CVE-2026-53094 (GCVE-0-2026-53094)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-08-05 12:33
VLAI
Title
bpf: Fix stale offload->prog pointer after constant blinding
Summary
In 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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < a713b72ff88cdab4d5d692908ab1259ada511f4d (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < 25484c39d1ec82a0368798d956da3de5039b3fe8 (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < 059525cf18e69a9313baf947d8898c6ee7ca6b65 (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < c79f8503d83d4665be461fb9e45e215d0380c67b (git)
Affected: 2b3486bc2d237ec345b3942b7be5deabf8c8fed1 , < a1aa9ef47c299c5bbc30594d3c2f0589edf908e6 (git)
Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stale offload-\u003eprog 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 \u003e= 2),\nbpf_jit_blind_constants() clones the program. The original prog is then\nfreed in bpf_jit_prog_release_other(), which updates aux-\u003eprog to point\nto the surviving clone, but fails to update offload-\u003eprog.\n\nThis leaves offload-\u003eprog pointing to the freed original program. When\nthe network namespace is subsequently destroyed, cleanup_net() triggers\nbpf_dev_bound_netdev_unregister(), which iterates ondev-\u003eprogs and calls\n__bpf_prog_offload_destroy(offload-\u003eprog). 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 \u003e /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 -\u003e 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\u0027s prog clone-and-replace,\nwhile also having offload-\u003eprog that must stay in sync.\n\nFix this by updating offload-\u003eprog in bpf_jit_prog_release_other(),\nalongside the existing aux-\u003eprog update. Both are back-pointers to\nthe prog that must be kept in sync when the prog is replaced."
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              "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-\u003eprog` 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-\u003eaux` 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."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53094",
    "datePublished": "2026-06-24T16:30:32.815Z",
    "dateReserved": "2026-06-09T07:44:35.384Z",
    "dateUpdated": "2026-08-05T12:33:20.910Z",
    "state": "PUBLISHED"
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      "title": "bpf: Fix stale offload-\u003eprog pointer after constant blinding",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53094.json",
      "version": "2"
    },
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When\\nthe network namespace is subsequently destroyed, cleanup_net() triggers\\nbpf_dev_bound_netdev_unregister(), which iterates ondev-\u003eprogs and calls\\n__bpf_prog_offload_destroy(offload-\u003eprog). 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 \u003e /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 -\u003e 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\u0027s prog clone-and-replace,\\nwhile also having offload-\u003eprog that must stay in sync.\\n\\nFix this by updating offload-\u003eprog in bpf_jit_prog_release_other(),\\nalongside the existing aux-\u003eprog update. Both are back-pointers to\\nthe prog that must be kept in sync when the prog is replaced.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2b3486bc2d237ec345b3942b7be5deabf8c8fed1\",\"lessThan\":\"a713b72ff88cdab4d5d692908ab1259ada511f4d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2b3486bc2d237ec345b3942b7be5deabf8c8fed1\",\"lessThan\":\"25484c39d1ec82a0368798d956da3de5039b3fe8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2b3486bc2d237ec345b3942b7be5deabf8c8fed1\",\"lessThan\":\"059525cf18e69a9313baf947d8898c6ee7ca6b65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2b3486bc2d237ec345b3942b7be5deabf8c8fed1\",\"lessThan\":\"c79f8503d83d4665be461fb9e45e215d0380c67b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2b3486bc2d237ec345b3942b7be5deabf8c8fed1\",\"lessThan\":\"a1aa9ef47c299c5bbc30594d3c2f0589edf908e6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.141\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.3\",\"versionEndExcluding\":\"6.6.141\",\"matchCriteriaId\":\"681DADD7-FC7E-47E6-AC5C-0E445F6F3E42\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.91\",\"matchCriteriaId\":\"C918746B-DE6F-448F-A93E-A04C5481688D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.33\",\"matchCriteriaId\":\"96D99E49-380D-43AB-BDBA-25C3AD018A9C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.10\",\"matchCriteriaId\":\"A13475D2-59BF-4716-94B5-7C1D239A2CF4\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/059525cf18e69a9313baf947d8898c6ee7ca6b65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/25484c39d1ec82a0368798d956da3de5039b3fe8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a1aa9ef47c299c5bbc30594d3c2f0589edf908e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a713b72ff88cdab4d5d692908ab1259ada511f4d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c79f8503d83d4665be461fb9e45e215d0380c67b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-07T08:50:32+00:00",
      "cve": "CVE-2026-53094",
      "id": "CVE-2026-53094",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix stale offload-\u003eprog pointer after constant blinding",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53094.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-03T03:05:21Z",
      "cve": "CVE-2026-53094",
      "id": "CVE-2026-53094",
      "initial_release_date": "2026-07-03T03:05:21Z",
      "product_status:known_affected": "285",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53094",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53094.json",
      "version": "2"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.