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
2026-04-11T12:44:18.768945Z
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 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49626.json",
    "cna_assigner": "Linux"
}
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"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.2.0
Fixed
4.9.324
Type
ECOSYSTEM
Events
Introduced
4.10.0
Fixed
4.14.289
Type
ECOSYSTEM
Events
Introduced
4.15.0
Fixed
4.19.253
Type
ECOSYSTEM
Events
Introduced
4.20.0
Fixed
5.4.207
Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
5.10.132
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.56
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
5.18.13

Database specific

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