bpf: Don't resurrect a scalar id dropped by collect_linked_regs()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98042
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:32 UTC
Updated2026-09-25 11:17:32 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 e821ff19b8ef08255ff8d8234774ed814637e9bf git Not specified
CNA Linux Linux affected ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 73a98f96811e2cb0f4210b1caa8cb322f92f2a2b git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e821ff19b8ef08255ff8d8234774ed814637e9bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/73a98f96811e2cb0f4210b1caa8cb322f92f2a2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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