CVE-2026-53069
net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master
Description
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.
INFO
Published Date :
June 24, 2026, 5:17 p.m.
Last Modified :
July 21, 2026, 5:39 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to include the fix.
- Verify master devices are in the UP state.
- Avoid attaching XDP to master devices before they are fully initialized.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53069.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53069 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53069
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53069 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53069 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added CWE CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.141 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15 up to (excluding) 5.15.209 Added Reference Type kernel.org: https://git.kernel.org/stable/c/183128da0406b1c10e6f60b7b9fe70788b9c8c1d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1921f91298d1388a0bb9db8f83800c998b649cb3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3128b294b426533c8d9162187446d93a8a160359 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7bad93e99737e4a5c0c14ac50c05152cf4e28022 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/866d3d9b87751b1944168fd82615505e0c0fd6cf Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/acbf45bd584d924b320bee2a7fe2a26f64904d95 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ea690b3b6e58ae00979af8195b4cc24df466b65e Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', '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'}], 'programFiles': ['net/core/filter.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.15', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/core/filter.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/183128da0406b1c10e6f60b7b9fe70788b9c8c1d Added Reference https://git.kernel.org/stable/c/1921f91298d1388a0bb9db8f83800c998b649cb3 Added Reference https://git.kernel.org/stable/c/3128b294b426533c8d9162187446d93a8a160359 Added Reference https://git.kernel.org/stable/c/7bad93e99737e4a5c0c14ac50c05152cf4e28022 Added Reference https://git.kernel.org/stable/c/866d3d9b87751b1944168fd82615505e0c0fd6cf Added Reference https://git.kernel.org/stable/c/acbf45bd584d924b320bee2a7fe2a26f64904d95 Added Reference https://git.kernel.org/stable/c/ea690b3b6e58ae00979af8195b4cc24df466b65e