bpf: Fix stale offload->prog pointer after constant blinding

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Summary

CVECVE-2026-53094
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 stale offload->prog pointer after constant blinding When a dev-bound-only BPF program (BPF_F_XDP_DEV_BOUND_ONLY) undergoes JIT compilation with constant blinding enabled (bpf_jit_harden >= 2), bpf_jit_blind_constants() clones the program. The original prog is then freed in bpf_jit_prog_release_other(), which updates aux->prog to point to the surviving clone, but fails to update offload->prog. This leaves offload->prog pointing to the freed original program. When the network namespace is subsequently destroyed, cleanup_net() triggers bpf_dev_bound_netdev_unregister(), which iterates ondev->progs and calls __bpf_prog_offload_destroy(offload->prog). Accessing the freed prog causes a page fault: BUG: unable to handle page fault for address: ffffc900085f1038 Workqueue: netns cleanup_net RIP: 0010:__bpf_prog_offload_destroy+0xc/0x80 Call Trace: __bpf_offload_dev_netdev_unregister+0x257/0x350 bpf_dev_bound_netdev_unregister+0x4a/0x90 unregister_netdevice_many_notify+0x2a2/0x660 ... cleanup_net+0x21a/0x320 The test sequence that triggers this reliably is: 1. Set net.core.bpf_jit_harden=2 (echo 2 > /proc/sys/net/core/bpf_jit_harden) 2. Run xdp_metadata selftest, which creates a dev-bound-only XDP program on a veth inside a netns (./test_progs -t xdp_metadata) 3. cleanup_net -> page fault in __bpf_prog_offload_destroy Dev-bound-only programs are unique in that they have an offload structure but go through the normal JIT path instead of bpf_prog_offload_compile(). This means they are subject to constant blinding's prog clone-and-replace, while also having offload->prog that must stay in sync. Fix this by updating offload->prog in bpf_jit_prog_release_other(), alongside the existing aux->prog update. Both are back-pointers to the prog that must be kept in sync when the prog is replaced.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063480000 (date 2026-06-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 a713b72ff88cdab4d5d692908ab1259ada511f4d git Not specified
CNA Linux Linux affected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 25484c39d1ec82a0368798d956da3de5039b3fe8 git Not specified
CNA Linux Linux affected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 059525cf18e69a9313baf947d8898c6ee7ca6b65 git Not specified
CNA Linux Linux affected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 c79f8503d83d4665be461fb9e45e215d0380c67b git Not specified
CNA Linux Linux affected 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 a1aa9ef47c299c5bbc30594d3c2f0589edf908e6 git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* 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/059525cf18e69a9313baf947d8898c6ee7ca6b65 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/25484c39d1ec82a0368798d956da3de5039b3fe8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a713b72ff88cdab4d5d692908ab1259ada511f4d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1aa9ef47c299c5bbc30594d3c2f0589edf908e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c79f8503d83d4665be461fb9e45e215d0380c67b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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