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NVD / CVE Program· CNA Linux

CVE-2026-46303: isofs: validate Rock Ridge CE continuation extent against volume size

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.32% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2.6.33, 22b36fa081f38ab397c7697f9d539211b51a0cfc, 3.11; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.

Low priority for now. Upgrade to Linux Linux 2.6.33, 22b36fa081f38ab397c7697f9d539211b51a0cfc, 3.11; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: isofs: validate Rock Ridge CE continuation extent against volume size rock_continue() reads rs->cont_extent verbatim from the Rock Ridge CE record and passes it to sb_bread() without checking that the block number is within the mounted ISO 9660 volume. commit e595447e177b ("[PATCH] rock.c: handle corrupted directories") added cont_offset and cont_size rejection for the CE continuation but did not validate the extent block number itself. commit f54e18f1b831 ("isofs: Fix infinite looping over CE entries") later capped the CE chain length at RR_MAX_CE_ENTRIES = 32 but again left the block number unchecked. With a crafted ISO mounted via udisks2 (desktop optical auto-mount) or via CAP_SYS_ADMIN mount, rs->cont_extent can therefore point at an out-of-range block or at blocks belonging to an adjacent filesystem on the same block device. sb_bread() on an out-of-range block returns NULL cleanly via the block layer EIO path, so there is no memory-safety violation. For in-range reads of adjacent- filesystem data, the CE buffer is parsed as Rock Ridge records and only the text of SL sub-records reaches userspace through readlink(), which makes the info-leak channel narrow and difficult to exploit; still, rejecting the malformed CE outright matches the rejection shape already present in the same function for cont_offset and cont_size. Add an ISOFS_SB(sb)->s_nzones bounds check to rock_continue() next to the existing offset/size rejection, printing the same corrupted-directory-entry notice.

HighCVSS 8.2 · v3.1—No exploit Fix available
Published
Jun 8, 2026
Updated
Oct 15, 2026
EPSS
0.3% · 25th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CNA vs NVD score

NVD
—
CNA · Linux
8.2
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.32.66 and later · before 2.6.33
  • linux linux kernel3.2.67 and later · before 3.3
  • linux linux kernel3.4.107 and later · before 3.5
  • linux linux kernel3.10.64 and later · before 3.11
  • linux linux kernel3.12.36 and later · before 3.13
  • linux linux kernel3.14.28 and later · before 3.15
  • linux linux kernel3.17.8 and later · before 3.18
  • linux linux kernel3.18.2 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.140
  • linux linux kernel6.7 and later · before 6.12.88
  • linux linux kernel6.13 and later · before 6.18.30
  • linux linux kernel6.19 and later · before 7.0.7
  • linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 08313e26e06d4aa9ce1cbba1a8e359e9cab9ad56, 212c4d33ca83e2144064fe9c2911607fbed5386f, 96e44adce250199ec9b2b928be66365779ff1b59, 1fe5620fcd6c2f0a4a927ee10c8e53196da392f3, fbce0d7dc8965c9fb8d411862040239d4a768c71, 8190393a88f2b0321263a54f2a9eb5a2aa43be7e, 486aa789eadcf44ed87f972b209299c516454693, b6d20edb6e7cedb4eedb9e0193d20dd488ebae84, 3.19affected
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before 8356fb821016797f5677cbeee5ddc0d32a95b4beaffected · git
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before d582e12378bc1637f337622feef762f53c43fd57affected · git
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before bf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9affected · git
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before c9b37c8b73f6368e4750e5ccb0632c380b43c6e5affected · git
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before 22b36fa081f38ab397c7697f9d539211b51a0cfcaffected · git
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before e69da8eeab74b4f4505024c38a17bce060fe7df8affected · git
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before ef048470c90bc8c1b8318bb2ce329da9ef64b9feaffected · git
    • f54e18f1b831c92f6512d2eedb224cd63d607d3d and later · before a36d990f591320e9dd379ab30063ebfe91d47e1faffected · git
    • 2.6.32.66 and later · before 2.6.33affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.42.1.el10_26.12.0-211.42.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-46298Jun 8, 2026 · pseries/papr-hvpipe: Fix race with interrupt handler
    18Monitor
  • ← EarlierCVE-2026-46302Jun 8, 2026 · selinux: allow multiple opens of /sys/fs/selinux/policy
    22Monitor
  • Later →CVE-2026-46304Jun 8, 2026 · nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2.6.33Vendor (CNA)
Linux Linux22b36fa081f38ab397c7697f9d539211b51a0cfcVendor (CNA)
Linux Linux3.11Vendor (CNA)
Linux Linux3.13Vendor (CNA)
Linux Linux3.15Vendor (CNA)
Linux Linux3.18Vendor (CNA)
Linux Linux3.19Vendor (CNA)
Linux Linux3.3Vendor (CNA)
Linux Linux3.5Vendor (CNA)
Linux Linux8356fb821016797f5677cbeee5ddc0d32a95b4beVendor (CNA)
Linux Linuxa36d990f591320e9dd379ab30063ebfe91d47e1fVendor (CNA)
Linux Linuxbf1bc673c587f5ef7e9c09b94aea7c5a7847d4d9Vendor (CNA)
Linux Linuxc9b37c8b73f6368e4750e5ccb0632c380b43c6e5Vendor (CNA)
Linux Linuxd582e12378bc1637f337622feef762f53c43fd57Vendor (CNA)
Linux Linuxe69da8eeab74b4f4505024c38a17bce060fe7df8Vendor (CNA)
Linux Linuxef048470c90bc8c1b8318bb2ce329da9ef64b9feVendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.42.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

+13

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records