UBUNTU-CVE-2025-21980
In the Linux kernel, the following vulnerability has been resolved: sched: address a potential NULL pointer dereference in the GRED scheduler. If kzalloc in gred_init returns a NULL pointer, the code follows the error handling path, invoking gred_destroy. This, in turn, calls gred_offload, where memset could receive a NULL pointer as input, potentially leading to a kernel crash. When table->opt is NULL in gred_init(), gred_change_table_def() is not called yet, so it is not necessary to call ->ndo_setup_tc() in gred_offload().
02 / AFFECTED SOFTWARE
Affected packages
29 explicit affected versions
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1 explicit affected versions
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24 explicit affected versions
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29 explicit affected versions
13 explicit affected versions
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6 explicit affected versions
5 explicit affected versions
13 explicit affected versions
7 explicit affected versions
6 explicit affected versions
10 explicit affected versions
14 explicit affected versions
18 explicit affected versions
3 explicit affected versions
16 explicit affected versions
1 explicit affected versions
43 explicit affected versions
30 explicit affected versions
11 explicit affected versions
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23 explicit affected versions
35 explicit affected versions
12 explicit affected versions
13 explicit affected versions
28 explicit affected versions
4 explicit affected versions
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12 explicit affected versions
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26 explicit affected versions
11 explicit affected versions
12 explicit affected versions
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27 explicit affected versions
12 explicit affected versions
7 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: sched: address a potential NULL pointer dereference in the GRED scheduler. If kzalloc in gred_init returns a NULL pointer, the code follows the error handling path, invoking gred_destroy. This, in turn, calls gred_offload, where memset could receive a NULL pointer as input, potentially leading to a kernel crash. When table->opt is NULL in gred_init(), gred_change_table_def() is not called yet, so it is not necessary to call ->ndo_setup_tc() in gred_offload().
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/115ef44a98220fddfab37a39a19370497cd718b9
- https://git.kernel.org/stable/c/0f0a152957d64ce45b4c27c687e7d087e8f45079
- https://git.kernel.org/stable/c/115ef44a98220fddfab37a39a19370497cd718b9
- https://git.kernel.org/stable/c/5f996b4f80c2cef1f9c77275055e7fcba44c9199
- https://git.kernel.org/stable/c/68896dd50180b38ea552e49a6a00b685321e5769
- https://git.kernel.org/stable/c/d02c9acd68950a444acda18d514e2b41f846cb7f
- https://ubuntu.com/security/CVE-2025-21980
- https://ubuntu.com/security/notices/USN-7605-1
- https://ubuntu.com/security/notices/USN-7605-2
- https://ubuntu.com/security/notices/USN-7606-1
- https://ubuntu.com/security/notices/USN-7628-1
- https://ubuntu.com/security/notices/USN-7764-1
- https://ubuntu.com/security/notices/USN-7764-2
- https://ubuntu.com/security/notices/USN-7765-1
- https://ubuntu.com/security/notices/USN-7766-1
- https://ubuntu.com/security/notices/USN-7767-1
- https://ubuntu.com/security/notices/USN-7767-2
- https://ubuntu.com/security/notices/USN-7779-1
- https://ubuntu.com/security/notices/USN-7790-1
- https://ubuntu.com/security/notices/USN-7800-1
- https://ubuntu.com/security/notices/USN-7801-1
- https://ubuntu.com/security/notices/USN-7801-2
- https://ubuntu.com/security/notices/USN-7801-3
- https://ubuntu.com/security/notices/USN-7802-1
- https://ubuntu.com/security/notices/USN-7809-1
- https://www.cve.org/CVERecord?id=CVE-2025-21980