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CVE

CVE-2026-52993

tipc: fix double-free in tipc_buf_append()
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CVE

CVE-2026-52993

tipc: fix double-free in tipc_buf_append()

In the Linux kernel, the following vulnerability has been resolved:

tipc: fix double-free in tipcbufappend()

tipcmsgvalidate() can potentially reallocate the skb it is validating,

freeing the old one.  In tipcbufappend(), it was being called with a

pointer to a local variable which was a copy of the caller's skb

pointer.

If the skb was reallocated and validation subsequently failed, the error

handling path would free the original skb pointer, which had already

been freed, leading to double-free.

Fix this by checking if head now points to a newly allocated reassembled

skb.  If it does, reassign *headbuf for later freeing operations.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9, https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3, https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778, https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6, https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0, https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b, https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a, https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52993.json, https://access.redhat.com/errata/RHSA-2026:45115, https://access.redhat.com/errata/RHSA-2026:45116, https://access.redhat.com/errata/RHSA-2026:47017, https://access.redhat.com/errata/RHSA-2026:49212, https://access.redhat.com/security/cve/CVE-2026-52993, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52993.json, https://nvd.nist.gov/vuln/detail/CVE-2026-52993, https://bugzilla.redhat.com/show_bug.cgi?id=2492437, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00368%
EPSS Percentile
0.30116%
Introduced Version
d618d09a68e4eed7a435beb2e355250f6f40664a,4.15.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a,5.10.258,5.15.209,6.1.175,6.6.141,6.12.91,6.18.33,7.0.10,0:4.18.0-553.147.1.el8_10,0:4.18.0-553.147.1.rt7.488.el8_10,6.1.176-1,5.10.259-1,6.1.176-1~deb11u1,6.12.94-1,4.15.0-257.269,4.15.0-1196.209,5.4.0-1162.173~18.04.1,4.15.0-1189.206,5.4.0-1165.174~18.04.1,5.4.0-234.254~18.04.1,5.4.0-1108.113~18.04.1,4.15.0-1178.183,4.15.0-1158.169,5.4.0-1145.158~18.04.1,5.4.0-234.254,5.4.0-1162.173,5.15.0-1112.119~20.04.1,5.4.0-1167.173,5.15.0-1117.126~20.04.1,5.15.0-1117.126~20.04.2,5.4.0-1121.128,5.4.0-1165.174,5.15.0-186.196~20.04.1,5.4.0-1108.113,5.15.0-1106.110~20.04.1,5.15.0-1107.113~20.04.1,5.4.0-1066.69,5.15.0-184.194~20.04.1,5.15.0-1064.66~20.04.1,5.4.0-1160.170,5.15.0-1109.115~20.04.1,5.4.0-1145.158,5.4.0-1080.84,6.8.0-136.136,6.8.0-1061.64,6.8.0-1063.71,6.8.0-1062.69,6.8.0-1064.72,6.8.0-1059.67,6.8.0-1046.50,7.0.0-28.28~24.04.1,6.8.0-1061.62,6.8.0-136.136.2,6.8.0-1059.62,7.0.0-1016.16~24.04.1,6.8.0-1059.62.1,6.8.0-1030.31,6.8.0-1058.61,6.8.0-1061.65,6.8.0-1033.34,5.15.0-186.196,5.15.0-1112.119,6.8.0-1061.64~22.04.1,5.15.0-1117.126,6.8.0-1063.71~22.04.1,6.8.0-1062.69~22.04.1,5.15.0-1112.122,6.8.0-1064.72~22.04.1,5.15.0-1108.114,5.15.0-1095.103,6.8.0-136.136~22.04.1,5.15.0-1106.110,6.8.0-1061.62~22.04.1,5.15.0-1107.113,5.15.0-1104.109,5.15.0-184.194,6.8.0-136.136.2~22.04.1,5.15.0-1107.108,6.8.0-1059.62~22.04.1,5.15.0-1064.66,5.15.0-1053.53,5.15.0-1109.115,6.8.0-1058.61~22.04.1,6.8.0-136.136~22.04.3,5.15.0-1075.79,0:5.14.0-687.33.1.el9_8,0:5.10.258-257.1041.amzn2,0:1.0-0.amzn2,1:6.18.33-63.124.amzn2023,1:1.0-0.amzn2023,1:6.1.175-219.357.amzn2023,1:6.12.92-122.166.amzn2023

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