CVE-2022-49626

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Source
https://cve.org/CVERecord?id=CVE-2022-49626
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49626.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-49626
Downstream
Related
Published
2025-02-26T02:23:41.274Z
Modified
2026-03-20T12:24:41.402493Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
sfc: fix use after free when disabling sriov
Details

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->pcidev: it was freed from pcidisablesriov and later read in efxef10sriovfreevfvports, called from efxef10sriovfreevf_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/sriovnumvfs $ echo 0 > /sys/class/net/enp65s0f0np0/device/sriovnumvfs

BUG: KFENCE: use-after-free read in efxef10sriovfreevf_vswitching+0x82/0x170 [sfc]

Use-after-free read at 0x00000000ff3c1ba5 (in kfence-#224): efxef10sriovfreevfvswitching+0x82/0x170 [sfc] efxef10pcisriovdisable+0x38/0x70 [sfc] efxpcisriovconfigure+0x24/0x40 [sfc] sriovnumvfsstore+0xfe/0x140 kernfsfopwriteiter+0x11c/0x1b0 newsyncwrite+0x11f/0x1b0 vfswrite+0x1eb/0x280 ksyswrite+0x5f/0xe0 dosyscall64+0x5c/0x80 entrySYSCALL64after_hwframe+0x44/0xae

kfence-#224: 0x00000000edb8ef95-0x00000000671f5ce1, size=2792, cache=kmalloc-4k

allocated by task 6771 on cpu 10 at 3137.860196s: pciallocdev+0x21/0x60 pciiovaddvirtfn+0x2a2/0x320 sriovenable+0x212/0x3e0 efxef10sriovconfigure+0x67/0x80 [sfc] efxpcisriovconfigure+0x24/0x40 [sfc] sriovnumvfsstore+0xba/0x140 kernfsfopwriteiter+0x11c/0x1b0 newsyncwrite+0x11f/0x1b0 vfswrite+0x1eb/0x280 ksyswrite+0x5f/0xe0 dosyscall64+0x5c/0x80 entrySYSCALL64after_hwframe+0x44/0xae

freed by task 6771 on cpu 12 at 3170.991309s: devicerelease+0x34/0x90 kobjectcleanup+0x3a/0x130 pciiovremovevirtfn+0xd9/0x120 sriovdisable+0x30/0xe0 efxef10pcisriovdisable+0x57/0x70 [sfc] efxpcisriovconfigure+0x24/0x40 [sfc] sriovnumvfsstore+0xfe/0x140 kernfsfopwriteiter+0x11c/0x1b0 newsyncwrite+0x11f/0x1b0 vfswrite+0x1eb/0x280 ksyswrite+0x5f/0xe0 dosyscall64+0x5c/0x80 entrySYSCALL64afterhwframe+0x44/0xae

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49626.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3c5eb87605e85146a78de589b5070a37862425db
Fixed
3199e34912d84cdfb8a93a984c5ae5c73fb13e84
Fixed
c9e75bb22a26e391f189f5a5133dd63dcb57fdaa
Fixed
9c854ae512b89229aeee93849e9bd4c115b37909
Fixed
bcad880865bfb421885364b1f0c7351280fe2b97
Fixed
c2240500817b3b4b996cdf2a461a3a5679f49b94
Fixed
58d93e9d160c0de6d867c7eb4c2206671a351eb1
Fixed
e435c4aeeaa073091f7f3b7735af2ef5c97d63f2
Fixed
ebe41da5d47ac0fff877e57bd14c54dccf168827

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49626.json"