net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 33 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc As described in Gerrard's report [1], we have a UAF case when an hfsc class has a netem child qdisc. The crux of the issue is that hfsc is assuming that checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted the class in the vttree or eltree (which is not true for the netem duplicate case). This patch checks the n_active class variable to make sure that the code won't insert the class in the vttree or eltree twice, catering for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.0 and later | 5.4.294, 5.10.238, 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15 | Patch available | CNA |
- Linux VendorLinux Affected 5.0 and later Fixed in 5.4.294, 5.10.238, 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15 Patch available CNA
CPE configurations NVD · 13
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.0.1 to before 5.4.294; 5.5 to before 5.10.238; 5.11 to before 5.15.182; 5.16 to before 6.1.138; 6.2 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.0:-:*:*:*:*:*:* | 5.0 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.0:rc3:*:*:*:*:*:* | 5.0 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.0:rc4:*:*:*:*:*:* | 5.0 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.0:rc5:*:*:*:*:*:* | 5.0 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.0:rc6:*:*:*:*:*:* | 5.0 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.0:rc7:*:*:*:*:*:* | 5.0 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.0:rc8:*:*:*:*:*:* | 5.0 rc8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* | 6.15 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:* | 6.15 rc2 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.0.1 to before 5.4.294; 5.5 to before 5.10.238; 5.11 to before 5.15.182; 5.16 to before 6.1.138; 6.2 to before 6.6.90; 6.7 to before 6.12.28; 6.13 to before 6.14.6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.0:-:*:*:*:*:*:* Versions 5.0 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.0:rc3:*:*:*:*:*:* Versions 5.0 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.0:rc4:*:*:*:*:*:* Versions 5.0 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.0:rc5:*:*:*:*:*:* Versions 5.0 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.0:rc6:*:*:*:*:*:* Versions 5.0 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.0:rc7:*:*:*:*:*:* Versions 5.0 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.0:rc8:*:*:*:*:*:* Versions 5.0 rc8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* Versions 6.15 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:* Versions 6.15 rc2 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.4.294, 5.10.238, 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6, 6.15
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Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.9.4) | Fixed | RHSA-2025:13135 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2025:12746 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2025:14744 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2025:12209 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2025:13135 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:12752, RHSA-2025:16582 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2025:12746, RHSA-2025:16538 |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:14742 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2025:15035 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2025:14692 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2025:14692, RHSA-2025:16580 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2025:14511, RHSA-2025:16583 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2025:14744, RHSA-2025:16541 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2025:12209, RHSA-2025:16539 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.4) | Fixed | RHSA-2025:13135, RHSA-2025:16540 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2025:15035 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2025:14692 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2025:14511 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2025:12752 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2025:12746 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2025:12753 |
| Red Hat Enterprise Linux NFV E4S (v.9.0) | Fixed | RHSA-2025:14749 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2025:12753 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2025:12746 |
| Red Hat Enterprise Linux Real Time E4S (v.9.0) | Fixed | RHSA-2025:14749 |
| Red Hat Enterprise Linux Real Time EUS (v.9.4) | Fixed | RHSA-2025:13135 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2025:12662 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2025:12746 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) | Fixed | RHSA-2025:13135 |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2025-37890
- 2026-10-03 Alias added: GHSA-fwvg-7877-39cm
References
Patch 8
- https://git.kernel.org/stable/c/273bbcfa53541cde38b2003ad88a59b770306421
- https://git.kernel.org/stable/c/e0cf8ee23e1915431f262a7b2dee0c7a7d699af0
- https://git.kernel.org/stable/c/e3e949a39a91d1f829a4890e7dfe9417ac72e4d0
- https://git.kernel.org/stable/c/8df7d37d626430035b413b97cee18396b3450bef
- https://git.kernel.org/stable/c/6082a87af4c52f58150d40dec1716011d871ac21
- https://git.kernel.org/stable/c/2e7093c7a8aba5d4f8809f271488e5babe75e202
- https://git.kernel.org/stable/c/ac39fd4a757584d78ed062d4f6fd913f83bd98b5
- https://git.kernel.org/stable/c/141d34391abbb315d68556b7c67ad97885407547
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Sources
- CVE-2025-37890 · CVE Program
- CVE-2025-37890 · NVD
- FIRST EPSS
- GHSA-fwvg-7877-39cm · GitHub Advisory Database · CC BY 4.0
- CVE-2025-37890 · Red Hat security data · CC BY 4.0
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