CVE-2022-49626
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2022
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
sfc: fix use after free when disabling sriov
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
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | 3199e34912d84cdfb8a93a984c5ae5c73fb13e84 | Unavailable | None listed |
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | c9e75bb22a26e391f189f5a5133dd63dcb57fdaa | Unavailable | None listed |
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | 9c854ae512b89229aeee93849e9bd4c115b37909 | Unavailable | None listed |
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | bcad880865bfb421885364b1f0c7351280fe2b97 | Unavailable | None listed |
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | c2240500817b3b4b996cdf2a461a3a5679f49b94 | Unavailable | None listed |
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | 58d93e9d160c0de6d867c7eb4c2206671a351eb1 | Unavailable | None listed |
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | e435c4aeeaa073091f7f3b7735af2ef5c97d63f2 | Unavailable | None listed |
| 3c5eb87605e85146a78de589b5070a37862425db | affected | git | ebe41da5d47ac0fff877e57bd14c54dccf168827 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.2 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.2 | Unavailable | None listed |
| 4.9.324 | unaffected | semver | Unavailable | 4.9.* | None listed |
| 4.14.289 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.253 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.207 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.132 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.56 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 5.18.13 | unaffected | semver | Unavailable | 5.18.* | None listed |
| 5.19 | unaffected | original_commit_for_fix | Unavailable | * | None listed |