High 7.8Published Jun 24, 2026

CVE-2026-53089bpf: Fix use-after-free in offloaded map/prog info fill

Updated under an hour ago (Oct 28, 2026, 2:10 PM ET)

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Exploited in the last 30 days

In 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.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Sep 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	675fc275a3a2d905535207237402c6d8dcb5fa4b builds before 43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d; from 675fc275a3a2d905535207237402c6d8dcb5fa4b before 642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e; from 675fc275a3a2d905535207237402c6d8dcb5fa4b before fea55b034328feaafef75aee252f305e6f85a991; from 675fc275a3a2d905535207237402c6d8dcb5fa4b before 5662dac41a3442aa378d7c405164903eb109fc05; 675fc275a3a2d905535207237402c6d8dcb5fa4b builds before 1a2dc103e16448d022a77ad5fc3234641436c4b7; 675fc275a3a2d905535207237402c6d8dcb5fa4b builds before 85dc711f742b192eb97c0e00b521312f5a7a415e; from 675fc275a3a2d905535207237402c6d8dcb5fa4b before a51e7fbe94a87e236631a83973d4f558310b2cd2; from 675fc275a3a2d905535207237402c6d8dcb5fa4b before a0c584fc18056709c8e047a82a6045d6c209f4ce	CNA record
linux linux_kernel linux:linux_kernel	from 4.16 before 7.0.10	NVD

References

References

https://git.kernel.org/stable/c/43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d
https://git.kernel.org/stable/c/642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e
https://git.kernel.org/stable/c/fea55b034328feaafef75aee252f305e6f85a991
https://git.kernel.org/stable/c/5662dac41a3442aa378d7c405164903eb109fc05
https://git.kernel.org/stable/c/1a2dc103e16448d022a77ad5fc3234641436c4b7
https://git.kernel.org/stable/c/85dc711f742b192eb97c0e00b521312f5a7a415e
https://git.kernel.org/stable/c/a51e7fbe94a87e236631a83973d4f558310b2cd2	patch
https://git.kernel.org/stable/c/a0c584fc18056709c8e047a82a6045d6c209f4ce	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.