CVE-2022-49076: linux Use After Free
Vulnerability summary
CVE-2022-49076 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 26-02-2025PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/hfi1: Fix use-after-free bug for mm struct Under certain conditions, such as MPI_Abort, the hfi1 cleanup code may represent the last reference held on the task mm. hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed before the final use in hfi1_release_user_pages(). A new task may allocate the mm structure while it is still being used, resulting in problems. One manifestation is corruption of the mmap_sem counter leading to a hang in down_write(). Another is corruption of an mm struct that is in use by another task.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
17%
Versus all other CVEs
30-day change
0.00 pp
From 0.26% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu89 products
- linux< 5.15.0-37.39
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1011.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 3d2a9d642512c21a12d19b9250e7a835dcb41a79, < 5f54364ff6cfcd14cddf5441c4a490bb28dd69f7 | ≥ 3d2a9d642512c21a12d19b9250e7a835dcb41a79, < 9ca11bd8222a612de0d2f54d050bfcf61ae2883f | ≥ 3d2a9d642512c21a12d19b9250e7a835dcb41a79, < 0b7186d657ee55e2cdefae498f07d5c1961e8023 | ≥ 3d2a9d642512c21a12d19b9250e7a835dcb41a79, < 5a9a1b24ddb510715f8f621263938186579a965c | ≥ 3d2a9d642512c21a12d19b9250e7a835dcb41a79, < 2bbac98d0930e8161b1957dc0ec99de39ade1b3c | 5732f83596f8a573f2cde814cc76a54e1a8995c7 | ≥ 5.9.12, < 5.10 | 5.10
- linux_kernel≥ 5.9.12, < 5.10.111 | ≥ 5.11, < 5.15.34 | ≥ 5.16, < 5.16.20 | ≥ 5.17, < 5.17.3 | 5.18:rc1
Debian1 product
- linux< 5.17.3-1
3 vendors · 92 products
