CVE-2026-72339 (GCVE-0-2026-72339)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
EPSS
VEX
Title
qede: fix off-by-one in BD ring consumption on build_skb failure
Summary
In the Linux kernel, the following vulnerability has been resolved:
qede: fix off-by-one in BD ring consumption on build_skb failure
qede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a
NULL return from qede_build_skb(). When it returns NULL under memory
pressure, the functions still consume a BD from the ring before
returning NULL. The callers then recycle additional BDs, resulting in
one extra BD being consumed (off-by-one). This desynchronizes the BD
ring, which can corrupt DMA page reference counts and lead to SLUB
freelist corruption.
Commit 4e910dbe3650 ("qede: confirm skb is allocated before using")
added a NULL check inside qede_build_skb() to prevent a NULL pointer
dereference, but did not address the missing NULL checks in the
callers, making this off-by-one reachable.
Fix this by adding NULL checks for the return value of
qede_build_skb() in both qede_rx_build_skb() and
qede_tpa_rx_build_skb(), returning NULL immediately before any BD ring
manipulation.
Severity
9.8 (Critical)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8a8633978b842c88fbcfe00d4e5dde96048f630e , < ecc05d4b20220a09c9c69584fc46ca55248a374a
(git)
Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 07be8b8adf91b7ada4c3dacce064d572a6066421 (git) Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 1624aa100c0b218181aa74e3696a389b509298cb (git) Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 0bf78df2d3ecb1f4964ff42a7327d25845955153 (git) Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 814a5edac8c9fc04051808d5faaa93768e989281 (git) Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < b066420e57f3402a52c998678b4678252ac9bb63 (git) Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < 982d6d6bc059c5dff37a2201c2f08c14bcfcbd20 (git) Affected: 8a8633978b842c88fbcfe00d4e5dde96048f630e , < a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f (git) |
guessed | |
| Linux | Linux |
Affected:
4.18
Unaffected: 0 , < 4.18 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
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{
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"product": "Linux",
"programFiles": [
"drivers/net/ethernet/qlogic/qede/qede_fp.c"
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{
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},
{
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"version": "5.10.261",
"versionType": "semver"
},
{
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"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
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"version": "6.6.145",
"versionType": "semver"
},
{
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"version": "6.12.97",
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},
{
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"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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{
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},
{
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{
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nqede: fix off-by-one in BD ring consumption on build_skb failure\n\nqede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a\nNULL return from qede_build_skb(). When it returns NULL under memory\npressure, the functions still consume a BD from the ring before\nreturning NULL. The callers then recycle additional BDs, resulting in\none extra BD being consumed (off-by-one). This desynchronizes the BD\nring, which can corrupt DMA page reference counts and lead to SLUB\nfreelist corruption.\n\nCommit 4e910dbe3650 (\"qede: confirm skb is allocated before using\")\nadded a NULL check inside qede_build_skb() to prevent a NULL pointer\ndereference, but did not address the missing NULL checks in the\ncallers, making this off-by-one reachable.\n\nFix this by adding NULL checks for the return value of\nqede_build_skb() in both qede_rx_build_skb() and\nqede_tpa_rx_build_skb(), returning NULL immediately before any BD ring\nmanipulation."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The bug is in the qede NIC RX fastpath reached when remote Ethernet frames are received, hardware posts completion queue entries, and NAPI runs qede_poll() -\u003e qede_rx_int() -\u003e qede_rx_process_cqe()/qede_tpa_start() into qede_rx_build_skb() or qede_tpa_rx_build_skb().\nAC:L - An attacker can reliably trigger build_skb() NULL returns by flooding the interface with frames larger than rx_copybreak (256 bytes) to exhaust GFP_ATOMIC skb slab allocations, then the off-by-one BD consumption desynchronizes the ring without races or victim-specific state.\nPR:N - No local account, capability, or authentication is required; any unauthenticated remote host that can send IP/Ethernet traffic to a server using a Marvell/QLogic FastLinQ qede NIC can hit the vulnerable RX/TPA handlers.\nUI:N - Exploitation requires no victim interaction beyond normal network operation; packet reception, MSI-X interrupt handling, and NAPI polling process attacker-supplied frames automatically in kernel context.\nS:U - The flaw corrupts kernel heap metadata (DMA page refcounts and SLUB freelists) within the host kernel security boundary; it does not by itself cross VM, container, or IOMMU isolation boundaries.