High

CVE-2026-98524 — rds: ib: Clear the sg list when mapping an MR fails

In the Linux kernel, the following vulnerability has been resolved: rds: ib: Clear the sg list when mapping an MR fails rds_ib_map_frmr() stores the caller's scatterlist in the MR before DMA mapping and registration can fail. On failure, __rds_rdma_map() unpins the pages and frees the scatterlist, but rds_ib_free_frmr() can still return the MR to the pool with the stale pointer set. This leaves the pool with a dangling scatterlist and can lead to local privilege escalation. KASAN detects the resulting use-after-free when the MR is later torn down: BUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr Read of size 8 Call Trace: __rds_ib_teardown_mr rds_ib_unreg_frmr rds_ib_flush_mr_pool rds_ib_flush_mrs rds_free_mr rds_setsockopt Store the scatterlist in the MR only after DMA mapping succeeds. If DMA mapping fails, return directly while the MR fields remain clear; the caller keeps ownership of the scatterlist and its pinned pages. If a later registration step fails, unmap the scatterlist and clear the MR fields before returning.

Published Oct 18, 2026 · Updated Oct 24, 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
Technical severity (high)+6

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 7% of scored CVEs · Oct 30, 2026

Affects

Linux

CVSS base

7.8

High · 2 source(s)

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	≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < 1be3211e6ac77adbb1eac01314d989d243b32c59≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < c42d316163f89cd23de2f3e24558177a8c29bad8≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < 8dca3c81344532a7f05edb3d12f31f3009410a90≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < 49ba5ed0129906e0362c2e4b5e21c89b2a41e115≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < 4468df5bcdef959fd96494e9968f323561a45f4c≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < e2ee0616260080376123997488b5cf8a3870b8d9≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < b36d32f30c3f1e58e3a5ae79d0f52836a316b36e≥ 1659185fb4d0025835eb2058a141f0746c5cab00 and < 58eb1b3325edac42dc6df72c80962bd53a3c8ca7 and 1 more version 4.6	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.8	CVSS 3.1	High	1.8	5.9	416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
7.8	CVSS 3.1	High	—	—	Linux via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67)

EPSS over time FIRST

Oct 19, 2026 → Oct 30, 2026 · 12 reading(s) · max 0.22%

Detection

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

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
CVSS changed · 7.8
Oct 24, 2026 · NIST National Vulnerability Database
Record published
Oct 18, 2026
Affected products added · linux/linux
Oct 18, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 18, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 18, 2026 · NIST National Vulnerability Database
CVE published
Oct 18, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 18, 2026 – Oct 18, 2026

References

10 on the record

git.kernel.org/stable/c/4468df5bcdef959fd96494e9968f323561a45f4c
NIST National Vulnerability Database
github.com/advisories/GHSA-wq82-wxrv-wcj7
GitHub Security Advisories
git.kernel.org/stable/c/1be3211e6ac77adbb1eac01314d989d243b32c59
NIST National Vulnerability Database
git.kernel.org/stable/c/49ba5ed0129906e0362c2e4b5e21c89b2a41e115
NIST National Vulnerability Database
git.kernel.org/stable/c/58eb1b3325edac42dc6df72c80962bd53a3c8ca7
NIST National Vulnerability Database
git.kernel.org/stable/c/e2ee0616260080376123997488b5cf8a3870b8d9
NIST National Vulnerability Database
git.kernel.org/stable/c/c42d316163f89cd23de2f3e24558177a8c29bad8
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-98524
GitHub Security Advisories
git.kernel.org/stable/c/8dca3c81344532a7f05edb3d12f31f3009410a90
NIST National Vulnerability Database
git.kernel.org/stable/c/b36d32f30c3f1e58e3a5ae79d0f52836a316b36e
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

High CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 3d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 3d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 3d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 3d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 3d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 3d

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 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-2026-98524 is "rds: ib: Clear the sg list when mapping an MR fails", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. 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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