Unknown

CVE-2026-98985 — namespace: check the mounts before reading their parents in pivot_root()

In the Linux kernel, the following vulnerability has been resolved: namespace: check the mounts before reading their parents in pivot_root() path_pivot_root() reads the parents of new_root and of the caller's root and checks whether they are shared before it checks that either mount is in the caller's mount namespace. Only namespace_sem is held. That's fine for a mount that is in the caller's mount namespace. But new_root can be a file descriptor to a mount that has been unmounted and that only the file descriptor keeps alive. If that mount stayed attached to its parent when it was unmounted nothing pins the parent for it. The final mntput() of the parent unhooks the children under mount_lock alone and frees the parent afterwards: pivot_root() close(fd), last ref on the parent ------------ --------------------------------- ex_parent = new_mnt->mnt_parent mntput_no_expire_slowpath() __umount_mnt(new_mnt) cleanup_mnt() call_rcu() IS_MNT_SHARED(ex_parent) BUG: KASAN: slab-use-after-free in path_pivot_root+0xf1a/0x1840 Read of size 4 at addr ffff8881047382f8 by task pivot_widen/157 path_pivot_root+0xf1a/0x1840 __x64_sys_pivot_root+0x165/0x190 The same goes for the caller's root via chroot(). Both outcomes of the check end in EINVAL so nothing but the read itself goes wrong. It's the same thing commit bb4609405752 ("statmount: read the parent of an unmounted mount under mount_lock") fixed for statmount(). Check that both mounts are in the caller's namespace before their parents are read. Every path returns EINVAL either way.

Published Oct 23, 2026 · Updated Oct 30, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.17%

ahead of 6% of scored CVEs · Oct 30, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < a56d4f8f8f4c5d9ac339d5c03a9d90eecd3697fc≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < 3c2441e21c3df867e4131e0ff784ecdb3a7a55f8≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < e3aba6900483f64e6c9eb328150dd633b7d36c1c≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < 3dad2330c89343ba083cf7868779083fd5fbe0fe≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < 6b7c001eb5857fa09041f47673666060a2e5fc1cversion 84b78514033ff22c443473214ab6d0508394cf7a≥ 4.0.2 and < 4.1version 4.1 and 3 more ≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < 43fd2e2ec66e6db26b6ea3e9e7a4c1018455e1b0≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < 5b5f8d0895cfa9f781ce107225d578897203444f≥ e0c9c0afd2fc958ffa34b697972721d81df8a56f and < 3184a2fda996af8fcd6def36020ec023c6279015	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 24, 2026 → Oct 30, 2026 · 7 reading(s) · max 0.21%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Affected products added · linux/linux
Oct 30, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 23, 2026
Affected products added · linux/linux
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 23, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 23, 2026 · Alertas do Telegram
CVE published
Oct 23, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

3× References added · Oct 23, 2026 – Oct 30, 2026
1× Official description updated · Oct 23, 2026 – Oct 23, 2026

References

10 on the record

git.kernel.org/stable/c/6b7c001eb5857fa09041f47673666060a2e5fc1c
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-98985
GitHub Security Advisories
git.kernel.org/stable/c/3184a2fda996af8fcd6def36020ec023c6279015
CVE Program (cve.org) e CISA ADP
github.com/advisories/GHSA-gfp5-4w3q-vwjx
GitHub Security Advisories
git.kernel.org/stable/c/43fd2e2ec66e6db26b6ea3e9e7a4c1018455e1b0
CVE Program (cve.org) e CISA ADP
git.kernel.org/stable/c/3dad2330c89343ba083cf7868779083fd5fbe0fe
NIST National Vulnerability Database
git.kernel.org/stable/c/e3aba6900483f64e6c9eb328150dd633b7d36c1c
NIST National Vulnerability Database
git.kernel.org/stable/c/a56d4f8f8f4c5d9ac339d5c03a9d90eecd3697fc
NIST National Vulnerability Database
git.kernel.org/stable/c/3c2441e21c3df867e4131e0ff784ecdb3a7a55f8
NIST National Vulnerability Database
git.kernel.org/stable/c/5b5f8d0895cfa9f781ce107225d578897203444f
CVE Program (cve.org) e CISA ADP

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 2d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 2d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 2d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 2d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 2d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-98985 is "namespace: check the mounts before reading their parents in pivot_root()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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