7.8

CVE-2026-63814: linux

CVSS: 7.8v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-63814DEBIAN-CVE-2026-63814
Published 19-07-2026Last modified 17-08-2026
Open JSON

Vulnerability summary

CVE-2026-63814 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.1% 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 21 · Related 20
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: validate ACL entry sizes in f2fs_acl_from_disk() f2fs_acl_count() only validates the aggregate ACL xattr length. A malformed ACL can still place ACL_USER or ACL_GROUP in a slot that only contains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk() then reads entry->e_id before verifying that a full entry fits. Require a short entry before reading e_tag and e_perm, and require a full entry before reading e_id for ACL_USER and ACL_GROUP. Return -EFSCORRUPTED from these new truncated-entry checks, while keeping the pre-existing -EINVAL paths unchanged. Validation reproduced this kernel report: KASAN slab-out-of-bounds in __f2fs_get_acl+0x6fb/0x7e0 RIP: 0033:0x7f4b835ea7aa The buggy address belongs to the object at ffff888114589960 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 8-byte region [ffff888114589960, ffff888114589968) Read of size 4 Call trace: dump_stack_lvl+0x66/0xa0 (?:?) print_report+0xce/0x630 (?:?) __f2fs_get_acl+0x6fb/0x7e0 (fs/f2fs/acl.c:169) srso_alias_return_thunk+0x5/0xfbef5 (?:?) __virt_addr_valid+0x224/0x430 (?:?) kasan_report+0xe0/0x110 (?:?) __f2fs_get_acl+0x5/0x7e0 (fs/f2fs/acl.c:169) __get_acl+0x281/0x380 (?:?) vfs_get_acl+0x10b/0x190 (?:?) do_get_acl+0x2a/0x410 (?:?) do_get_acl+0x9/0x410 (?:?) do_getxattr+0xe8/0x260 (?:?) filename_getxattr+0xd1/0x140 (?:?) do_getname+0x2d/0x2d0 (?:?) path_getxattrat+0x16c/0x200 (?:?) lock_release+0xc8/0x290 (?:?) cgroup_update_frozen+0x9d/0x320 (?:?) lockdep_hardirqs_on_prepare+0xea/0x1a0 (?:?) trace_hardirqs_on+0x1a/0x170 (?:?) _raw_spin_unlock_irq+0x28/0x50 (?:?) do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)

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

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 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)
Debian1 product
  • linux< 6.1.177-1 | < 6.12.95-1 | < 7.1.3-1
Linux1 product
  • linux≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < 733cd8474e6d763d75ed96f3f2b98a25480cf2b9 | ≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < 4e2a96ec7236e248e706850568e0a925fd21b588 | ≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < 442ca20c54038e2400cf28aaa944cf1de2c8e65d | ≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < 1ddf3fd21c4c652f9cab5552515c04a166662306 | ≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < aba4f94ac1832c7299c33e1b4fe5f87eef6dc8f1 | ≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < ff83de56882cb8466184d322abece2589258ca56 | ≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < 5d8a39649947a4e86c8fbc682d7fc0041b8d109a | ≥ af48b85b8cd3fbb12c9b6759c16db6d69c0b03da, < c4810ada31e80cbe4011467c4f3b1e93f94134f3 | 3.8

3 vendors · 171 products

References

31 links
Show all 31 references