fsdax: Fix infinite loop in dax_iomap_rw()
Published Apr 28, 2024
6.2
MEDIUMCVSS 3.1
EPSS 0.23%
Description
I got an infinite loop and a WARNING report when executing a tail command in virtiofs.
WARNING: CPU: 10 PID: 964 at fs/iomap/iter.c:34 iomap_iter+0x3a2/0x3d0 Modules linked in: CPU: 10 PID: 964 Comm: tail Not tainted 5.19.0-rc7 Call Trace: <TASK> dax_iomap_rw+0xea/0x620 ? __this_cpu_preempt_check+0x13/0x20 fuse_dax_read_iter+0x47/0x80 fuse_file_read_iter+0xae/0xd0 new_sync_read+0xfe/0x180 ? 0xffffffff81000000 vfs_read+0x14d/0x1a0 ksys_read+0x6d/0xf0 __x64_sys_read+0x1a/0x20 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd
The tail command will call read() with a count of 0. In this case, iomap_iter() will report this WARNING, and always return 1 which casuing the infinite loop in dax_iomap_rw().
Fixing by checking count whether is 0 in dax_iomap_rw().
Affected products
-
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
-
- Version 5.15StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<5.15
- Version 5.15.71StatusunaffectedConstraints<=5.15.*
- Version 5.19.12StatusunaffectedConstraints<=5.19.*
- Version 6.0StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
- ≥ 5.15 · < 5.15.71
- ≥ 5.16 · < 5.19.12
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
-
- Version 5.15StatusaffectedConstraints-
- Version
-
- Version ca289e0b95afStatusaffectedConstraints<17d9c15c9b9e
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux Kernel | n/a |
| ||||||
| Linux | Linux Kernel | n/a |
|
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Out of support scope
Red Hat Enterprise Linux 7
kernel-rt
Out of support scope
Red Hat Enterprise Linux 8
kernel
Affected
Red Hat Enterprise Linux 8
kernel-rt
Fix deferred
Red Hat Enterprise Linux 9
kernel
Affected
Red Hat Enterprise Linux 9
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Out of support scope | n/a |
| Red Hat Enterprise Linux 8 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 14, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2024–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (5 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.23% (0.00234) | 13.00th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.23% (0.00234) | 14.03th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.02% (0.00017) | 2.29th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00045) | 17.70th | v3 (v2023.03.01) |
| Apr 29, 2024 | 0.04% (0.00045) | 14.19th | v3 (v2023.03.01) |
References (9)
- https://access.redhat.com/security/cve/CVE-2022-48635 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2277835 Issue Tracking
- https://git.kernel.org/stable/c/17d9c15c9b9e7fb285f7ac5367dfb5f00ff575e3 Patch
- https://git.kernel.org/stable/c/463f36137c40342fb03bba380c1bf703c40d89a6
- https://git.kernel.org/stable/c/60644dffac87b1bb47bdb393aa29d5f2ffcf41a0 Patch
- https://git.kernel.org/stable/c/929ef155e1da41c06f4d8ca86ae12b851a83a744 Patch
- https://lore.kernel.org/linux-cve-announce/2024042854-CVE-2022-48635-6286@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2022-48635
- https://www.cve.org/CVERecord?id=CVE-2022-48635
Change history (0)
No recorded changes yet.