CVE-2026-98969 (GCVE-0-2026-98969)
Vulnerability from cvelistv5 – Published: 2026-10-23 12:19 – Updated: 2026-10-23 12:19
VLAI
EPSS
VEX
Title
net/sched: em_text: reject unterminated algo before autoload
Summary
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
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d675c989ed2d4ba23dff615330b04371aea83534 , < 00bcc303000bac524d62eed054d77372b38ace0f
(git)
Affected: d675c989ed2d4ba23dff615330b04371aea83534 , < 22182f91c6703af6e9832cffe6d22b381031cb5a (git) Affected: d675c989ed2d4ba23dff615330b04371aea83534 , < 85e5512369d4fe6e5f2c43712d9f9e01d4ae8437 (git) Affected: d675c989ed2d4ba23dff615330b04371aea83534 , < b627c6ba20be20334338229b4820baacb9d96826 (git) Affected: d675c989ed2d4ba23dff615330b04371aea83534 , < c9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.13
Unaffected: 0 , < 2.6.13 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.11 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"net/sched/em_text.c"
],
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"version": "d675c989ed2d4ba23dff615330b04371aea83534",
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{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.13"
},
{
"lessThan": "2.6.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.18.57",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.113",
"versionStartIncluding": "2.6.13",
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{
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{
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{
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}
],
"negate": false,
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}
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: em_text: reject unterminated algo before autoload\n\nThis is a follow-up to commit 9c572a83037a (\"net/sched: fix potential\nstack infoleak in em_text_dump()\"), which zero-initialised the dump-side\nstruct. Sashiko pointed at a pre-existing bug that exposed the change-side\ninput-validation gap open.\n\nem_text_change() casts the raw netlink attribute payload to struct\ntcf_em_text and passes conf-\u003ealgo, a 16-byte array with no enforced NUL\nterminator, to textsearch_prepare(). On the TS_AUTOLOAD retry\ntextsearch_prepare() calls request_module(\"ts_%s\", algo); vsnprintf()\nwalks %s until it finds a NUL, so an algo[] with no NUL reads past the\narray into the adjacent struct fields and payload and feeds those bytes\nto the usermode helper command line. This is an out-of-bounds read and\na kernel memory disclosure.\n\nReject the attribute when no NUL exists within TC_EM_TEXT_ALGOSIZ bytes,\nmatching the check xt_string has had since 3ab720881b6e.\n\nConditions to recreate the bug:\n- CAP_NET_ADMIN on the target netns (namespace-local via unshare -Urn\n is enough)\n- install clsact on an interface, then add a basic filter with one text\n ematch whose algo[] is 16 bytes with no NUL (e.g. \"A\"*16) and\n pattern_len at least 1\n- the add fails with -ENOENT and the kernel invokes modprobe with a\n module name made of \"ts_\" plus the 16 bytes and the adjacent payload"
}
],
"providerMetadata": {
"dateUpdated": "2026-10-23T12:19:42.012Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/00bcc303000bac524d62eed054d77372b38ace0f"
},
{
"url": "https://git.kernel.org/stable/c/22182f91c6703af6e9832cffe6d22b381031cb5a"
},
{
"url": "https://git.kernel.org/stable/c/85e5512369d4fe6e5f2c43712d9f9e01d4ae8437"
},
{
"url": "https://git.kernel.org/stable/c/b627c6ba20be20334338229b4820baacb9d96826"
},
{
"url": "https://git.kernel.org/stable/c/c9728fcf2e7fb4a7a8d08ebd9524c3b02ae1a021"
}
],
"title": "net/sched: em_text: reject unterminated algo before autoload",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-98969",
"datePublished": "2026-10-23T12:19:42.012Z",
"dateReserved": "2026-09-25T10:25:14.383Z",
"dateUpdated": "2026-10-23T12:19:42.012Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"microsoft_vex": {
"current_release_date": "2026-10-24T01:10:21.000Z",
"cve": "CVE-2026-98969",
"id": "msrc_CVE-2026-98969",
"initial_release_date": "2026-10-24T01:10:21.000Z",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "net/sched: em_text: reject unterminated algo before autoload",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98969.json",
"version": "1"
},
"nvd": {
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],
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: em_text: reject unterminated algo before autoload\n\nThis is a follow-up to commit 9c572a83037a (\"net/sched: fix potential\nstack infoleak in em_text_dump()\"), which zero-initialised the dump-side\nstruct. Sashiko pointed at a pre-existing bug that exposed the change-side\ninput-validation gap open.\n\nem_text_change() casts the raw netlink attribute payload to struct\ntcf_em_text and passes conf-\u003ealgo, a 16-byte array with no enforced NUL\nterminator, to textsearch_prepare(). On the TS_AUTOLOAD retry\ntextsearch_prepare() calls request_module(\"ts_%s\", algo); vsnprintf()\nwalks %s until it finds a NUL, so an algo[] with no NUL reads past the\narray into the adjacent struct fields and payload and feeds those bytes\nto the usermode helper command line. This is an out-of-bounds read and\na kernel memory disclosure.\n\nReject the attribute when no NUL exists within TC_EM_TEXT_ALGOSIZ bytes,\nmatching the check xt_string has had since 3ab720881b6e.\n\nConditions to recreate the bug:\n- CAP_NET_ADMIN on the target netns (namespace-local via unshare -Urn\n is enough)\n- install clsact on an interface, then add a basic filter with one text\n ematch whose algo[] is 16 bytes with no NUL (e.g. \"A\"*16) and\n pattern_len at least 1\n- the add fails with -ENOENT and the kernel invokes modprobe with a\n module name made of \"ts_\" plus the 16 bytes and the adjacent payload"
}
],
"id": "CVE-2026-98969",
"lastModified": "2026-10-23T13:17:18.440",
"metrics": {},
"published": "2026-10-23T13:17:18.440",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/00bcc303000bac524d62eed054d77372b38ace0f"
},
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/22182f91c6703af6e9832cffe6d22b381031cb5a"
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{
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
}
}
}
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