qede: fix off-by-one in BD ring consumption on build_skb failure
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-72339
- 2026-10-03 Alias added: GHSA-447g-7f2j-g4vp
- 2026-10-16 CVSS score changed · Red Hat
- 2026-10-16 CISA SSVC decision points changed
References
Other 8
- https://git.kernel.org/stable/c/ecc05d4b20220a09c9c69584fc46ca55248a374a
- https://git.kernel.org/stable/c/07be8b8adf91b7ada4c3dacce064d572a6066421
- https://git.kernel.org/stable/c/1624aa100c0b218181aa74e3696a389b509298cb
- https://git.kernel.org/stable/c/0bf78df2d3ecb1f4964ff42a7327d25845955153
- https://git.kernel.org/stable/c/814a5edac8c9fc04051808d5faaa93768e989281
- https://git.kernel.org/stable/c/b066420e57f3402a52c998678b4678252ac9bb63
- https://git.kernel.org/stable/c/982d6d6bc059c5dff37a2201c2f08c14bcfcbd20
- https://git.kernel.org/stable/c/a0a558ca7e75b49e71f8c545c30e8c005e6e4e2f
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Sources
- CVE-2026-72339 · CVE Program
- CVE-2026-72339 · NVD
- FIRST EPSS
- GHSA-447g-7f2j-g4vp · GitHub Advisory Database · CC BY 4.0
- CVE-2026-72339 · Red Hat security data · CC BY 4.0
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