Answer in brief
CVE-2026-52998 records a High severity (CVSS 7.5) vulnerability in netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-52998 records a High severity (CVSS 7.5) vulnerability in netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <f4de0777e4554a7de19c920accde6319dd530782 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <c996a90f3071cf43683e5423da31aadbe002b8b4 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <edc806f9122961f0d3819f7c69c14cccde31f277 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <5d05de2f0928d81309a815ecc76d1a3ad72cbc16 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <95be653a76793856ff8b2d8bd82c2943c23f5ca8 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <79b90a96688e521771fa6ed3dc7864b76b8df293 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <83fc5dd63455a779ea2dd0f7ffee3c920919d80b || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <711987ba281fd806322a7cd244e98e2a81903114 | f4de0777e4554a7de19c920accde6319dd530782, c996a90f3071cf43683e5423da31aadbe002b8b4, edc806f9122961f0d3819f7c69c14cccde31f277, 5d05de2f0928d81309a815ecc76d1a3ad72cbc16, 95be653a76793856ff8b2d8bd82c2943c23f5ca8, 79b90a96688e521771fa6ed3dc7864b76b8df293, 83fc5dd63455a779ea2dd0f7ffee3c920919d80b, 711987ba281fd806322a7cd244e98e2a81903114 |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check The nf_osf_ttl() function accessed skb->dev to perform a local interface address lookup without verifying that the device pointer was valid. Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn't especially in modern environments with containers and virtual switching. Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <f4de0777e4554a7de19c920accde6319dd530782 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <c996a90f3071cf43683e5423da31aadbe002b8b4 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <edc806f9122961f0d3819f7c69c14cccde31f277 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <5d05de2f0928d81309a815ecc76d1a3ad72cbc16 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <95be653a76793856ff8b2d8bd82c2943c23f5ca8 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <79b90a96688e521771fa6ed3dc7864b76b8df293 || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <83fc5dd63455a779ea2dd0f7ffee3c920919d80b || >=11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 <711987ba281fd806322a7cd244e98e2a81903114 | f4de0777e4554a7de19c920accde6319dd530782, c996a90f3071cf43683e5423da31aadbe002b8b4, edc806f9122961f0d3819f7c69c14cccde31f277, 5d05de2f0928d81309a815ecc76d1a3ad72cbc16, 95be653a76793856ff8b2d8bd82c2943c23f5ca8, 79b90a96688e521771fa6ed3dc7864b76b8df293, 83fc5dd63455a779ea2dd0f7ffee3c920919d80b, 711987ba281fd806322a7cd244e98e2a81903114 |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 24, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check The nf_osf_ttl() function accessed skb->dev to perform a local interface address lookup without verifying that the device pointer was valid. Additionally, the implementation utilized an in_dev_for_each_ifa_rcu loop to match the packet source address against local interface addresses. It assumed that packets from the same subnet should not see a decrement on the initial TTL. A packet might appear it is from the same subnet but it actually isn't especially in modern environments with containers and virtual switching. Remove the device dereference and interface loop. Replace the logic with a switch statement that evaluates the TTL according to the ttl_check.
Quoted source text, attributed separately from HOL analysis.