发布于3月6日3月6日 Members Ubuntu: (CVE-2021-47333): linux vulnerability Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/21/2024 Created 11/21/2024 Added 11/19/2024 Modified 02/11/2025 Description In the Linux kernel, the following vulnerability has been resolved: misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge There is an issue with the ASPM(optional) capability checking function. A device might be attached to root complex directly, in this case, bus->self(bridge) will be NULL, thus priv->parent_pdev is NULL. Since alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's ASPM capability and populate parent_cap_off, which will be used later by alcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do here is to avoid checking the capability if we are on the root complex. This will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply return when bring called, effectively disable ASPM for the device. [1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0 [1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40 [1.253998] Call Trace: [1.254131]? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci] [1.254476]alcor_pci_probe+0x169/0x2d5 [alcor_pci] Solution(s) ubuntu-upgrade-linux ubuntu-upgrade-linux-aws ubuntu-upgrade-linux-aws-5-4 ubuntu-upgrade-linux-aws-fips ubuntu-upgrade-linux-azure ubuntu-upgrade-linux-azure-5-4 ubuntu-upgrade-linux-azure-fips ubuntu-upgrade-linux-bluefield ubuntu-upgrade-linux-fips ubuntu-upgrade-linux-gcp ubuntu-upgrade-linux-gcp-5-4 ubuntu-upgrade-linux-gcp-fips ubuntu-upgrade-linux-gkeop ubuntu-upgrade-linux-hwe-5-4 ubuntu-upgrade-linux-ibm ubuntu-upgrade-linux-kvm ubuntu-upgrade-linux-oracle ubuntu-upgrade-linux-oracle-5-4 ubuntu-upgrade-linux-raspi ubuntu-upgrade-linux-raspi-5-4 References https://attackerkb.com/topics/cve-2021-47333 CVE - 2021-47333 https://git.kernel.org/linus/3ce3e45cc333da707d4d6eb433574b990bcc26f5 https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5 https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309 https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174 https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb https://www.cve.org/CVERecord?id=CVE-2021-47333 View more
