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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98969: net/sched: em_text: reject unterminated algo before autoload

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 00bcc303000bac524d62eed054d77372b38ace0f, 22182f91c6703af6e9832cffe6d22b381031cb5a, 64153f1dd14dabfd4e79bf506bb5b5d66f7b42eb; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 00bcc303000bac524d62eed054d77372b38ace0f, 22182f91c6703af6e9832cffe6d22b381031cb5a, 64153f1dd14dabfd4e79bf506bb5b5d66f7b42eb; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 6.6.161.1-1 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: net/sched: em_text: reject unterminated algo before autoload This is a follow-up to commit 9c572a83037a ("net/sched: fix potential stack infoleak in em_text_dump()"), which zero-initialised the dump-side struct. Sashiko pointed at a pre-existing bug that exposed the change-side input-validation gap open. em_text_change() casts the raw netlink attribute payload to struct tcf_em_text and passes conf->algo, a 16-byte array with no enforced NUL terminator, to textsearch_prepare(). On the TS_AUTOLOAD retry textsearch_prepare() calls request_module("ts_%s", algo); vsnprintf() walks %s until it finds a NUL, so an algo[] with no NUL reads past the array into the adjacent struct fields and payload and feeds those bytes to the usermode helper command line. This is an out-of-bounds read and a kernel memory disclosure. Reject the attribute when no NUL exists within TC_EM_TEXT_ALGOSIZ bytes, matching the check xt_string has had since 3ab720881b6e. Conditions to recreate the bug: - CAP_NET_ADMIN on the target netns (namespace-local via unshare -Urn is enough) - install clsact on an interface, then add a basic filter with one text ematch whose algo[] is 16 bytes with no NUL (e.g. "A"*16) and pattern_len at least 1 - the add fails with -ENOENT and the kernel invokes modprobe with a module name made of "ts_" plus the 16 bytes and the adjacent payload

—No exploit Fix available
Published
Oct 23, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • 2.6.13affected
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before 64153f1dd14dabfd4e79bf506bb5b5d66f7b42ebaffected · git
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before b62fb105961b677418cbc0a0a8837a41735729ecaffected · git
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before b4da5c85cd701066ff429727fb61b84bde8bcce2affected · git
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before 00bcc303000bac524d62eed054d77372b38ace0faffected · git
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before 22182f91c6703af6e9832cffe6d22b381031cb5aaffected · git
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before 85e5512369d4fe6e5f2c43712d9f9e01d4ae8437affected · git
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before b627c6ba20be20334338229b4820baacb9d96826affected · git
    • d675c989ed2d4ba23dff615330b04371aea83534 and later · before c9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021affected · git
    • before 2.6.13not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.11-17.2.11-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98967Oct 23, 2026 · cxgb4/ch_ktls: disable softirqs around tid_list erases
    0Monitor
  • ← EarlierCVE-2026-98968Oct 23, 2026 · amt: send the relay's General Query directly from the receive path
    32Monitor
  • Later →CVE-2026-98970Oct 23, 2026 · drm/vc4: Free the BO cache size list on teardown
    0Monitor

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 Linux00bcc303000bac524d62eed054d77372b38ace0fVendor (CNA)
Linux Linux22182f91c6703af6e9832cffe6d22b381031cb5aVendor (CNA)
Linux Linux64153f1dd14dabfd4e79bf506bb5b5d66f7b42ebVendor (CNA)
Linux Linux85e5512369d4fe6e5f2c43712d9f9e01d4ae8437Vendor (CNA)
Linux Linuxb4da5c85cd701066ff429727fb61b84bde8bcce2Vendor (CNA)
Linux Linuxb627c6ba20be20334338229b4820baacb9d96826Vendor (CNA)
Linux Linuxb62fb105961b677418cbc0a0a8837a41735729ecVendor (CNA)
Linux Linuxc9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.06.6.161.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)

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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 9, 2026+17 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Exploit maturity— → none
  2. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records