bpf: Fix abuse of kprobe_write_ctx via freplace

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Summary

CVECVE-2026-53095
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:23 UTC
Updated2026-06-24 17:17:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix abuse of kprobe_write_ctx via freplace uprobe programs are allowed to modify struct pt_regs. Since the actual program type of uprobe is KPROBE, it can be abused to modify struct pt_regs via kprobe+freplace when the kprobe attaches to kernel functions. For example, SEC("?kprobe") int kprobe(struct pt_regs *regs) { return 0; } SEC("?freplace") int freplace_kprobe(struct pt_regs *regs) { regs->di = 0; return 0; } freplace_kprobe prog will attach to kprobe prog. kprobe prog will attach to a kernel function. Without this patch, when the kernel function runs, its first arg will always be set as 0 via the freplace_kprobe prog. To fix the abuse of kprobe_write_ctx=true via kprobe+freplace, disallow attaching freplace programs on kprobe programs with different kprobe_write_ctx values.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.061690000 (date 2026-06-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7384893d970ea114952aef54ad7e3d7d2ca82d4f b312cf41b9e43f442613053f6cad39898e1baf96 git Not specified
CNA Linux Linux affected 7384893d970ea114952aef54ad7e3d7d2ca82d4f 9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8 git Not specified
CNA Linux Linux affected 7384893d970ea114952aef54ad7e3d7d2ca82d4f 611fe4b79af72d00d80f2223354284447daafae9 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b312cf41b9e43f442613053f6cad39898e1baf96 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/611fe4b79af72d00d80f2223354284447daafae9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9836cadbd96c7e0dbb0018fa60e7872dd31ac4f8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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