CVE-2026-72339 (GCVE-0-2026-72339)
Vulnerability from cvelistv5
Published
2026-08-15 05:55
Modified
2026-08-17 05:42
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e Version: 8a8633978b842c88fbcfe00d4e5dde96048f630e |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/qlogic/qede/qede_fp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ecc05d4b20220a09c9c69584fc46ca55248a374a",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
},
{
"lessThan": "07be8b8adf91b7ada4c3dacce064d572a6066421",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
},
{
"lessThan": "1624aa100c0b218181aa74e3696a389b509298cb",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
},
{
"lessThan": "0bf78df2d3ecb1f4964ff42a7327d25845955153",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
},
{
"lessThan": "814a5edac8c9fc04051808d5faaa93768e989281",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
},
{
"lessThan": "b066420e57f3402a52c998678b4678252ac9bb63",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
},
{
"lessThan": "982d6d6bc059c5dff37a2201c2f08c14bcfcbd20",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
},
{
"lessThan": "a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f",
"status": "affected",
"version": "8a8633978b842c88fbcfe00d4e5dde96048f630e",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/qlogic/qede/qede_fp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"lessThan": "4.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"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": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "4.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.18",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": [
{
"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"
},
{
"url": "https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63"
},
{
"url": "https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20"
},
{
"url": "https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f"
}
],
"title": "qede: fix off-by-one in BD ring consumption on build_skb failure",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…