\nC:H - BD ring desynchronization corrupts DMA page reference counts and can corrupt SLUB freelists; this class of kernel heap corruption is exploitable for arbitrary kernel memory reads and information disclosure beyond a simple crash.\nI:H - SLUB freelist corruption from mismatched BD ring consumption enables arbitrary kernel memory writes and control-flow hijacking primitives, supporting local privilege escalation or arbitrary code execution in kernel context.\nA:H - Reference-count and SLUB corruption from the desynchronized BD ring can cause kernel BUG/oops/panic or a wedged RX datapath, resulting in complete loss of host availability on affected systems."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:42:57.907Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a"
},
{
"url": "https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421"
},
{
"url": "https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb"
},
{
"url": "https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153"
},
{
"url": "https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281"
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{
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{
"url": "https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f"
}
],
"title": "qede: fix off-by-one in BD ring consumption on build_skb failure",
"x_generator": {
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}
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"cveMetadata": {
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"cveId": "CVE-2026-72339",
"datePublished": "2026-08-15T05:55:46.480Z",
"dateReserved": "2026-08-09T03:40:39.920Z",
"dateUpdated": "2026-08-17T05:42:57.907Z",
"state": "PUBLISHED"
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"vulnerability-lookup:meta": {
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"date": "2026-10-11",
"epss": "0.00745",
"percentile": "0.53495"
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"nvd": {
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{
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{
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"product": "Linux",
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],
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{
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"versions": [
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{
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{
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"status": "unaffected",
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{
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"version": "5.15.212",
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{
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"version": "6.1.178",
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{
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},
{
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},
{
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"versionType": "semver"
},
{
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"version": "7.1.5",
"versionType": "semver"
},
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nqede: fix off-by-one in BD ring consumption on build_skb failure\n\nqede_rx_build_skb() and qede_tpa_rx_build_skb() do not check for a\nNULL return from qede_build_skb(). When it returns NULL under memory\npressure, the functions still consume a BD from the ring before\nreturning NULL. The callers then recycle additional BDs, resulting in\none extra BD being consumed (off-by-one). This desynchronizes the BD\nring, which can corrupt DMA page reference counts and lead to SLUB\nfreelist corruption.\n\nCommit 4e910dbe3650 (\"qede: confirm skb is allocated before using\")\nadded a NULL check inside qede_build_skb() to prevent a NULL pointer\ndereference, but did not address the missing NULL checks in the\ncallers, making this off-by-one reachable.\n\nFix this by adding NULL checks for the return value of\nqede_build_skb() in both qede_rx_build_skb() and\nqede_tpa_rx_build_skb(), returning NULL immediately before any BD ring\nmanipulation."
}
],
"id": "CVE-2026-72339",
"lastModified": "2026-08-17T06:18:37.623",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:22:07.150",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20"
},
{
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"url": "https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-01T10:29:53+00:00",
"cve": "CVE-2026-72339",
"id": "CVE-2026-72339",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "260",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: qede: fix off-by-one in BD ring consumption on build_skb failure",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72339.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-10-10T01:11:06Z",
"cve": "CVE-2026-72339",
"id": "CVE-2026-72339",
"initial_release_date": "2026-08-22T00:53:58Z",
"product_status:known_affected": "648",
"product_status:known_not_affected": "6",
"product_status:recommended": "272",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-72339",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72339.json",
"version": "11"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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