CVE-2026-53069 (GCVE-0-2026-53069)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-28 06:38
VLAI
Title
net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master
Summary
In the Linux kernel, the following vulnerability has been resolved: net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master syzkaller reported a kernel panic in bond_rr_gen_slave_id() reached via xdp_master_redirect(). Full decoded trace: https://syzkaller.appspot.com/bug?extid=80e046b8da2820b6ba73 bond_rr_gen_slave_id() dereferences bond->rr_tx_counter, a per-CPU counter that bonding only allocates in bond_open() when the mode is round-robin. If the bond device was never brought up, rr_tx_counter stays NULL. The XDP redirect path can still reach that code on a bond that was never opened: bpf_master_redirect_enabled_key is a global static key, so as soon as any bond device has native XDP attached, the XDP_TX -> xdp_master_redirect() interception is enabled for every slave system-wide. The path xdp_master_redirect() -> bond_xdp_get_xmit_slave() -> bond_xdp_xmit_roundrobin_slave_get() -> bond_rr_gen_slave_id() then runs against a bond that has no rr_tx_counter and crashes. Fix this in the generic xdp_master_redirect() by refusing to call into the master's ->ndo_xdp_get_xmit_slave() when the master device is not up. IFF_UP is only set after ->ndo_open() has successfully returned, so this reliably excludes masters whose XDP state has not been fully initialized. Drop the frame with XDP_ABORTED so the exception is visible via trace_xdp_exception() rather than silently falling through. This is not specific to bonding: any current or future master that defers XDP state allocation to ->ndo_open() is protected.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 , < 3128b294b426533c8d9162187446d93a8a160359 (git)
Affected: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 , < acbf45bd584d924b320bee2a7fe2a26f64904d95 (git)
Affected: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 , < 866d3d9b87751b1944168fd82615505e0c0fd6cf (git)
Affected: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 , < 183128da0406b1c10e6f60b7b9fe70788b9c8c1d (git)
Affected: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 , < 7bad93e99737e4a5c0c14ac50c05152cf4e28022 (git)
Affected: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 , < ea690b3b6e58ae00979af8195b4cc24df466b65e (git)
Affected: 879af96ffd72706c6e3278ea6b45b0b0e37ec5d7 , < 1921f91298d1388a0bb9db8f83800c998b649cb3 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (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.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, bpf: fix null-ptr-deref in xdp_master_redirect() for down master\n\nsyzkaller reported a kernel panic in bond_rr_gen_slave_id() reached via\nxdp_master_redirect(). Full decoded trace:\n\n  https://syzkaller.appspot.com/bug?extid=80e046b8da2820b6ba73\n\nbond_rr_gen_slave_id() dereferences bond-\u003err_tx_counter, a per-CPU\ncounter that bonding only allocates in bond_open() when the mode is\nround-robin. If the bond device was never brought up, rr_tx_counter\nstays NULL.\n\nThe XDP redirect path can still reach that code on a bond that was\nnever opened: bpf_master_redirect_enabled_key is a global static key,\nso as soon as any bond device has native XDP attached, the\nXDP_TX -\u003e xdp_master_redirect() interception is enabled for every\nslave system-wide. The path xdp_master_redirect() -\u003e\nbond_xdp_get_xmit_slave() -\u003e bond_xdp_xmit_roundrobin_slave_get() -\u003e\nbond_rr_gen_slave_id() then runs against a bond that has no\nrr_tx_counter and crashes.\n\nFix this in the generic xdp_master_redirect() by refusing to call into\nthe master\u0027s -\u003endo_xdp_get_xmit_slave() when the master device is not\nup. IFF_UP is only set after -\u003endo_open() has successfully returned,\nso this reliably excludes masters whose XDP state has not been fully\ninitialized. Drop the frame with XDP_ABORTED so the exception is\nvisible via trace_xdp_exception() rather than silently falling through.\nThis is not specific to bonding: any current or future master that\ndefers XDP state allocation to -\u003endo_open() is protected."
        }
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            "version": "3.1"
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "datePublished": "2026-06-24T16:30:10.930Z",
    "dateReserved": "2026-06-09T07:44:35.382Z",
    "dateUpdated": "2026-06-28T06:38:53.474Z",
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If the bond device was never brought up, rr_tx_counter\\nstays NULL.\\n\\nThe XDP redirect path can still reach that code on a bond that was\\nnever opened: bpf_master_redirect_enabled_key is a global static key,\\nso as soon as any bond device has native XDP attached, the\\nXDP_TX -\u003e xdp_master_redirect() interception is enabled for every\\nslave system-wide. The path xdp_master_redirect() -\u003e\\nbond_xdp_get_xmit_slave() -\u003e bond_xdp_xmit_roundrobin_slave_get() -\u003e\\nbond_rr_gen_slave_id() then runs against a bond that has no\\nrr_tx_counter and crashes.\\n\\nFix this in the generic xdp_master_redirect() by refusing to call into\\nthe master\u0027s -\u003endo_xdp_get_xmit_slave() when the master device is not\\nup. IFF_UP is only set after -\u003endo_open() has successfully returned,\\nso this reliably excludes masters whose XDP state has not been fully\\ninitialized. Drop the frame with XDP_ABORTED so the exception is\\nvisible via trace_xdp_exception() rather than silently falling through.\\nThis is not specific to bonding: any current or future master that\\ndefers XDP state allocation to -\u003endo_open() is protected.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/filter.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\"lessThan\":\"3128b294b426533c8d9162187446d93a8a160359\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\"lessThan\":\"acbf45bd584d924b320bee2a7fe2a26f64904d95\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\"lessThan\":\"866d3d9b87751b1944168fd82615505e0c0fd6cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\"lessThan\":\"183128da0406b1c10e6f60b7b9fe70788b9c8c1d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\"lessThan\":\"7bad93e99737e4a5c0c14ac50c05152cf4e28022\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\"lessThan\":\"ea690b3b6e58ae00979af8195b4cc24df466b65e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"879af96ffd72706c6e3278ea6b45b0b0e37ec5d7\",\"lessThan\":\"1921f91298d1388a0bb9db8f83800c998b649cb3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/filter.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/183128da0406b1c10e6f60b7b9fe70788b9c8c1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1921f91298d1388a0bb9db8f83800c998b649cb3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3128b294b426533c8d9162187446d93a8a160359\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7bad93e99737e4a5c0c14ac50c05152cf4e28022\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/866d3d9b87751b1944168fd82615505e0c0fd6cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/acbf45bd584d924b320bee2a7fe2a26f64904d95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea690b3b6e58ae00979af8195b4cc24df466b65e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.


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