CVE-2026-72502
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
tcp: ipv6: clamp default adverting MSS to avoid GSO_BY_FRAGS (0xFFFF)
In the Linux kernel, the following vulnerability has been resolved: tcp: ipv6: clamp default adverting MSS to avoid GSO_BY_FRAGS (0xFFFF) When MTU is large, ip6_default_advmss() can return IPV6_MAXPLEN (65535). This is interpreted by TCP as mss_clamp, allowing the MSS to reach 65535. However, 0xFFFF is also used as a magic value GSO_BY_FRAGS in the kernel. If a TCP packet with gso_size=0xFFFF is passed to skb_segment(), it will be mistakenly treated as GSO_BY_FRAGS, leading to a NULL pointer dereference because local TCP packets do not use frag_list. Fix this by returning min(IPV6_MAXPLEN, GSO_BY_FRAGS - 1) (65534) from ip6_default_advmss() when MTU is large. Also update the stale comment in ip6_default_advmss() which suggested that IPV6_MAXPLEN is returned to mean "any MSS".
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | 560b33b434e922ef97f9ff23aa2e909ef7aacd5c | Unavailable | None listed |
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | 21f69ac1879bb970588d5e7c12a96e6542f7c1a7 | Unavailable | None listed |
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | c0db3dc2ac323b6c4b76adede3b355a9daa6dea8 | Unavailable | None listed |
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | 572fff10819dfc359298d1f774839e76a4d96f93 | Unavailable | None listed |
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | 8e6214a530c03e341dc1b0a846c8f2b716b3551a | Unavailable | None listed |
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | d774cdbda6634a78d0f2baf201ee5a8c57f3bc0e | Unavailable | None listed |
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | a210791f33345aa87187f7d7a9f3b9b7f4a28e6d | Unavailable | None listed |
| 3953c46c3ac7eef31a9935427371c6f54a22f1ba | affected | git | 2bf43d0e2e6a27d52a7d624e2d6b9116972e8a22 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.8 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.8 | Unavailable | None listed |
| 5.10.261 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.212 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.178 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.145 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.97 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.40 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.5 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |