Linux Kernel up to 7.2-rc2 qede qede_rx_build_skb/qede_tpa_rx_build_skb off-by-one

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.48

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.2-rc2. The impacted element is the function qede_rx_build_skb/qede_tpa_rx_build_skb of the component qede. This manipulation causes off-by-one. This vulnerability is tracked as CVE-2026-72339. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2-rc2. Affected by this vulnerability is the function qede_rx_build_skb/qede_tpa_rx_build_skb of the component qede. The manipulation with an unknown input leads to a off-by-one vulnerability. The CWE definition for the vulnerability is CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-72339 since 08/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc3 eliminates this vulnerability. Applying the patch ecc05d4b20220a09c9c69584fc46ca55248a374a/07be8b8adf91b7ada4c3dacce064d572a6066421/1624aa100c0b218181aa74e3696a389b509298cb/0bf78df2d3ecb1f4964ff42a7327d25845955153/814a5edac8c9fc04051808d5faaa93768e989281/b066420e57f3402a52c998678b4678252ac9bb63/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Off-by-one
CWE: CWE-193 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc3
Patch: ecc05d4b20220a09c9c69584fc46ca55248a374a/07be8b8adf91b7ada4c3dacce064d572a6066421/1624aa100c0b218181aa74e3696a389b509298cb/0bf78df2d3ecb1f4964ff42a7327d25845955153/814a5edac8c9fc04051808d5faaa93768e989281/b066420e57f3402a52c998678b4678252ac9bb63/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72339 (🔒)
GCVE (CVE): GCVE-0-2026-72339
GCVE (VulDB): GCVE-100-390727

Entryinfo

Created: 08/15/2026 14:29
Changes: 08/15/2026 14:29 (59)
Complete: 🔍
Cache ID: 216::103

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