7.8

CVE-2026-63816: linux

CVSS: 7.8v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-63816DEBIAN-CVE-2026-63816
Published 19-07-2026Last modified 17-08-2026
Open JSON

Vulnerability summary

CVE-2026-63816 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 16 · Related 15
MGASA-2026-0312OPENSUSE-SU-2026:11339-1USN-8726-1USN-8726-2USN-8726-3USN-8726-4

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE) - shrink - f2fs_gc - gc_data_segment - ra_data_block(cow_inode) - mapping = F2FS_I(inode)->atomic_inode->i_mapping : f2fs_is_cow_file(cow_inode) is true - f2fs_evict_inode(atomic_inode) - clear_inode_flag(fi->cow_inode, FI_COW_FILE) - F2FS_I(fi->cow_inode)->atomic_inode = NULL ... - truncate_inode_pages_final(atomic_inode) - f2fs_grab_cache_folio(mapping) : create folio in atomic_inode->mapping - clear_inode(atomic_inode) - BUG_ON(atomic_inode->i_data.nrpages) We need to add a reference on fi->atomic_inode before using its mapping field during garbage collection, otherwise, it will cause UAF issue.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu142 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.12.96-1 | < 7.1.3-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux1 product
  • linux≥ 3db1de0e582c358dd013f3703cd55b5fe4076436, < 7d3ae21783e5914c1761ac7d63f882d3d70800e9 | ≥ 3db1de0e582c358dd013f3703cd55b5fe4076436, < 56038756aae68312df00d4aa1d97e51ef3aca725 | ≥ 3db1de0e582c358dd013f3703cd55b5fe4076436, < a499f77c06050a28c897bdbd86cd2f0721ae0743 | ≥ 3db1de0e582c358dd013f3703cd55b5fe4076436, < a805fec35c201c59643ddcde713bce4051c8ee27 | ≥ 3db1de0e582c358dd013f3703cd55b5fe4076436, < e0288584baa5dc41df4a829a023c4c1b33fe53d7 | 6db52f1944417c2601182a591a704e2f119c5215 | ≥ 5.18.18, < 5.19 | 5.19

3 vendors · 145 products

References

23 links
Show all 23 references