{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53094", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.384Z", "datePublished": "2026-06-24T16:30:32.815Z", "dateUpdated": "2026-08-05T12:33:20.910Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:20.910Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stale offload->prog pointer after constant blinding\n\nWhen a dev-bound-only BPF program (BPF_F_XDP_DEV_BOUND_ONLY) undergoes\nJIT compilation with constant blinding enabled (bpf_jit_harden >= 2),\nbpf_jit_blind_constants() clones the program. The original prog is then\nfreed in bpf_jit_prog_release_other(), which updates aux->prog to point\nto the surviving clone, but fails to update offload->prog.\n\nThis leaves offload->prog pointing to the freed original program. When\nthe network namespace is subsequently destroyed, cleanup_net() triggers\nbpf_dev_bound_netdev_unregister(), which iterates ondev->progs and calls\n__bpf_prog_offload_destroy(offload->prog). Accessing the freed prog\ncauses a page fault:\n\nBUG: unable to handle page fault for address: ffffc900085f1038\nWorkqueue: netns cleanup_net\nRIP: 0010:__bpf_prog_offload_destroy+0xc/0x80\nCall Trace:\n__bpf_offload_dev_netdev_unregister+0x257/0x350\nbpf_dev_bound_netdev_unregister+0x4a/0x90\nunregister_netdevice_many_notify+0x2a2/0x660\n...\ncleanup_net+0x21a/0x320\n\nThe test sequence that triggers this reliably is:\n\n1. Set net.core.bpf_jit_harden=2 (echo 2 > /proc/sys/net/core/bpf_jit_harden)\n2. Run xdp_metadata selftest, which creates a dev-bound-only XDP\n program on a veth inside a netns (./test_progs -t xdp_metadata)\n3. cleanup_net -> page fault in __bpf_prog_offload_destroy\n\nDev-bound-only programs are unique in that they have an offload structure\nbut go through the normal JIT path instead of bpf_prog_offload_compile().\nThis means they are subject to constant blinding's prog clone-and-replace,\nwhile also having offload->prog that must stay in sync.\n\nFix this by updating offload->prog in bpf_jit_prog_release_other(),\nalongside the existing aux->prog update. Both are back-pointers to\nthe prog that must be kept in sync when the prog is replaced." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is reached through local `bpf(BPF_PROG_LOAD)` and netlink/netns operations used to create and tear down a device-bound XDP program, not by remote packets.\nAC:L - Once the target has BPF JIT hardening set to blind constants for all users, the trigger is deterministic: load a dev-bound-only XDP program with constants, then unregister the device or destroy the netns. There is no attacker-uncontrolled race to win.\nPR:L - XDP program loading requires BPF and NET_ADMIN privileges, but these can be available in user-namespace/container deployments through BPF token delegation and namespaced capabilities. Under the required rule, this is scored as Low rather than High.\nUI:N - No victim action is required after the attacker has local execution; the attacker can perform the BPF load and netdevice/netns teardown directly.\nS:U - The bug corrupts/dereferences kernel memory within the same kernel security authority. This is standard local kernel compromise/DoS rather than a VM or hardware isolation boundary escape.\nC:H - The stale `offload->prog` is a use-after-free of a `struct bpf_prog`; if reclaimed, the cleanup path trusts attacker-shaped pointers and can be developed into kernel memory disclosure primitives. Kernel UAFs are scored High for confidentiality.\nI:H - The same UAF can drive trusted list/free/write operations through forged `prog->aux` and `offload` pointers, making arbitrary kernel memory corruption or code execution plausible. Kernel UAFs are scored High for integrity.\nA:H - The upstream report shows a reliable kernel page fault during `cleanup_net()`/netdevice unregister when the stale pointer is dereferenced. This is a kernel crash availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/core.c" ], "versions": [ { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "a713b72ff88cdab4d5d692908ab1259ada511f4d", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "25484c39d1ec82a0368798d956da3de5039b3fe8", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "059525cf18e69a9313baf947d8898c6ee7ca6b65", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "c79f8503d83d4665be461fb9e45e215d0380c67b", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "a1aa9ef47c299c5bbc30594d3c2f0589edf908e6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/core.c" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a713b72ff88cdab4d5d692908ab1259ada511f4d" }, { "url": "https://git.kernel.org/stable/c/25484c39d1ec82a0368798d956da3de5039b3fe8" }, { "url": "https://git.kernel.org/stable/c/059525cf18e69a9313baf947d8898c6ee7ca6b65" }, { "url": "https://git.kernel.org/stable/c/c79f8503d83d4665be461fb9e45e215d0380c67b" }, { "url": "https://git.kernel.org/stable/c/a1aa9ef47c299c5bbc30594d3c2f0589edf908e6" } ], "title": "bpf: Fix stale offload->prog pointer after constant blinding", "x_generator": { "engine": "bippy-1.2.0" } } } }