{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-49626", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49626", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-02-26T02:23:41.274Z", "updatedAt": "2026-05-11T19:03:34.174Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "sfc: fix use after free when disabling sriov", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix use after free when disabling sriov\n\nUse after free is detected by kfence when disabling sriov. What was read\nafter being freed was vf->pci_dev: it was freed from pci_disable_sriov\nand later read in efx_ef10_sriov_free_vf_vports, called from\nefx_ef10_sriov_free_vf_vswitching.\n\nSet the pointer to NULL at release time to not trying to read it later.\n\nReproducer and dmesg log (note that kfence doesn't detect it every time):\n$ echo 1 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\n$ echo 0 > /sys/class/net/enp65s0f0np0/device/sriov_numvfs\n\n BUG: KFENCE: use-after-free read in efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\n\n Use-after-free read at 0x00000000ff3c1ba5 (in kfence-#224):\n efx_ef10_sriov_free_vf_vswitching+0x82/0x170 [sfc]\n efx_ef10_pci_sriov_disable+0x38/0x70 [sfc]\n efx_pci_sriov_configure+0x24/0x40 [sfc]\n sriov_numvfs_store+0xfe/0x140\n kernfs_fop_write_iter+0x11c/0x1b0\n new_sync_write+0x11f/0x1b0\n vfs_write+0x1eb/0x280\n ksys_write+0x5f/0xe0\n do_syscall_64+0x5c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n kfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k\n\n allocated by task 6771 on cpu 10 at 3137.860196s:\n pci_alloc_dev+0x21/0x60\n pci_iov_add_virtfn+0x2a2/0x320\n sriov_enable+0x212/0x3e0\n efx_ef10_sriov_configure+0x67/0x80 [sfc]\n efx_pci_sriov_configure+0x24/0x40 [sfc]\n sriov_numvfs_store+0xba/0x140\n kernfs_fop_write_iter+0x11c/0x1b0\n new_sync_write+0x11f/0x1b0\n vfs_write+0x1eb/0x280\n ksys_write+0x5f/0xe0\n do_syscall_64+0x5c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n freed by task 6771 on cpu 12 at 3170.991309s:\n device_release+0x34/0x90\n kobject_cleanup+0x3a/0x130\n pci_iov_remove_virtfn+0xd9/0x120\n sriov_disable+0x30/0xe0\n efx_ef10_pci_sriov_disable+0x57/0x70 [sfc]\n efx_pci_sriov_configure+0x24/0x40 [sfc]\n sriov_numvfs_store+0xfe/0x140\n kernfs_fop_write_iter+0x11c/0x1b0\n new_sync_write+0x11f/0x1b0\n vfs_write+0x1eb/0x280\n ksys_write+0x5f/0xe0\n do_syscall_64+0x5c/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xae", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "3199e34912d84cdfb8a93a984c5ae5c73fb13e84" }, { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "c9e75bb22a26e391f189f5a5133dd63dcb57fdaa" }, { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "9c854ae512b89229aeee93849e9bd4c115b37909" }, { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "bcad880865bfb421885364b1f0c7351280fe2b97" }, { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "c2240500817b3b4b996cdf2a461a3a5679f49b94" }, { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "58d93e9d160c0de6d867c7eb4c2206671a351eb1" }, { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "e435c4aeeaa073091f7f3b7735af2ef5c97d63f2" }, { "version": "3c5eb87605e85146a78de589b5070a37862425db", "status": "affected", "versionType": "git", "lessThan": "ebe41da5d47ac0fff877e57bd14c54dccf168827" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.2", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.2" }, { "version": "4.9.324", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.289", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.253", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.207", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.132", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.56", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.18.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.18.*" }, { "version": "5.19", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }