CVE-2026-63810: linux
Vulnerability summary
CVE-2026-63810 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 33 · Related 32Timeline
- 19-07-2026PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: block: Avoid mounting the bdev pseudo-filesystem in userspace The bdev pseudo-filesystem is an internal kernel filesystem with which userspace should not interfere. Unregister it so that userspace cannot even attempt to mount it. This fixes a bug [1] that occurs when attempting to access files, because the system call move_mount() uses pointers declared in the inode_operations structure, which for the bdev pseudo-filesystem are always equal to 0. `inode->i_op = &empty_iops;` [1] BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 23380067 P4D 23380067 PUD 23381067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN NOPTI CPU: 2 PID: 17125 Comm: syz-executor.0 Not tainted 6.1.155-syzkaller-00350-g84221fde2681 #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:0x0 Call Trace: <TASK> lookup_open.isra.0+0x700/0x1180 fs/namei.c:3460 open_last_lookups fs/namei.c:3550 [inline] path_openat+0x953/0x2700 fs/namei.c:3780 do_filp_open+0x1c5/0x410 fs/namei.c:3810 do_sys_openat2+0x171/0x4d0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x13c/0x1f0 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
CVSS metrics
Risk metrics not yet published.
EPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
10%
Versus all other CVEs
30-day change
+0.02 pp
From 0.19% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo 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< 6.1.180-1 | < 6.12.95-1 | < 7.1.3-1
Linux1 product
- linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3d3fcf23993bb756de2f912ab631cfdcc4746554 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 99cde0a7b1e98fd3970aabef1300918e91698dd5 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1a02a5028bd6dead1f8503854ef3168d651cd417 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 197971e6ffc0a6356b2ba2b22beb42bc0f7e412d | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3804e6de30ae7b053d53341d9d6944356cf23b40 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 717f721eb67d2dacd3ed5f7495aef2f442e84ce4 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f73aa66dffcb8e61e78f01b56163ec16a15d06d2 | 2.6.12
3 vendors · 171 products
