CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
AI Score
Confidence
High
EPSS
Percentile
13.4%
In the Linux kernel, the following vulnerability has been resolved:
tcp: avoid too many retransmit packets
If a TCP socket is using TCP_USER_TIMEOUT, and the other peer
retracted its window to zero, tcp_retransmit_timer() can
retransmit a packet every two jiffies (2 ms for HZ=1000),
for about 4 minutes after TCP_USER_TIMEOUT has ‘expired’.
The fix is to make sure tcp_rtx_probe0_timed_out() takes
icsk->icsk_user_timeout into account.
Before blamed commit, the socket would not timeout after
icsk->icsk_user_timeout, but would use standard exponential
backoff for the retransmits.
Also worth noting that before commit e89688e3e978 (“net: tcp:
fix unexcepted socket die when snd_wnd is 0”), the issue
would last 2 minutes instead of 4.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/ipv4/tcp_timer.c"
],
"versions": [
{
"version": "b701a99e431d",
"lessThan": "7bb7670f92bf",
"status": "affected",
"versionType": "git"
},
{
"version": "b701a99e431d",
"lessThan": "d2346fca5bed",
"status": "affected",
"versionType": "git"
},
{
"version": "b701a99e431d",
"lessThan": "5d7e64d70a11",
"status": "affected",
"versionType": "git"
},
{
"version": "b701a99e431d",
"lessThan": "04317a2471c2",
"status": "affected",
"versionType": "git"
},
{
"version": "b701a99e431d",
"lessThan": "e113cddefa27",
"status": "affected",
"versionType": "git"
},
{
"version": "b701a99e431d",
"lessThan": "dfcdd7f89e40",
"status": "affected",
"versionType": "git"
},
{
"version": "b701a99e431d",
"lessThan": "66cb64a1d223",
"status": "affected",
"versionType": "git"
},
{
"version": "b701a99e431d",
"lessThan": "97a9063518f1",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/ipv4/tcp_timer.c"
],
"versions": [
{
"version": "4.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.19",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.318",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.280",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.222",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.163",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.100",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.41",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9.10",
"lessThanOrEqual": "6.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/04317a2471c2f637b4c49cbd0e9c0d04a519f570
git.kernel.org/stable/c/5d7e64d70a11d988553a08239c810a658e841982
git.kernel.org/stable/c/66cb64a1d2239cd0309f9b5038b05462570a5be1
git.kernel.org/stable/c/7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4
git.kernel.org/stable/c/97a9063518f198ec0adb2ecb89789de342bb8283
git.kernel.org/stable/c/d2346fca5bed130dc712f276ac63450201d52969
git.kernel.org/stable/c/dfcdd7f89e401d2c6616be90c76c2fac3fa98fde
git.kernel.org/stable/c/e113cddefa27bbf5a79f72387b8fbd432a61a466