{"id":"CVE-2026-53089","title":"bpf: Fix use-after-free in offloaded map/prog info fill","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free in offloaded map/prog info fill\n\nWhen querying info for an offloaded BPF map or program,\nbpf_map_offload_info_fill_ns() and bpf_prog_offload_inf…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d","Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e","Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < fea55b034328feaafef75aee252f305e6f85a991","Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 5662dac41a3442aa378d7c405164903eb109fc05","Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 1a2dc103e16448d022a77ad5fc3234641436c4b7","Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 85dc711f742b192eb97c0e00b521312f5a7a415e","Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < a51e7fbe94a87e236631a83973d4f558310b2cd2","Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < a0c584fc18056709c8e047a82a6045d6c209f4ce","Linux 4.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:18:12.065771Z"},"published":"2026-06-24","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:23:59.016Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53089","references":[{"url":"https://git.kernel.org/stable/c/43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d"},{"url":"https://git.kernel.org/stable/c/642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e"},{"url":"https://git.kernel.org/stable/c/fea55b034328feaafef75aee252f305e6f85a991"},{"url":"https://git.kernel.org/stable/c/5662dac41a3442aa378d7c405164903eb109fc05"},{"url":"https://git.kernel.org/stable/c/1a2dc103e16448d022a77ad5fc3234641436c4b7"},{"url":"https://git.kernel.org/stable/c/85dc711f742b192eb97c0e00b521312f5a7a415e"},{"url":"https://git.kernel.org/stable/c/a51e7fbe94a87e236631a83973d4f558310b2cd2"},{"url":"https://git.kernel.org/stable/c/a0c584fc18056709c8e047a82a6045d6c209f4ce"}],"tags":["cve.org"],"epss":0.00117,"epssPercentile":0.01669,"ingestedAt":"2026-11-06T16:57:43.296Z","slug":"CVE-2026-53089","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free in offloaded map/prog info fill\n\nWhen querying info for an offloaded BPF map or program,\nbpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns()\nobtain the network namespace with get_net(dev_net(offmap->netdev)).\nHowever, the associated netdev's netns may be racing with teardown\nduring netns destruction. If the netns refcount has already reached 0,\nget_net() performs a refcount_t increment on 0, triggering:\n\n  refcount_t: addition on 0; use-after-free.\n\nAlthough rtnl_lock and bpf_devs_lock ensure the netdev pointer remains\nvalid, they cannot prevent the netns refcount from reaching zero.\n\nFix this by using maybe_get_net() instead of get_net(). maybe_get_net()\nuses refcount_inc_not_zero() and returns NULL if the refcount is already\nzero, which causes ns_get_path_cb() to fail and the caller to return\n-ENOENT -- the correct behavior when the netns is being destroyed.\n\n## Affected\n\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d`\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e`\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < fea55b034328feaafef75aee252f305e6f85a991`\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 5662dac41a3442aa378d7c405164903eb109fc05`\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 1a2dc103e16448d022a77ad5fc3234641436c4b7`\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 85dc711f742b192eb97c0e00b521312f5a7a415e`\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < a51e7fbe94a87e236631a83973d4f558310b2cd2`\n- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < a0c584fc18056709c8e047a82a6045d6c209f4ce`\n- `Linux 4.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}