9.8

CVE-2026-68127: linux Use After Free

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-68127DEBIAN-CVE-2026-68127
Published 10-08-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-68127 is a critical (CVSS 9.8) Use After Free vulnerability in linux. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.54%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 28 · Related 26
MGASA-2026-0336MGASA-2026-0337OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1

Timeline

  1. 10-08-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ila: reload IPv6 header after pskb_may_pull in checksum adjust ila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling pskb_may_pull(). On a non-linear skb whose transport header sits in a page fragment, pskb_may_pull() can call __pskb_pull_tail() / pskb_expand_head() and free the old skb head, leaving ip6h dangling; the following get_csum_diff(ip6h, p) then reads freed memory. ila_update_ipv6_locator() uses ip6h (and the iaddr derived from it) again after the csum-adjust call and additionally writes the new locator through that pointer. Impact: a remote IPv6 packet routed through a configured ILA csum-adjust-transport route or receive-side mapping triggers a slab-use-after-free in ila_update_ipv6_locator() (KASAN). The route or mapping requires CAP_NET_ADMIN to configure, but trigger packets are unauthenticated once it exists. Reload ip6h after each pskb_may_pull() in ila_csum_adjust_transport() before the csum-diff read. In ila_update_ipv6_locator() only the ILA_CSUM_ADJUST_TRANSPORT case pulls the skb, so reload ip6h and iaddr in that case alone before the destination-address write; the neutral-map modes never pull and keep their cached pointers.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

-0.01 pp

From 0.54% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.54%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
  • linux-6.12< 6.12.101-1~deb12u1
Linux1 product
  • linux≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < e451a904606c571f731ef7a06b3398619dce5300 | ≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < 1eadcb43893b897ade85ac5bf5c618054bc3c655 | ≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < ba353caafb06ccee57b78d3254e3cebf1dea4a93 | ≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < 896a9512d0d83c2a4b357e5585b7b62a8e3f95c1 | ≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < 7097a0280b178237265681be66d1bef11d15894b | ≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < 472aba2603ca74c4f7722cb0c0296942b0776b8d | ≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc | ≥ 33f11d16142b06588eedfc1dd8cf93790979a712, < 92d3817649df2b0b6a008a686c8275c88d7ef594 | 4.5

3 vendors · 171 products

References

27 links
Show all 27 references