bpf: Fix use-after-free in offloaded map/prog info fill

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Summary

CVECVE-2026-53089
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 use-after-free in offloaded map/prog info fill When querying info for an offloaded BPF map or program, bpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns() obtain the network namespace with get_net(dev_net(offmap->netdev)). However, the associated netdev's netns may be racing with teardown during netns destruction. If the netns refcount has already reached 0, get_net() performs a refcount_t increment on 0, triggering: refcount_t: addition on 0; use-after-free. Although rtnl_lock and bpf_devs_lock ensure the netdev pointer remains valid, they cannot prevent the netns refcount from reaching zero. Fix this by using maybe_get_net() instead of get_net(). maybe_get_net() uses refcount_inc_not_zero() and returns NULL if the refcount is already zero, which causes ns_get_path_cb() to fail and the caller to return -ENOENT -- the correct behavior when the netns is being destroyed.

Risk And Classification

EPSS: 0.001450000 probability, percentile 0.041030000 (date 2026-06-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 675fc275a3a2d905535207237402c6d8dcb5fa4b a51e7fbe94a87e236631a83973d4f558310b2cd2 git Not specified
CNA Linux Linux affected 675fc275a3a2d905535207237402c6d8dcb5fa4b a0c584fc18056709c8e047a82a6045d6c209f4ce git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 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/a51e7fbe94a87e236631a83973d4f558310b2cd2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0c584fc18056709c8e047a82a6045d6c209f4ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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