UBUNTU-CVE-2024-58093
In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Fix link state exit during switch upstream function removal Before 456d8aa37d0f ("PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free"), we would free the ASPM link only after the last function on the bus pertaining to the given link was removed. That was too late. If function 0 is removed before sibling function, link->downstream would point to free'd memory after. After above change, we freed the ASPM parent link state upon any function removal on the bus pertaining to a given link. That is too early. If the link is to a PCIe switch with MFD on the upstream port, then removing functions other than 0 first would free a link which still remains parent_link to the remaining downstream ports. The resulting GPFs are especially frequent during hot-unplug, because pciehp removes devices on the link bus in reverse order. On that switch, function 0 is the virtual P2P bridge to the internal bus. Free exactly when function 0 is removed -- before the parent link is obsolete, but after all subordinate links are gone. [kwilczynski: commit log]
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
39 explicit affected versions
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26 explicit affected versions
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6 explicit affected versions
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26 explicit affected versions
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14 explicit affected versions
29 explicit affected versions
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67 explicit affected versions
30 explicit affected versions
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23 explicit affected versions
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10 explicit affected versions
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68 explicit affected versions
10 explicit affected versions
26 explicit affected versions
25 explicit affected versions
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16 explicit affected versions
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13 explicit affected versions
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24 explicit affected versions
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55 explicit affected versions
14 explicit affected versions
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108 explicit affected versions
24 explicit affected versions
13 explicit affected versions
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5 explicit affected versions
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13 explicit affected versions
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13 explicit affected versions
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7 explicit affected versions
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4 explicit affected versions
10 explicit affected versions
12 explicit affected versions
15 explicit affected versions
95 explicit affected versions
68 explicit affected versions
42 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
15 explicit affected versions
10 explicit affected versions
37 explicit affected versions
5 explicit affected versions
13 explicit affected versions
21 explicit affected versions
10 explicit affected versions
42 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
21 explicit affected versions
7 explicit affected versions
68 explicit affected versions
7 explicit affected versions
4 explicit affected versions
57 explicit affected versions
1 explicit affected versions
1 explicit affected versions
66 explicit affected versions
56 explicit affected versions
56 explicit affected versions
13 explicit affected versions
43 explicit affected versions
63 explicit affected versions
105 explicit affected versions
10 explicit affected versions
8 explicit affected versions
26 explicit affected versions
75 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
109 explicit affected versions
21 explicit affected versions
57 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: PCI/ASPM: Fix link state exit during switch upstream function removal Before 456d8aa37d0f ("PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free"), we would free the ASPM link only after the last function on the bus pertaining to the given link was removed. That was too late. If function 0 is removed before sibling function, link->downstream would point to free'd memory after. After above change, we freed the ASPM parent link state upon any function removal on the bus pertaining to a given link. That is too early. If the link is to a PCIe switch with MFD on the upstream port, then removing functions other than 0 first would free a link which still remains parent_link to the remaining downstream ports. The resulting GPFs are especially frequent during hot-unplug, because pciehp removes devices on the link bus in reverse order. On that switch, function 0 is the virtual P2P bridge to the internal bus. Free exactly when function 0 is removed -- before the parent link is obsolete, but after all subordinate links are gone. [kwilczynski: commit log]
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/cbf937dcadfd571a434f8074d057b32cd14fbea5
- https://git.kernel.org/stable/c/cbf937dcadfd571a434f8074d057b32cd14fbea5
- https://ubuntu.com/security/CVE-2024-58093
- https://ubuntu.com/security/notices/USN-7585-1
- https://ubuntu.com/security/notices/USN-7585-2
- https://ubuntu.com/security/notices/USN-7585-3
- https://ubuntu.com/security/notices/USN-7585-4
- https://ubuntu.com/security/notices/USN-7585-5
- https://ubuntu.com/security/notices/USN-7585-6
- https://ubuntu.com/security/notices/USN-7585-7
- https://ubuntu.com/security/notices/USN-7591-1
- https://ubuntu.com/security/notices/USN-7591-2
- https://ubuntu.com/security/notices/USN-7591-3
- https://ubuntu.com/security/notices/USN-7591-4
- https://ubuntu.com/security/notices/USN-7591-5
- https://ubuntu.com/security/notices/USN-7591-6
- https://ubuntu.com/security/notices/USN-7592-1
- https://ubuntu.com/security/notices/USN-7593-1
- https://ubuntu.com/security/notices/USN-7594-1
- https://ubuntu.com/security/notices/USN-7594-2
- https://ubuntu.com/security/notices/USN-7594-3
- https://ubuntu.com/security/notices/USN-7597-1
- https://ubuntu.com/security/notices/USN-7597-2
- https://ubuntu.com/security/notices/USN-7598-1
- https://ubuntu.com/security/notices/USN-7602-1
- 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-7640-1
- https://ubuntu.com/security/notices/USN-7655-1
- https://ubuntu.com/security/notices/USN-7703-1
- https://ubuntu.com/security/notices/USN-7703-2
- https://ubuntu.com/security/notices/USN-7703-3
- https://ubuntu.com/security/notices/USN-7703-4
- https://ubuntu.com/security/notices/USN-7719-1
- https://ubuntu.com/security/notices/USN-7737-1
- https://www.cve.org/CVERecord?id=CVE-2024-58093