linked registers group in the jump history and calls clear_scalar_id() for every member that does not fit. The compared register is not exempt from that. As a consequence, sync_linked_regs() might adjust ranges for more registers than bpf_bt_sync_linked_regs() can propagate precision to. Collect the linked registers before the snapshots are taken instead. This might lead to some unnecessary clear_scalar_id's, but from previous testing situations with many linked registers are extremely rare.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 0; 7.1; ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 <e821ff19b8ef08255ff8d8234774ed814637e9bf; patch: 7.3-rc2; patch: 7.2.7; ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 <73a98f96811e2cb0f4210b1caa8cb322f92f2a2b

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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