CVE - CVE-2022-49626

CVE-ID
CVE-2022-49626	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: sfc: fix use after free when disabling sriov Use after free is detected by kfence when disabling sriov. What was read after being freed was vf->pci_dev: it was freed from pci_disable_sriov and later read in efx_ef10_sriov_free_vf_vports, called from efx_ef10_sriov_free_vf_vswitching. Set the pointer to NULL at release time to not trying to read it later. Reproducer and dmesg log (note that kfence doesn't detect it every time): $ echo 1 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs $ echo 0 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs BUG: KFENCE: use-after-free read in efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc] Use-after-free read at 0x00000000ff3c1ba5 (in kfence-#224): efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc] efx_ef10_pci_sriov_disable+0x38/0x70 [sfc] efx_pci_sriov_configure+0x24/0x40 [sfc] sriov_numvfs_store+0xfe/0x140 kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x11f/0x1b0 vfs_write+0x1eb/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x5c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae kfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k allocated by task 6771 on cpu 10 at 3137.860196s: pci_alloc_dev+0x21/0x60 pci_iov_add_virtfn+0x2a2/0x320 sriov_enable+0x212/0x3e0 efx_ef10_sriov_configure+0x67/0x80 [sfc] efx_pci_sriov_configure+0x24/0x40 [sfc] sriov_numvfs_store+0xba/0x140 kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x11f/0x1b0 vfs_write+0x1eb/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x5c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae freed by task 6771 on cpu 12 at 3170.991309s: device_release+0x34/0x90 kobject_cleanup+0x3a/0x130 pci_iov_remove_virtfn+0xd9/0x120 sriov_disable+0x30/0xe0 efx_ef10_pci_sriov_disable+0x57/0x70 [sfc] efx_pci_sriov_configure+0x24/0x40 [sfc] sriov_numvfs_store+0xfe/0x140 kernfs_fop_write_iter+0x11c/0x1b0 new_sync_write+0x11f/0x1b0 vfs_write+0x1eb/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x5c/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/3199e34912d84cdfb8a93a984c5ae5c73fb13e84 URL:https://git.kernel.org/stable/c/3199e34912d84cdfb8a93a984c5ae5c73fb13e84 MISC:https://git.kernel.org/stable/c/58d93e9d160c0de6d867c7eb4c2206671a351eb1 URL:https://git.kernel.org/stable/c/58d93e9d160c0de6d867c7eb4c2206671a351eb1 MISC:https://git.kernel.org/stable/c/9c854ae512b89229aeee93849e9bd4c115b37909 URL:https://git.kernel.org/stable/c/9c854ae512b89229aeee93849e9bd4c115b37909 MISC:https://git.kernel.org/stable/c/bcad880865bfb421885364b1f0c7351280fe2b97 URL:https://git.kernel.org/stable/c/bcad880865bfb421885364b1f0c7351280fe2b97 MISC:https://git.kernel.org/stable/c/c2240500817b3b4b996cdf2a461a3a5679f49b94 URL:https://git.kernel.org/stable/c/c2240500817b3b4b996cdf2a461a3a5679f49b94 MISC:https://git.kernel.org/stable/c/c9e75bb22a26e391f189f5a5133dd63dcb57fdaa URL:https://git.kernel.org/stable/c/c9e75bb22a26e391f189f5a5133dd63dcb57fdaa MISC:https://git.kernel.org/stable/c/e435c4aeeaa073091f7f3b7735af2ef5c97d63f2 URL:https://git.kernel.org/stable/c/e435c4aeeaa073091f7f3b7735af2ef5c97d63f2 MISC:https://git.kernel.org/stable/c/ebe41da5d47ac0fff877e57bd14c54dccf168827 URL:https://git.kernel.org/stable/c/ebe41da5d47ac0fff877e57bd14c54dccf168827
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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