CVE-2021-47236: net: cdc_eem: fix tx fixup skb leak
Vulnerability summary
CVE-2021-47236 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.7% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 7Timeline
- 21-05-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: net: cdc_eem: fix tx fixup skb leak when usbnet transmit a skb, eem fixup it in eem_tx_fixup(), if skb_copy_expand() failed, it return NULL, usbnet_start_xmit() will have no chance to free original skb. fix it by free orginal skb in eem_tx_fixup() first, then check skb clone status, if failed, return NULL to usbnet.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.23%
Chance of exploitation in the next 30 days
Percentile
14%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.23% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu86 products
- linuxAll versions (No fix recorded) | < 4.15.0-156.163 | < 5.4.0-81.91
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1111.118 | < 5.4.0-1055.58
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < f12554b0ff639e74612cc01b3b4a049e098d2d65 | ≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < 14184ec5c958b589ba934da7363a2877879204df | ≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < 1bcacd6088d61c0ac6a990d87975600a81f3247e | ≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < f4e6a7f19c82f39b1803e91c54718f0d7143767d | ≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < 81de2ed06df8b5451e050fe6a318af3263dbff3f | ≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < 05b2b9f7d24b5663d9b47427fe1555bdafd3ea02 | ≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < b4f7a9fc9d094c0c4a66f2ad7c37b1dbe9e78f88 | ≥ 9f722c0978b04acba209f8ca1896ad05814bc3a3, < c3b26fdf1b32f91c7a3bc743384b4a298ab53ad7 | 2.6.30
- linux_kernel≥ 2.6.30, < 4.4.274 | ≥ 4.5, < 4.9.274 | ≥ 4.10, < 4.14.238 | ≥ 4.15, < 4.19.196 | ≥ 4.20, < 5.4.128 | ≥ 5.5, < 5.10.46 | ≥ 5.11, < 5.12.13 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3 | 5.13:rc4 | 5.13:rc5 | 5.13:rc6
Debian1 product
- linux< 5.10.46-1
3 vendors · 89 products
